CB 1142.3-1985 Technical requirements for marine hydraulic two-way cartridge valves
Some standard content:
China State Shipbuilding Corporation Department Standards
CB1142.1~1142.385
Graphic symbols, basic parameters and model compilation methods, technical conditions for marine hydraulic two-way cartridge valves Published on 1985-11-28
China State Shipbuilding Corporation
Implementation on 1986-11-15
China State Shipbuilding Corporation Department Standards
Technical conditions for marine hydraulic two-way cartridge valves
CB1142.8-85
Dimension: 57
This standard applies to marine two-way cartridge valves that use hydraulic fluid as the working medium and adopt GB2877--81 "Cartridge hydraulic valve installation hole connection dimensions". This standard specifies the technical requirements and test methods for marine two-way cartridge valves. 1 Technical requirements
1.1 General requirements
The general design, material and structural technical conditions of the one-way cartridge valve shall comply with the provisions of Chapter 3 of CB1015-82 "Technical conditions for marine hydraulic control valves".
1.2 Marine environmental conditions
The marine environmental conditions of the two-way cartridge valve shall comply with the provisions of Chapter 2 of CB1015-82. 1.3 Requirements for cartridges
1.3.1The valve sleeve installation connection dimensions of the cartridge shall comply with the provisions of GB2877-81. 1.3.2The O-ring and its ring groove dimensions used for the cartridge shall comply with GB3452.182 "Dimension series and tolerances of O-ring rubber seals for hydraulic and pneumatic use". When the working pressure is greater than 10MPa, a retaining ring shall be used. The retaining ring installation position shall be determined according to the force direction. When subjected to bidirectional pressure, two retaining rings shall be used.
1.3.3 The clearance between the core and sleeve of the plug-in should be ensured to be within the specified temperature range and filtration accuracy according to the requirements of 1, and should work well. The allowable value of leakage caused by the clearance should generally not be greater than 0.1% of its nominal flow rate. When used in ships, it should comply with the provisions of CB1015-82.
1.3.4 The material of the plug-in should be selected according to the design requirements and comply with the provisions of relevant specifications and standards. The valve core and valve sleeve should not be made of brittle materials such as cast iron.
1.3.5 When the core of the plug-in needs to have a throttling hole, it is recommended to use a structure with a throttling screw plug to facilitate adjustment and replacement. The throttling screw should have measures to tighten and prevent leakage through the thread gap. 1.3.6 When used in high-water-based liquids, the valve core, valve sleeve, spring and sealing materials of the plug-in should be compatible with the liquid, and the core should consider using a structure with an O-ring and a retaining ring. 1.3.7 The plug-in should be provided with a structure that facilitates the removal from the installation hole and ensures that all parts are not damaged when the plug-in is removed. If a special disassembly tool is required, it should be noted in the relevant documents. 1.4 Requirements for control cover
1.4.1 The installation connection surface size of the control cover on the valve block should comply with the provisions of GB2877-8. 1.4.2 The installation surface where the control cover is connected to the valve block body should be provided with a permanent directional structure. 1.4.3 The inner diameter of the control channel in the control cover is generally consistent with the control channel size specified in GB2877-81, and it is allowed to be appropriately increased or reduced as needed. The inclined holes should be minimized or not used. The orifices of each control channel should be standard and marked with steel stamps or other methods at appropriate locations. The marks should be consistent with the markings on the graphic symbols of the cover. It is recommended to use hexagonal screws and combined sealing rings for the sealing of each orifice. When the structural layout is difficult, other reliable structures can be used instead. 1.4.4 When necessary, the control channel should have a structure that is convenient for installing the throttling screw. 1.4.5 When the control cover adopts a shoulder structure, it should be easy to remove from the wide block mounting hole. 1.4.6 The control cover should be provided with a nameplate at an appropriate position to indicate the graphic symbol, model and manufacturer name of the cover. When the control cover is embedded with a control component, the corresponding mark should be marked at the embedded component. When there is insufficient space, it can be marked on the exposed packaging.
China State Shipbuilding Corporation 1985-11-28 Issue 16
1986-11-15 Implementation
CB1142.3-85
1.4.7 The exposed surface of the control cover should have anti-rust measures, and attention should be paid to the compatibility of the measures with the used liquid. 1.5 Requirements for pilot valves
1.5.1 The installation and connection dimensions of the pilot valves used for two-way cartridge valves shall comply with the provisions of GB2514-81 "Installation surface of return port plate-type hydraulic directional control valves".
1.5.2 The technical conditions and test methods of the pilot valves used for two-way cartridge valves shall comply with the relevant provisions of CB1015-82. 1.5.3 The pilot valves used for two-way cartridge valves shall be provided with a nameplate or logo indicating its functional position, oil port mark, model, specification, main technical performance and manufacturer's name in a conspicuous position. 1.6 Requirements for "two-way cartridge valves"
1.6.1 Two-way cartridge valves supplied as a set shall be tested in accordance with the test methods specified in the inspection rules in Chapter 2 of this standard and accompanied by a certificate of test compliance.
1.6.2 The installation position of the two-way cartridge valve shall make it easy to adjust and replacement shall not involve extensive disassembly of other components. The installation position shall also fully consider protection against control failure, foreboding accidents, high temperatures, etc. During installation, the correct position can be ensured by the permanent directional structure on the control cover.
1.6.3 Two-way cartridge valves with adjustable mechanisms (including fine fine-tuning mechanisms) shall be provided with a mechanism to lock the specified adjustment value of the adjustable element according to the control requirements. Any set value within the specified adjustment range of the adjustable element shall be able to remain stable and Reliably reproduce. It should be ensured that the adjustment value of the adjustable element does not exceed the maximum value on the nameplate. 1.7 Requirements for valve blocks
1.7.1 The size and accuracy of the mounting holes and mating surfaces of the two-way cartridge valves in the block must comply with the requirements of GB2877-81. When the structure has special requirements and needs to change a certain dimension (such as the depth of the hole, etc.), the changed dimension should be clearly marked in the block diagram and explained in words on the drawing.
1.7.2 The minimum spacing between adjacent channels in the steel block should not be less than 5mm when the inner diameter of the adjacent channels does not exceed 50mm; when the inner diameter of the adjacent channels is greater than 50mm, it should not be less than 10mm. If the spacing needs to be reduced due to difficulties in structural layout, strength calculations should be carried out.
