Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T731094
Pressure Reducing Valve Type Pilot Valve for Loaders
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Pressure Reducing Valve Type Pilot Valve for Loaders
1 Subject Content and Scope of Application
JB/T7310-94
This standard specifies the model, graphic symbols, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, storage and quality assurance of the pressure reducing valve type pilot valve for loaders (hereinafter referred to as pilot valve). This standard applies to pilot valves with hydraulic oil as the working medium. 2 Reference standards
GB/T13306
JB/T5947
JB/JQ20501
General technical conditions for engineering machinery packaging
Test method for internal cleanliness of hydraulic components
Part I Question particle method
Model, graphic special number and basic set number
3.1 Model
Structural features S-Double handle, single handle road marking Number of control ports
Positioning and resetting method
Pressure classification of pressure reducing valve
T--Spring positioning
-Electromagnetic positioning
10. 3~1. 3 MPa
20. 5~1.5 MPa
3-0, 6~2. 2 MPa
Nominal pressure level, B--2.5MPa
Design number 1, 2.3..
Manual
Pressure reducing valve proportional pilot width
3.2 Graphic symbol (taking model BJS1-B3T5S as an example) Approved by the Ministry of Machinery Industry on July 18, 1994
Implementation on July 1, 1995
3.3 Basic parameters and performance indicators
JB/T7310-
The basic parameters and performance indicators of the pilot valve should comply with the provisions of Table 1. Table 1
Nominal pressure
Nominal flow
Pressure regulation range
Pressure regulation range deviation
Pressure connection
Pressure deviation
Note: P, P%: pressure values of the pressure regulation range starting point and ending point, see Appendix A (reference) Figure A2. 4 Technical requirements
4.1 The pilot valve shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. Internal leakage
mL/min
4.2 When the pilot valve is tested under the conditions of oil temperature of 50±2℃ and oil kinematic viscosity of (17～43)X10-*m*/s, its performance shall comply with the provisions of Table 1.
4.3 The material of the parts shall comply with the provisions of the drawings, and substitution is allowed without reducing the product quality. 4.4 The body should be subjected to a pressure test. The test pressure is 1.5 times the maximum working pressure, and the pressure holding time is not less than 1 minute. During the test, there should be no abnormal phenomena such as leakage and damage. 4.5 Parts can be put into storage only after passing the inspection. Parts that are deformed, scratched, rusted, etc. due to improper storage or transportation and affect product quality shall not be used for assembly.
Outsourced parts and purchased parts must have an inspection certificate. Seals that are scratched, pulled, cut, aged, or have exceeded the validity period provided by the manufacturer shall not be used for assembly. 4.7 Parts should be deburred and cleaned carefully before assembly. 4.8 The joint surfaces between parts should be flat during assembly, and the relative misalignment of the machined surface shall not be greater than 1mm. After assembly, the movable valve core should remain flexible and free of sticking. 4.9
When the core is moved, the oil pressure at the working port must rise smoothly as the handle angle increases, and the pressure adjustment range should meet the specified requirements. 4.10
After the pilot valve passes the test, the exposed surface should be coated with anti-rust grease, and the other surfaces should be painted. The coating thickness and color selection should be uniform and the appearance should be smooth and flat.
4.12 Reliability
JB/T 7310—94
4.12.1 With the main engine reliability of 1000h, the average unexplained working time MTBF should not be less than 200h, 4.12.2 The pilot valve reliability effectiveness K value should not be less than 85%. 4. 12.3
Under normal use and maintenance conditions, the life of the first overhaul period should not be less than 6000h. 5 Test method
5.1 Test conditions
5.1.1 Test oil
5.1.1.1 Viscosity
When the oil temperature is 50℃, the kinematic viscosity of the oil is (17～43)×10m*/s (special requirements shall be specified separately) 5.1.1.2 Oil temperature
When conducting the test, except for those required by special regulations, the oil entering the pilot valve under test shall be specified as follows: Type test shall be carried out at 50±2℃, Factory test should be carried out at 50±4℃
5.1.1.3 Cleanliness level
The solid contamination level of the test oil shall be in accordance with JB/JQ20501 and shall not be higher than 19/16 (11 level). 5.1.2 Test equipment
5.1.2.1 See Appendix A Figure A1 for the schematic diagram of the test system. 5.1.2.2 Instrument and meter accuracy
The accuracy of the test instruments and meters shall be within the range specified in Table 2. The maximum range of the instrument shall not exceed 2 times the maximum parameter value of the test element.
Table 2 Instrument and meter accuracy
Controlled parameter
Pressure gauge
Thermometer
Note: Type test adopts Class B accuracy, factory test adopts Class C accuracy, steady-state conditions
When the average indication value of the controlled parameter changes within the range of Table 3, it is allowed to record the measured value of the test parameter. Table 3 Permissible variation range of average indicated value of controlled parameter Parameters
5.2 Factory test
Factory test shall be carried out in accordance with the provisions of Table 4.
Test accuracy and slowness
Test items
Adjustment test
Pressure adjustment range
And pressure stability
Internal leakage
Pressure loss
Floating function
JB/T7310-94
Table 4 Factory test items and methods
Test method
(1) Push rod height adjustment:
First, do not install the cover assembly, connect the oil circuit as shown in Figure A1, adjust the wet flow valve 2-1 so that the system pressure is 2.5MPa, and then close the throttle 6. Loosen K, lock the upper end of the valve, and tighten the sleeve until the pressure gauge 3-2 reads 300±50kPa. After heating, turn the sleeve counterclockwise by 1% and the reading of the pressure gauge 3-2 should return to zero. If it is not zero, readjust it until it meets the requirements.
After adjustment, tighten the nut immediately, and the tightening torque is 30±15N.m.
Then follow the same steps to adjust the height of the lever of each port Ks, KsK. (2) Adjustment of the swing block assembly:
Install the balance assembly and remove the hexagon socket screw plug on the blue. While ensuring that the half key is vertically upward, adjust the 4 contacts to be flush with the corresponding lever, and the clearance shall not be greater than 0.1mm. After adjustment, tighten the 4 contacts immediately and then install the hexagon socket screw plug.
Adjust the flow control 2-1 to make the inlet pressure of the test valve 4 2.5MPa, then press down the push rod to make the control rod in the fully open position, and adjust the throttle valve 6 to make the flow through the K port 10L/min
(1) Slowly rotate the operating shaft of the operating handle to make the control rod from fully closed to fully open, and then from fully closed to fully closed. Observe the pressure rise and fall through the pressure gauge 3-2, and measure the control pressure. Repeat the test for no less than 3 times
(2) Move the handle to make the outlet pressure pmz, and stay at this position. Use pressure gauge 3-2 to measure the pressure. Use pressure gauge 3-2 to measure pressure
(3) Turn the hand bridge to make the outlet pressure be and keep it in this position. Use pressure gauge 3-2 to measure the pressure deviation value within 1 minute. (1) Adjust the flow rate 2-1. Make the inlet pressure 2.5MPa, and put the valve stem in the starting position after the working port is actuated 5 times. Then measure the leakage volume from K, K, Ks.K, and each port for 1 minute respectively
(2) With the stem of each port in the starting position, adjust the flow-increasing valve 2-2 to pressurize the K, port to 20MPa+. Put the K. port in the starting position after actuating 5 times. Measure the leakage from port T for 1 minute
Pull the handle to fully open the valve stem of each oil port in turn. Measure the pressure loss from port P to port K, K; K, K. When the flow rate is 10L/min, adjust the overflow valve 2-1. Make the pilot inlet pressure 2.5MPa, adjust the overflow valve 2-2, and pressurize the K port to 20MPa. Under the above test conditions, pull the handle to press down the top rod of the K port, and check the K port through the pressure gauge 3-3.Is the load unloaded at the specified position?