1.7.3 Valve block The oil drain channel in the valve block that is connected to the return oil channel in the two-way cartridge valve control oil circuit should, under normal circumstances, be able to be connected back to the oil tank independently and without back pressure.
1.7.4 The main oil ports and inspection holes of the valve block should all have permanent markings. When a one-way valve, shuttle valve, throttling screw or other components are directly embedded in the valve block, an obvious mark should be set on the valve block near the mounting holes of these components and indicate "internal condensation".
1.7.5 The valve block should be made of steel forgings and annealed to eliminate internal stress. When castings are used for products used in civil ships, their material properties should comply with the provisions of CB1015-82. Anti-rust measures should be taken on the surface of the valve block, and attention should be paid to the compatibility with the liquid used. 1.7.6 After the valve block is T-ed, the added The valve block body should be carefully protected to prevent surface damage and dirt, dust, etc. from being mixed during storage, installation and transportation.
1.7.7 The block body made of forgings does not need to be tested for pressure sealing separately, and it is allowed to be evaluated again during the valve block test. The two blocks made of castings should be tested for material tightness and strength separately according to the factory process requirements. The test pressure is 1.5 times the rated working pressure, and the pump pressure time is not less than 3 minutes. Leakage and "sweating" are not allowed. 1.7.8 The valve block body, actuator, oil source, oil tank, etc. should be easy to transport and install. 2 Inspection rules
2.1 The test of marine two-way cartridge valve control components is divided into type test and acceptance test. The requirements of these two tests are carried out in accordance with the provisions of Chapter 5 and Chapter 6 of CB1015-82 respectively. 2.1.1 Two-way cartridge directional valve
8, several typical two-way cartridge directional valve type test items are shown in Table 1.17
General test items
Usage environment conditions
Test quality
Other test items
CB1142.385
Table 1 Type test items and requirements for marine two-way cartridge directional valves
1. Steady-state pressure difference-flow characteristics Test
2. Internal leakage test
3. Minimum control pressure test
4. Recording small opening pressure test
5. Decomposition performance (opening and closing process) test Pressure test, low temperature test:
High temperature test: Warm test:
Bacteria test, salt test
Impact test; Environmental vibration test;
Swing test; Frequency condensation test
1.Continuous 1-way correct action assessment
2. Life verification
The acceptance test items of two-way cartridge directional valves are shown in Table 2. They should all comply with the design and relevant standards
According to the relevant provisions and requirements of CB1015--82, the number of continuous actions should be determined by the maximum load accuracy of the selected device, but not less than 20,000 times. No malfunction or failure is allowed in the continuous operation of 20,000 times. The number of life assessments shall be determined according to the use requirements. Assessment shall be carried out according to the provisions in the design. Table 2 Acceptance test items and requirements for marine two-way cartridge directional valves. General test acceptance items. Temporary environmental condition test. Acceptance items. Other items. 1. Position function inspection. 2. Reversing action. 3. Pressure loss. 4. Internal leakage. 1. After the type test of the specially designed valve has passed the assessment and identification, the acceptance test generally does not carry out the test acceptance of this item. Special cases shall be carried out according to the design requirements and relevant documents. 2. The selected valve must be tested and accepted according to Table 1. The acceptance test is a random inspection and review, and its items shall be specified by the relevant documents. Continuous action without malfunction test. Random inspection can be carried out according to the relevant documents. Valves used in important occasions and for ships can be used as mandatory inspection items. The inspection items 1 to 4 are mandatory inspection items. The inspection items are not less than 20,000 times. No malfunction or failure is allowed. The internal leakage value is not allowed to have obvious changes. 2.1.2 Two-way cartridge pressure control valve CB1142.3-85 Two-way cartridge pressure control valve can be tested as two-way pressure control. Its items and requirements shall comply with CB1015-82 and the relevant provisions of this standard. 2.1.3 One-way cartridge flow control valve Two-way cartridge flow control valve can be tested as throttling agent, through-flow control and made into three-way flow control valve. Its items and requirements shall comply with CB1015-82 and the relevant provisions of this standard. 2.1.4 Control components with composite control functions The test of control components with more than two control functions such as direction-pressure, direction-flow, direction-flow-force, etc. shall be tested with multiple functions, and the requirements shall be in accordance with CB1015--82 and relevant standards. 2.2-General provisions
Each control component under test, including the pilot valve, shall be tested and accepted in accordance with the provisions and requirements of the relevant clauses of this chapter, and a certificate of qualified test and acceptance shall be attached.
Instrument or control cover supplied separately shall also be checked in accordance with the provisions of the relevant clauses of this chapter and a certificate of qualified test shall be attached. 2.3 Composition of the test piece
The two-way cartridge valve under test is installed in a specially designed test valve block, as shown in Figure 1, and the test piece is formed by the basic structure of the valve block and accessories.
B-type flange connection
Figure 1 Main structure of test valve block
CB1142.3-85
2.3.1 The installation holes of the test valve block shall comply with the provisions of GB2877-81 and be consistent with the specifications of the test piece. It is recommended to use flange connection to connect the inlet and outlet oil ports (A, B) of the valve block to the pipeline. The inspection holes from each main oil circuit and control oil circuit are recommended to adopt the structure specified in Article 1.4.3 of this standard. When the specifications of the test piece are large, a structure that is easy to install and fix should be considered. 2.3.2 The test valve block should be able to be flexibly combined with control components of the same specifications and different functions for testing. Each control channel should be able to be easily cut off or connected as needed, and the cut-off channel should be equipped with a screw plug without a throttling hole. After the specifications of the test piece change, the test valve block of the corresponding specifications should be replaced.
2.3.3 There should be a sufficient pressure inspection hole in the test valve block. The valve block for the test is made of steel forgings. When the working fluid used has special requirements for the valve block material or surface treatment, corresponding measures should be considered.
2.4 Test equipment
2.4.1 Test circuit
The test circuit of the two-way cartridge control valve assembly is recommended to adopt the structure shown in Figure 2. ?
Connect to the external control port
Figure 2 Test circuit of two-way cartridge valve control assembly 1-main pump, 2-unloading overflow, 3-humidity meter, 4-pressure gauge, 5-test piece 6-pressure gauge; 7-loading valve; 8-pressure gauge, 9-flow meter: 10-accumulator, 11-control pump, 12-overflow, 15-pressure gauge
2.4.2 Test oil source
2.4.2.1 The flow rate and pressure of the test oil source should be adjustable. 2.4.2.2 The flow rate of the oil source should be greater than the specified flow rate of the test component. The specified flow rate should be the flow rate at an appropriate pressure drop, and not necessarily its maximum allowable flow rate. 2.4.2.$The pressure pulsation of the oil source should be less than 0.5×MPa, and a short-term overload of 20%~30% can be allowed. 2.4.2.4 When the test component is a pressure control component and there are requirements for the performance volume stiffness of the test component and the relevant parts of the test circuit, it is recommended to ensure that the pressure gradient of this part is within the range of the following given values. 20
Grade A accuracy: 3000~4000MPa/s
Grade B accuracy: 600~800MPa/s;
Grade C accuracy: 120~160MPa/s.
The test oil source should generally be accompanied by an independent control oil source. CB1142.3—85
2.4.3 General requirements for test equipment and test, such as pressure points, pressure holes, temperature detection points, filters and pollution levels, test oil test temperature, test conditions, etc., shall comply with the provisions of relevant standards. 8 Test methods
3.1 Test items and methods are as shown in Table 3.
Table 3 Directional control test items and methods
Check valve with pilot control
Two-position three-way
Directional valve with pilot control
Check valve with pressure selector
This test mainly measures the wide-mouth steady-state pressure differential flow characteristics of the plug-in in each control component, so the test can also be used to measure the steady-state positive differential flow characteristics of various plug-ins supplied separately. At this time, the control cover plate used for the test is specified to use the type (C) with two-position three-way pilot reversing valve in this table. The test should be carried out according to the relevant standards of the test method for the steady-state differential pressure flow characteristics of the pressurized disc. 2. The test results of the steady-state differential pressure-flow characteristics should be uniformly formed by the "steady-state differential pressure-flow characteristic curve", as shown in the following figure. In the figure, 4→B represents the curve when the liquid flows from port A to port B, and BA represents the curve when port B flows to port 4. The two curves can also be closed and shaded to represent the internal leakage test. Differential pressure-flow curve CB1142.3-85 3.2.1 Test purpose: To determine the internal leakage between ports A and B with a certain pressure difference when the two-way cartridge valve is in the closed state of the valve core. 3.2.2 Test conditions: During the test, the pressure applied from port 4 or port B should be consistent each time and recorded. Before the test, the test component should complete at least ten consecutive opening and closing processes, and record the interval time from the last opening and closing to the formal measurement and the test time. The leakage measured from port B includes the internal leakage from cavity X (if its pressure is higher than that of port B, and the gap between the valve core and the valve sleeve connects X and B). The measured value of this part should be listed separately to distinguish it from the internal leakage from port A through the valve seat to port B.
The internal leakage measured from port B includes the part leaking from the pilot valve, which should also be listed separately. 3.2.3 Test method
3.2.3.1 When the pilot control is the internal control mode, adjust the pressure valve 2 so that the pressure changes from the indicated pressure 4 to the test pressure of the test piece. Measure the internal leakage of the relevant oil port under different pressure conditions and draw a curve. The typical internal leakage curve is shown in Figure 3. Figure 3 Internal leakage curve
If the oil port under test contains internal leakage from the pilot valve or leakage through the valve core gap, it should be tested separately and the leakage curve or relevant values should be attached. When measuring, the control pressure can be set to the specified value first, and then the measurements can be made separately. 3.2.3.2 When the pilot control is external control, the internal leakage from X to B port and the internal leakage through the pilot valve should be measured separately, and then the internal leakage value should be determined and the curve should be drawn in the same way as in 3.2.3.1. 3.2.3.3 When port A is a high-pressure oil port, the internal control oil is introduced from port A, and port B is connected to the atmosphere, the internal leakage from port B is measured, and then the internal leakage curves at different control pressures are plotted. When port B is a high-pressure oil port, the internal control oil is introduced from port B, and port A is connected to the atmosphere, the internal leakage of port A is measured, and then the internal leakage curves at different control pressures are plotted.
The internal leakage measured from port B includes the leakage from control chamber X to port B. If the control oil is introduced into port B through the pilot valve, the internal leakage of these two parts should be measured separately. The method is: 9. The internal leakage from the pilot valve is separately drawn out and measured. b. Only pressurize the X chamber and measure the internal leakage value from X to port B. Finally, their internal leakage curves and related values should be listed in addition. 3.3 Minimum opening pressure test
3.3.1 Test purpose: This test is used to determine the minimum opening pressure Pomin of port A or port B of the test piece. 3.3.2 Test conditions: Make the upper chamber of the valve core of the test piece meet the atmosphere (pressure P is atmospheric pressure). 3.3.3 Test method: Make the pressure of the pressure gauge 8 in the circuit atmospheric pressure, make the unloading relief valve the starting pressure, and the indication value of the pressure gauge 4 less than the minimum opening pressure of the test piece. Then adjust the overflow pressure from 0 and gradually increase it until oil overflows from port A or B. Record the pressure value at this time and repeat the test several times. The minimum opening pressure Pomino of the valve is determined by the test data. 3. Minimum opening control pressure Pxmin test
To ensure that the valve core of the control component is in the closed state of A and B and not connected to each other under the specified working pressure PA, P=, the minimum control pressure P required is called the minimum control pressure PminCB1142.3-85
3.4.1 Test purpose: This test is used to determine the minimum control chamber pressure required to keep the control valve in the closed state of A and B ports blocked when the specified working pressure values PA and P remain unchanged. 3.4.2 Test conditions: Keep the specified working pressure at ports A and B, and introduce control fluid into the control chamber alone. 8.4.3 Test method
3.4.3.1 Connect ports A (B) to the outlet of pump 1, and port B (A) to the oil tank. The pressure gauge 4 indicates the specified value PA, and the pressure gauge 8 indicates P (atmospheric pressure). The control chamber is supplied with oil by the external control pump 11 alone, and the pressure gauge 13 indicates the specified value Px:PA. Then adjust the external control relief valve port to gradually reduce Px until oil begins to overflow from port B, and then slightly increase Px until the oil stops flowing out. Record the Px pressure value at this time and repeat several times, which is the minimum control pressure. 3.4.3.2 Connect ports A and B to the outlet of pump 1 at the same time, and use pressure gauge 4 to indicate the specified value P=PB. Then measure it in the same way as item 3.4.3.1, and repeat several times. The P pressure value at this time is the minimum control pressure. 3.4.3.3 Connect port A to the outlet of pump 1, port B to the outlet of the additional pump, pressure gauge 4 indicates the specified value of P, pressure gauge 8 indicates the specified value of P (PB≠PA at this time), and then measure in a similar way. 3.5 Minimum closing control pressure test
When the control valve is in the open state of AB connection within the specified working pressure P^, P and flow range Q, the minimum control pressure required to make it completely closed.