In the middle position, each lever should not have pre-pressure
(1) As the handle angle increases, the control pressure should rise smoothly, and the control pressure range should meet the requirements. At the same time, the corresponding angle range must meet the design requirements
(2) The pressure swing value shall not exceed
±0.15MPa
(3) The pressure offset value shall not exceed
±0.15MPa
(1) The leakage of each day shall not exceed 15mL/min, and the leakage of the D-port shall not exceed 25
mL/min
(2) The leakage of the D-port shall not exceed
30 mL/min
Pressure alarm shall not exceed 0.3
Load position shall meet design requirements
Test items
Pressure test
Quality test
Electromagnetic positioning
Mechanism test
5.3 Type test
JB/T 7310-94
Continued Table 4
Test method
Adjust the relief valve 2-1 so that the pilot valve inlet pressure is SMPa, adjust the relief valve 2-2. Make the pressure of K, port 25MPa, block the T port and K, K: K, K ports, and maintain the pressure for 3min
Block the P port and each control port, pressurize the T port to 0.15MPa and maintain the pressure for 3min
Adjust the relief valve 2-1. Make the pilot oil inlet pressure 2.5MPa. Move the handle for continuous reversing
The type test shall be carried out in accordance with the provisions of Table 5.
Table 5 Type test items and methods
Test items
Factory test
All items
Change in inlet pressure
Change in outlet pressure
Control and create medical power
Characteristic test
Life test
Test method
Carry out according to the factory test method
Adjust the overflow valve 2-1 to make the inlet pressure of the pilot valve 2.5MPa, then press down the lever to make the lever in the fully open position, and adjust the throttle valve 6 to make the flow rate through the K port 10L/min, then adjust the hand lever to make the outlet pressure 0.6MPa
Adjust the relief valve 2-1 to make the inlet pressure change within the range of 0~2.5MPa, measure the change in outlet pressure with the pressure gauge 3-2, and repeat the test 3 times. This test should be carried out in turn at K, K, K, K, K, each port to adjust the flow control valve 2-1, so that the inlet pressure of the pilot valve is 2.5MPa, then press down the push rod to make the valve rod in the fully open position, and adjust the throttle valve 6, so that the flow through the K, port is 10L/min,
Use a mechanical adjustment device with a scale indication to slowly rotate the driving shaft from the starting position to the limit position. Set several measuring points according to the indication on the dial. Record the indication of the control pressure P (called secondary pressure) that changes with the rotation angle of the perturbation shaft,
The same method is used to carry out the above test in turn at KK, K. Each port adjusts the throttle valve 2-1. So that the inlet pressure of the pilot valve is 2.5MPa, and the flow through the tested valve is 10L/min, and each control port is operated. The number of times each working port works shall not be less than 200,000 times
There shall be no external leakage and abnormal conditions such as valve body bulging||t ... |tt||No leakage
When the handle stroke is in place, the electric aldehyde
positioning mechanism can be reliably positioned. When the
line is powered off, it can quickly return to the middle position
without sticking
under the action of the centering spring
Meet the assumed requirements
Not exceeding 0.2MPa
Draw the relationship curve between the change of the perturbation axis rotation angle 6 and the
secondary pressure (see Figure
(1) The main parts shall not be damaged or have abnormal wear
(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the pilot The inspection conducted before delivery. The delivery inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can be delivered only after passing the inspection
6.1.2 The delivery inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the pilot valves tested, the number of random tests for this item shall be doubled. If there are still unqualified items, the items of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before delivery. The sampling plan shall be determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valves manufactured or produced meet the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves for trial production (including transfer production); a.