3.5.1 Test purpose: Determine the minimum closing control pressure. 3.5.2 Test conditions: Make P^, P^ at the specified working pressure, make the control chamber and the external oil supply pump supply oil, and connect them separately. 3.5.3 Test method: Adjust valve 12 to make the control pressure 0, adjust valve 2 and make the pressure gauges 4 and 8 indicate PA and P as the specified values, and the flow rate is the specified flow rate Q, and then gradually increase the control pressure Px until the valve is completely closed. Repeat the test several times and obtain the minimum closing control pressure from the test record value (the increasing speed of the control pressure shall not exceed 2% of the nominal pressure, and the slope of the step increase speed shall not be less than 700).
3.6 Test of minimum control pressure P*emi. of hydraulic valve 3.6.1 Test purpose: Determine the minimum control pressure Pxemin. 3.6.2 Test conditions: Make the hydraulic control check valve P and P the specified working pressure, the flow Q is within the specified working range, and the control oil is introduced from the external supply pump alone.
3.6.8 Test method: Make the hydraulic control check valve first in the reverse closed state, and adjust valve 2 to keep the reverse pressure within the specified value. 3.7 Transient response test
3.7.1 Test purpose: This test is to determine the transient response characteristics of the opening and closing process of the two-way cartridge directional valve. 3.7.2 Test conditions
3.7.2.1 The oil circuit volume on the output side of the test piece should be a closed volume and should be filled with oil before the test. The size of the enclosed volume, the materials of the chamber and the pipeline should be recorded in the test results. 3.7.2.2 The test should be carried out under the conditions of the rated voltage of the electromagnet and the electromagnet temperature specified below. a. Carry out at the highest temperature of the electromagnet. This temperature should be guaranteed to be within the recommended range of the effective insulation level of the coil in GB1497-79 "Basic Standard for Low Voltage Electrical Appliances". b. The temperature of the electromagnet is obtained by continuously exciting the coil at the rated voltage. During excitation, the flow through the reversing valve is zero, and the entire valve is placed in an ambient temperature equal to the oil temperature during the test. Only after the electromagnet temperature reaches a stable value can the formal test be carried out. Draw the electromagnet temperature rise curve as shown in Figure 4.
CB1142.3-85
Electromagnet humidity
Environmental slack
Time 1(b)
Figure 4 Electromagnet temperature rise curve
3.7.2.3 Adjust the unloading relief valve and the loading valve so that the pressure indicated by the pressure gauge 4 is the test pressure of the test piece. The pressure and flow rate during the test shall be the nominal pressure and flow rate (when the flow rate is larger, the negotiated value is allowed). Then, the control voltage of the electromagnet is turned on and off, and the transient response curve of the opening and closing process of the valve core of the test piece is recorded by the instrument. The pressure-time method or the pressure-displacement-time method can be used. Its typical curve is shown in Figure 5. %s
4 Packaging and transportation
4.1 Inserts
X-displacement
Figure 5 Transient response curve
Inserts provided separately should be coated with anti-rust oil after passing the inspection and then packaged as a set, preferably with sleeves with covers at both ends or plastic packaging with sealing edges. The model, specification, description and qualification certificate of the part should be on or inside the package. It should be placed in a dry place after packaging. 4.2 Control cover
CB1142.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided in sets should be packed in plastic boxes separately and then packed in sets. At the same time, attach certificates of conformity and mark models, specifications and manufacturers.
4.4 Pilot control valve
It should be packed according to the general control valve requirements, but attention should be paid to protecting the exposed electrical plug and the installation surface from damage. The screws should be packed in bags separately or placed in screw holes and then fixed by relevant measures. Relevant technical documents and certificates should be attached. 4.5 Cartridge valve block
When the valve block is provided separately, the block needs to be oil-sealed before installation to prevent contamination of the exposed oil ports. After packing, the valve block should be kept clean and fixed to avoid damage.
The packaging of the valve block should pay attention to the sealing, protection and contamination intrusion of the exposed oil ports. The surroundings should be fixed to prevent loosening and prevent rust, impact or other accidental damage during long-distance transportation. 4.6 When the two-way cartridge valve and valve block leave the factory, the product, spare parts, relevant certificates and technical documents should be sealed, packaged and stamped together, and the packing list should be listed.
4.7 Transportation
Transportation should be reliable, pay attention to moisture-proof, sealing and intact. 5 Spare parts
Spare parts should meet the requirements of ship specifications, and the quantity and items of spare parts should be listed in a special list. Additional remarks:
This standard is proposed by the marine hydraulic component coordination group. This standard is drafted by the 704th Institute.
The main drafter of this standard is Huang Renhao.3 Test method: Make the pressure of the pressure gauge 8 in the circuit atmospheric pressure, make the unloading relief valve the starting pressure, and the indication value of the pressure gauge 4 less than the minimum opening pressure of the test piece. Then adjust the relief pressure from 0 and gradually increase it until oil overflows from the A or B port. Record the pressure value at this time and repeat the test several times. Determine the minimum opening pressure Pomino of the valve from the test data. 3. Minimum opening control pressure Pxmin test
The minimum control pressure P required to ensure that the valve core of the control component is in the closed state of A and B and not connected to each other under the specified working pressure PA and P= is called the minimum control pressure PminCB1142.3-85
3.4.1 Test purpose: This test is used to determine the minimum control chamber pressure required to keep the control valve in the closed state of A and B ports when the specified working pressure values PA and P remain unchanged. 3.4.2 Test conditions: Keep the specified working pressure of A and B ports, and introduce control fluid into the control chamber alone. 8.4.3 Test method
3.4.3.1 Connect port A (B) to the outlet of pump 1, port B (A) to the oil tank, and the pressure gauge 4 indicates the specified value PA, and the pressure gauge 8 indicates P (atmospheric pressure). The control chamber is supplied with oil by the external control pump 11 alone, and the pressure gauge 13 indicates the specified value Px:PA. Then adjust the external control relief valve port to gradually reduce Px until oil begins to overflow from port B, and then slightly increase Px until the oil stops flowing out. Record the Px pressure value at this time and repeat several times, which is the minimum control pressure. 3.4.3.2 Connect ports A and B to the outlet of pump 1 at the same time, and use pressure gauge 4 to indicate the specified value P=PB. Then measure it in the same way as item 3.4.3.1, and repeat several times. The P pressure value at this time is the minimum control pressure. 3.4.3.3 Connect port A to the outlet of pump 1, port B to the outlet of the additional pump, pressure gauge 4 indicates the specified value of P, pressure gauge 8 indicates the specified value of P (PB≠PA at this time), and then measure in a similar way. 3.5 Minimum closing control pressure test
When the control valve is in the open state of AB connection within the specified working pressure P^, P and flow range Q, the minimum control pressure required to make it completely closed.
3.5.1 Test purpose: Determine the minimum closing control pressure. 3.5.2 Test conditions: Make P^, P^ at the specified working pressure, make the control chamber and the external oil supply pump supply oil, and connect them separately. 3.5.3 Test method: Adjust valve 12 to make the control pressure 0, adjust valve 2 and make the pressure gauges 4 and 8 indicate PA and P as the specified values, and the flow rate is the specified flow rate Q, and then gradually increase the control pressure Px until the valve is completely closed. Repeat the test several times and obtain the minimum closing control pressure from the test record value (the increasing speed of the control pressure shall not exceed 2% of the nominal pressure, and the slope of the step increase speed shall not be less than 700).
3.6 Test of minimum control pressure P*emi. of hydraulic valve 3.6.1 Test purpose: Determine the minimum control pressure Pxemin. 3.6.2 Test conditions: Make the hydraulic control check valve P and P the specified working pressure, the flow Q is within the specified working range, and the control oil is introduced from the external supply pump alone.
3.6.8 Test method: Make the hydraulic control check valve first in the reverse closed state, and adjust valve 2 to keep the reverse pressure within the specified value. 3.7 Transient response test
3.7.1 Test purpose: This test is to determine the transient response characteristics of the opening and closing process of the two-way cartridge directional valve. 3.7.2 Test conditions
3.7.2.1 The oil circuit volume on the output side of the test piece should be a closed volume and should be filled with oil before the test. The size of the enclosed volume, the materials of the chamber and the pipeline should be recorded in the test results. 3.7.2.2 The test should be carried out under the conditions of the rated voltage of the electromagnet and the electromagnet temperature specified below. a. Carry out at the highest temperature of the electromagnet. This temperature should be guaranteed to be within the recommended range of the effective insulation level of the coil in GB1497-79 "Basic Standard for Low Voltage Electrical Appliances". b. The temperature of the electromagnet is obtained by continuously exciting the coil at the rated voltage. During excitation, the flow through the reversing valve is zero, and the entire valve is placed in an ambient temperature equal to the oil temperature during the test. Only after the electromagnet temperature reaches a stable value can the formal test be carried out. Draw the electromagnet temperature rise curve as shown in Figure 4.
CB1142.3-85
Electromagnet humidity
Environmental slack
Time 1(b)
Figure 4 Electromagnet temperature rise curve
3.7.2.3 Adjust the unloading relief valve and the loading valve so that the pressure indicated by the pressure gauge 4 is the test pressure of the test piece. The pressure and flow rate during the test shall be the nominal pressure and flow rate (when the flow rate is larger, the negotiated value is allowed). Then, the control voltage of the electromagnet is turned on and off, and the transient response curve of the opening and closing process of the valve core of the test piece is recorded by the instrument. The pressure-time method or the pressure-displacement-time method can be used. Its typical curve is shown in Figure 5. %s
4 Packaging and transportation
4.1 Inserts
X-displacement
Figure 5 Transient response curve
Inserts provided separately should be coated with anti-rust oil after passing the inspection and then packaged as a set, preferably with sleeves with covers at both ends or plastic packaging with sealing edges. The model, specification, description and qualification certificate of the part should be on or inside the package. It should be placed in a dry place after packaging. 4.2 Control cover
CB1142.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided in sets should be packed in plastic boxes separately and then packed in sets. At the same time, attach certificates of conformity and mark models, specifications and manufacturers.
4.4 Pilot control valve
It should be packed according to the general control valve requirements, but attention should be paid to protecting the exposed electrical plug and the installation surface from damage. The screws should be packed in bags separately or placed in screw holes and then fixed by relevant measures. Relevant technical documents and certificates should be attached. 4.5 Cartridge valve block
When the valve block is provided separately, the block needs to be oil-sealed before installation to prevent contamination of the exposed oil ports. After packing, the valve block should be kept clean and fixed to avoid damage.
The packaging of the valve block should pay attention to the sealing, protection and contamination intrusion of the exposed oil ports. The surroundings should be fixed to prevent loosening and prevent rust, impact or other accidental damage during long-distance transportation. 4.6 When the two-way cartridge valve and valve block leave the factory, the product, spare parts, relevant certificates and technical documents should be sealed, packaged and stamped together, and the packing list should be listed.
4.7 Transportation
Transportation should be reliable, pay attention to moisture-proof, sealing and intact. 5 Spare parts
Spare parts should meet the requirements of ship specifications, and the quantity and items of spare parts should be listed in a special list. Additional remarks:
This standard is proposed by the marine hydraulic component coordination group. This standard is drafted by the 704th Institute.
The main drafter of this standard is Huang Renhao.3 Test method: Make the pressure of the pressure gauge 8 in the circuit atmospheric pressure, make the unloading relief valve the starting pressure, and the indication value of the pressure gauge 4 less than the minimum opening pressure of the test piece. Then adjust the relief pressure from 0 and gradually increase it until oil overflows from the A or B port. Record the pressure value at this time and repeat the test several times. Determine the minimum opening pressure Pomino of the valve from the test data. 3. Minimum opening control pressure Pxmin test
The minimum control pressure P required to ensure that the valve core of the control component is in the closed state of A and B and not connected to each other under the specified working pressure PA and P= is called the minimum control pressure PminCB1142.3-85
3.4.1 Test purpose: This test is used to determine the minimum control chamber pressure required to keep the control valve in the closed state of A and B ports when the specified working pressure values PA and P remain unchanged. 3.4.2 Test conditions: Keep the specified working pressure of A and B ports, and introduce control fluid into the control chamber alone. 8.4.3 Test method
3.4.3.1 Connect port A (B) to the outlet of pump 1, port B (A) to the oil tank, and the pressure gauge 4 indicates the specified value PA, and the pressure gauge 8 indicates P (atmospheric pressure). The control chamber is supplied with oil by the external control pump 11 alone, and the pressure gauge 13 indicates the specified value Px:PA. Then adjust the external control relief valve port to gradually reduce Px until oil begins to overflow from port B, and then slightly increase Px until the oil stops flowing out. Record the Px pressure value at this time and repeat several times, which is the minimum control pressure. 3.4.3.2 Connect ports A and B to the outlet of pump 1 at the same time, and use pressure gauge 4 to indicate the specified value P=PB. Then measure it in the same way as item 3.4.3.1, and repeat several times. The P pressure value at this time is the minimum control pressure. 3.4.3.3 Connect port A to the outlet of pump 1, port B to the outlet of the additional pump, pressure gauge 4 indicates the specified value of P, pressure gauge 8 indicates the specified value of P (PB≠PA at this time), and then measure in a similar way. 3.5 Minimum closing control pressure test
When the control valve is in the open state of AB connection within the specified working pressure P^, P and flow range Q, the minimum control pressure required to make it completely closed.
3.5.1 Test purpose: Determine the minimum closing control pressure. 3.5.2 Test conditions: Make P^, P^ at the specified working pressure, make the control chamber and the external oil supply pump supply oil, and connect them separately. 3.5.3 Test method: Adjust valve 12 to make the control pressure 0, adjust valve 2 and make the pressure gauges 4 and 8 indicate PA and P as the specified values, and the flow rate is the specified flow rate Q, and then gradually increase the control pressure Px until the valve is completely closed. Repeat the test several times and obtain the minimum closing control pressure from the test record value (the increasing speed of the control pressure shall not exceed 2% of the nominal pressure, and the slope of the step increase speed shall not be less than 700).
3.6 Test of minimum control pressure P*emi. of hydraulic valve 3.6.1 Test purpose: Determine the minimum control pressure Pxemin. 3.6.2 Test conditions: Make the hydraulic control check valve P and P the specified working pressure, the flow Q is within the specified working range, and the control oil is introduced from the external supply pump alone.
3.6.8 Test method: Make the hydraulic control check valve first in the reverse closed state, and adjust valve 2 to keep the reverse pressure within the specified value. 3.7 Transient response test
3.7.1 Test purpose: This test is to determine the transient response characteristics of the opening and closing process of the two-way cartridge directional valve. 3.7.2 Test conditions
3.7.2.1 The oil circuit volume on the output side of the test piece should be a closed volume and should be filled with oil before the test. The size of the enclosed volume, the materials of the chamber and the pipeline should be recorded in the test results. 3.7.2.2 The test should be carried out under the conditions of the rated voltage of the electromagnet and the electromagnet temperature specified below. a. Carry out at the highest temperature of the electromagnet. This temperature should be guaranteed to be within the recommended range of the effective insulation level of the coil in GB1497-79 "Basic Standard for Low Voltage Electrical Appliances". b. The temperature of the electromagnet is obtained by continuously exciting the coil at the rated voltage. During excitation, the flow through the reversing valve is zero, and the entire valve is placed in an ambient temperature equal to the oil temperature during the test. Only after the electromagnet temperature reaches a stable value can the formal test be carried out. Draw the electromagnet temperature rise curve as shown in Figure 4.
CB1142.3-85
Electromagnet humiditybzxz.net
Environmental slack
Time 1(b)
Figure 4 Electromagnet temperature rise curve
3.7.2.3 Adjust the unloading relief valve and the loading valve so that the pressure indicated by the pressure gauge 4 is the test pressure of the test piece. The pressure and flow rate during the test shall be the nominal pressure and flow rate (when the flow rate is larger, the negotiated value is allowed). Then, the control voltage of the electromagnet is turned on and off, and the transient response curve of the opening and closing process of the valve core of the test piece is recorded by the instrument. The pressure-time method or the pressure-displacement-time method can be used. Its typical curve is shown in Figure 5. %s
4 Packaging and transportation
4.1 Inserts
X-displacement
Figure 5 Transient response curve
Inserts provided separately should be coated with anti-rust oil after passing the inspection and then packaged as a set, preferably with sleeves with covers at both ends or plastic packaging with sealing edges. The model, specification, description and qualification certificate of the part should be on or inside the package. It should be placed in a dry place after packaging. 4.2 Control cover
CB1142.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided in sets should be packed in plastic boxes separately and then packed in sets. At the same time, attach certificates of conformity and mark models, specifications and manufacturers.
4.4 Pilot control valve
It should be packed according to the general control valve requirements, but attention should be paid to protecting the exposed electrical plug and the installation surface from damage. The screws should be packed in bags separately or placed in screw holes and then fixed by relevant measures. Relevant technical documents and certificates should be attached. 4.5 Cartridge valve block
When the valve block is provided separately, the block needs to be oil-sealed before installation to prevent contamination of the exposed oil ports. After packing, the valve block should be kept clean and fixed to avoid damage.
The packaging of the valve block should pay attention to the sealing, protection and contamination intrusion of the exposed oil ports. The surroundings should be fixed to prevent loosening and prevent rust, impact or other accidental damage during long-distance transportation. 4.6 When the two-way cartridge valve and valve block leave the factory, the product, spare parts, relevant certificates and technical documents should be sealed, packaged and stamped together, and the packing list should be listed.
4.7 Transportation
Transportation should be reliable, pay attention to moisture-proof, sealing and intact. 5 Spare parts
Spare parts should meet the requirements of ship specifications, and the quantity and items of spare parts should be listed in a special list. Additional remarks:
This standard is proposed by the marine hydraulic component coordination group. This standard is drafted by the 704th Institute.
The main drafter of this standard is Huang Renhao.3 Connect port A to the outlet of pump 1, port B to the outlet of the additional pump, pressure gauge 4 indicates the specified value of P, pressure gauge 8 indicates the specified value of P (PB≠PA at this time), and then measure in a similar way. 3.5 Minimum closing control pressure test
When the control valve is in the open state of AB connection within the specified working pressure P^, P and flow range Q, the minimum control pressure required to make it completely closed.
3.5.1 Test purpose: Determine the minimum closing control pressure. 3.5.2 Test conditions: Make P^, P^ at the specified working pressure, make the control chamber and the external oil supply pump supply oil, and connect them separately. 3.5.3 Test method: Adjust valve 12 to make the control pressure 0, adjust valve 2 and make the pressure gauges 4 and 8 indicate PA and P as the specified values, and the flow rate is the specified flow rate Q, and then gradually increase the control pressure Px until the valve is completely closed. Repeat the test several times and obtain the minimum closing control pressure from the test record value (the increasing speed of the control pressure shall not exceed 2% of the nominal pressure, and the slope of the step increase speed shall not be less than 700).
3.6 Test of minimum control pressure P*emi. of hydraulic valve 3.6.1 Test purpose: Determine the minimum control pressure Pxemin. 3.6.2 Test conditions: Make the hydraulic control check valve P and P the specified working pressure, the flow Q is within the specified working range, and the control oil is introduced from the external supply pump alone.
3.6.8 Test method: Make the hydraulic control check valve first in the reverse closed state, and adjust valve 2 to keep the reverse pressure within the specified value. 3.7 Transient response test
3.7.1 Test purpose: This test is to determine the transient response characteristics of the opening and closing process of the two-way cartridge directional valve. 3.7.2 Test conditions
3.7.2.1 The oil circuit volume on the output side of the test piece should be a closed volume and should be filled with oil before the test. The size of the enclosed volume, the materials of the chamber and the pipeline should be recorded in the test results. 3.7.2.2 The test should be carried out under the conditions of the rated voltage of the electromagnet and the electromagnet temperature specified below. a. Carry out at the highest temperature of the electromagnet. This temperature should be guaranteed to be within the recommended range of the effective insulation level of the coil in GB1497-79 "Basic Standard for Low Voltage Electrical Appliances". b. The temperature of the electromagnet is obtained by continuously exciting the coil at the rated voltage. During excitation, the flow through the reversing valve is zero, and the entire valve is placed in an ambient temperature equal to the oil temperature during the test. Only after the electromagnet temperature reaches a stable value can the formal test be carried out. Draw the electromagnet temperature rise curve as shown in Figure 4.
CB1142.3-85
Electromagnet humidity
Environmental slack
Time 1(b)
Figure 4 Electromagnet temperature rise curve
3.7.2.3 Adjust the unloading relief valve and the loading valve so that the pressure indicated by the pressure gauge 4 is the test pressure of the test piece. The pressure and flow rate during the test shall be the nominal pressure and flow rate (when the flow rate is larger, the negotiated value is allowed). Then, the control voltage of the electromagnet is turned on and off, and the transient response curve of the opening and closing process of the valve core of the test piece is recorded by the instrument. The pressure-time method or the pressure-displacement-time method can be used. Its typical curve is shown in Figure 5. %s
4 Packaging and transportation
4.1 Inserts
X-displacement
Figure 5 Transient response curve
Inserts provided separately should be coated with anti-rust oil after passing the inspection and then packaged as a set, preferably with sleeves with covers at both ends or plastic packaging with sealing edges. The model, specification, description and qualification certificate of the part should be on or inside the package. It should be placed in a dry place after packaging. 4.2 Control cover
CB1142.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided in sets should be packed in plastic boxes separately and then packed in sets. At the same time, attach certificates of conformity and mark models, specifications and manufacturers.
4.4 Pilot control valve
It should be packed according to the general control valve requirements, but attention should be paid to protecting the exposed electrical plug and the installation surface from damage. The screws should be packed in bags separately or placed in screw holes and then fixed by relevant measures. Relevant technical documents and certificates should be attached. 4.5 Cartridge valve block
When the valve block is provided separately, the block needs to be oil-sealed before installation to prevent contamination of the exposed oil ports. After packing, the valve block should be kept clean and fixed to avoid damage.
The packaging of the valve block should pay attention to the sealing, protection and contamination intrusion of the exposed oil ports. The surroundings should be fixed to prevent loosening and prevent rust, impact or other accidental damage during long-distance transportation. 4.6 When the two-way cartridge valve and valve block leave the factory, the product, spare parts, relevant certificates and technical documents should be sealed, packaged and stamped together, and the packing list should be listed.
4.7 Transportation
Transportation should be reliable, pay attention to moisture-proof, sealing and intact. 5 Spare parts
Spare parts should meet the requirements of ship specifications, and the quantity and items of spare parts should be listed in a special list. Additional remarks:
This standard is proposed by the marine hydraulic component coordination group. This standard is drafted by the 704th Institute.
The main drafter of this standard is Huang Renhao.3 Connect port A to the outlet of pump 1, port B to the outlet of the additional pump, pressure gauge 4 indicates the specified value of P, pressure gauge 8 indicates the specified value of P (PB≠PA at this time), and then measure in a similar way. 3.5 Minimum closing control pressure test
When the control valve is in the open state of AB connection within the specified working pressure P^, P and flow range Q, the minimum control pressure required to make it completely closed.
3.5.1 Test purpose: Determine the minimum closing control pressure. 3.5.2 Test conditions: Make P^, P^ at the specified working pressure, make the control chamber and the external oil supply pump supply oil, and connect them separately. 3.5.3 Test method: Adjust valve 12 to make the control pressure 0, adjust valve 2 and make the pressure gauges 4 and 8 indicate PA and P as the specified values, and the flow rate is the specified flow rate Q, and then gradually increase the control pressure Px until the valve is completely closed. Repeat the test several times and obtain the minimum closing control pressure from the test record value (the increasing speed of the control pressure shall not exceed 2% of the nominal pressure, and the slope of the step increase speed shall not be less than 700).
3.6 Test of minimum control pressure P*emi. of hydraulic valve 3.6.1 Test purpose: Determine the minimum control pressure Pxemin. 3.6.2 Test conditions: Make the hydraulic control check valve P and P the specified working pressure, the flow Q is within the specified working range, and the control oil is introduced from the external supply pump alone.
3.6.8 Test method: Make the hydraulic control check valve first in the reverse closed state, and adjust valve 2 to keep the reverse pressure within the specified value. 3.7 Transient response test
3.7.1 Test purpose: This test is to determine the transient response characteristics of the opening and closing process of the two-way cartridge directional valve. 3.7.2 Test conditions
3.7.2.1 The oil circuit volume on the output side of the test piece should be a closed volume and should be filled with oil before the test. The size of the enclosed volume, the materials of the chamber and the pipeline should be recorded in the test results. 3.7.2.2 The test should be carried out under the conditions of the rated voltage of the electromagnet and the electromagnet temperature specified below. a. Carry out at the highest temperature of the electromagnet. This temperature should be guaranteed to be within the recommended range of the effective insulation level of the coil in GB1497-79 "Basic Standard for Low Voltage Electrical Appliances". b. The temperature of the electromagnet is obtained by continuously exciting the coil at the rated voltage. During excitation, the flow through the reversing valve is zero, and the entire valve is placed in an ambient temperature equal to the oil temperature during the test. Only after the electromagnet temperature reaches a stable value can the formal test be carried out. Draw the electromagnet temperature rise curve as shown in Figure 4.
CB1142.3-85
Electromagnet humidity
Environmental slack
Time 1(b)
Figure 4 Electromagnet temperature rise curve
3.7.2.3 Adjust the unloading relief valve and the loading valve so that the pressure indicated by the pressure gauge 4 is the test pressure of the test piece. The pressure and flow rate during the test shall be the nominal pressure and flow rate (when the flow rate is larger, the negotiated value is allowed). Then, the control voltage of the electromagnet is turned on and off, and the transient response curve of the opening and closing process of the valve core of the test piece is recorded by the instrument. The pressure-time method or the pressure-displacement-time method can be used. Its typical curve is shown in Figure 5. %s
4 Packaging and transportation
4.1 Inserts
X-displacement
Figure 5 Transient response curve
Inserts provided separately should be coated with anti-rust oil after passing the inspection and then packaged as a set, preferably with sleeves with covers at both ends or plastic packaging with sealing edges. The model, specification, description and qualification certificate of the part should be on or inside the package. It should be placed in a dry place after packaging. 4.2 Control cover
CB1142.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided in sets should be packed in plastic boxes separately and then packed in sets. At the same time, attach certificates of conformity and mark models, specifications and manufacturers.
4.4 Pilot control valve
It should be packed according to the general control valve requirements, but attention should be paid to protecting the exposed electrical plug and the installation surface from damage. The screws should be packed in bags separately or placed in screw holes and then fixed by relevant measures. Relevant technical documents and certificates should be attached. 4.5 Cartridge valve block
When the valve block is provided separately, the block needs to be oil-sealed before installation to prevent contamination of the exposed oil ports. After packing, the valve block should be kept clean and fixed to avoid damage.
The packaging of the valve block should pay attention to the sealing, protection and contamination intrusion of the exposed oil ports. The surroundings should be fixed to prevent loosening and prevent rust, impact or other accidental damage during long-distance transportation. 4.6 When the two-way cartridge valve and valve block leave the factory, the product, spare parts, relevant certificates and technical documents should be sealed, packaged and stamped together, and the packing list should be listed.
4.7 Transportation
Transportation should be reliable, pay attention to moisture-proof, sealing and intact. 5 Spare parts
Spare parts should meet the requirements of ship specifications, and the quantity and items of spare parts should be listed in a special list. Additional remarks:
This standard is proposed by the marine hydraulic component coordination group. This standard is drafted by the 704th Institute.
The main drafter of this standard is Huang Renhao.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed and packed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided as a set should be packed in plastic boxes separately and then packed as a set. At the same time, attach certificates of conformity and mark models, specifications and manufacturers.
4.4 Pilot control valves
Should be packed according to general control requirements, but attention should be paid to protecting the exposed electrical plugs and installation surfaces from damage. The screws should be packed in bags separately or placed in screw holes and then fixed by relevant measures. Relevant technical documents and certificates should be attached. 4.5 Cartridge valve block
When the valve block is provided separately, the block needs to be oil-sealed before installation to prevent contamination of the exposed oil ports. After packing, the valve block should be kept clean and fixed to avoid damage.
The packaging of the valve block should pay attention to the sealing, protection and contamination intrusion of the exposed oil ports. The surroundings should be fixed to prevent loosening and prevent rust, impact or other accidental damage during long-distance transportation. 4.6 When the two-way cartridge valve and valve block leave the factory, the product, spare parts, relevant certificates and technical documents should be sealed, packaged and stamped together, and the packing list should be listed.
4.7 Transportation
Transportation should be reliable, pay attention to moisture-proof, sealing and intact. 5 Spare parts
Spare parts should meet the requirements of ship specifications, and the quantity and items of spare parts should be listed in a special list. Additional remarks:
This standard is proposed by the marine hydraulic component coordination group. This standard is drafted by the 704th Institute.
The main drafter of this standard is Huang Renhao.3-85
The control cover provided separately should be coated with anti-rust oil after passing the inspection and packed together with the connecting screws. The installation surface of the cover should be protected to avoid bruises, roughness and pollution, and should be sealed and packed in plastic bags and boxes and attached with certificates of conformity and marked with models, specifications, manufacturers, etc.
4.3 Control components
Control components provided as a set should be packed in plastic boxes separately and then packed as a set. At the same time, attach certifica
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