When the design, process or materials used of the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels should comply with the relevant provisions of GB/T13306. The labels should have clear lines and characters, and be installed in a conspicuous part of the product in a straight and firm manner. The label shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacturing date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4The packaging of the pilot valve shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by negotiation between the supply and demand parties based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation rangeS is the secondary pressure curve when controlling the boom to descend and float; MN, the straight line segment is the pressure adjustment rangeS is the secondary pressure curve when controlling the boom to descend and float; MN, the straight line segment is the pressure adjustment rangeThe daily leakage of KK shall not exceed 15 mL/min, the leakage of the D-port shall not exceed 25 mL/min. (2) The leakage of the D-port shall not exceed 30 mL/min. The pressure alarm shall not exceed 0.3 of the load position. The load position shall meet the design requirements. Test items: Pressure resistance test, Compatibility test, Electromagnetic positioning mechanism test. 5.3 Type test JB/T 7310-94
Continued Table 4
Test method
Adjust the relief valve 2-1 so that the pilot valve inlet pressure is SMPa, adjust the relief valve 2-2. Make the pressure of K, port 25MPa, block the T port and K, K: K, K ports, and maintain the pressure for 3min
Block the P port and each control port, pressurize the T port to 0.15MPa and maintain the pressure for 3min
Adjust the relief valve 2-1. Make the pilot oil inlet pressure 2.5MPa. Move the handle for continuous reversing
The type test shall be carried out in accordance with the provisions of Table 5.
Table 5 Type test items and methods
Test items
Factory test
All items
Change in inlet pressure
Change in outlet pressure
Control and create medical power
Characteristic test
Life test
Test method
Carry out according to the factory test method
Adjust the overflow valve 2-1 to make the inlet pressure of the pilot valve 2.5MPa, then press down the lever to make the lever in the fully open position, and adjust the throttle valve 6 to make the flow rate through the K port 10L/min, then adjust the hand lever to make the outlet pressure 0.6MPa
Adjust the relief valve 2-1 to make the inlet pressure change within the range of 0~2.5MPa, measure the change in outlet pressure with the pressure gauge 3-2, and repeat the test 3 times. This test should be carried out in turn at K, K, K, K, K, each port to adjust the flow control valve 2-1, so that the inlet pressure of the pilot valve is 2.5MPa, then press down the push rod to make the valve rod in the fully open position, and adjust the throttle valve 6, so that the flow through the K, port is 10L/min,
Use a mechanical adjustment device with a scale indication to slowly rotate the driving shaft from the starting position to the limit position. Set several measuring points according to the indication on the dial. Record the indication of the control pressure P (called secondary pressure) that changes with the rotation angle of the perturbation shaft,
The same method is used to carry out the above test in turn at KK, K. Each port adjusts the throttle valve 2-1. So that the inlet pressure of the pilot valve is 2.5MPa, and the flow through the tested valve is 10L/min, and each control port is operated. The number of times each working port works shall not be less than 200,000 times
There shall be no external leakage and abnormal conditions such as valve body bulging||t ... |tt||No slip is allowed
When the handle stroke is in place, the electric positioning mechanism can be reliably positioned. When the power is off, it can quickly return to the middle position without sticking under the action of the centering spring
Meet the assumed requirements
No more than 0.2MPa
Draw a curve of the relationship between the change of the perturbation axis rotation angle 6 and the
secondary pressure (see Figure
(1) The main parts shall not be damaged or have abnormal wear
(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the pilot The inspection conducted before delivery. The delivery inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can be delivered only after passing the inspection
6.1.2 The delivery inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the pilot valves tested, the number of random tests for this item shall be doubled. If there are still unqualified items, the items of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before delivery. The sampling plan shall be determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valves manufactured or produced meet the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves for trial production (including transfer production); a.
When the design, process or materials used of the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels should comply with the relevant provisions of GB/T13306. The labels should have clear lines and characters, and be installed in a conspicuous part of the product in a straight and firm manner. The label shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacture date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4The packaging of the pilot valve shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by the supply and demand parties through negotiation based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation rangeThe daily leakage of KK shall not exceed 15 mL/min, the leakage of the D-port shall not exceed 25 mL/min. (2) The leakage of the D-port shall not exceed 30 mL/min. The pressure alarm shall not exceed 0.3 of the load position. The load position shall meet the design requirements. Test items: Pressure resistance test, Compatibility test, Electromagnetic positioning mechanism test. 5.3 Type test JB/T 7310-94
Continued Table 4
Test method
Adjust the relief valve 2-1 so that the pilot valve inlet pressure is SMPa, adjust the relief valve 2-2. Make the pressure of K, port 25MPa, block the T port and K, K: K, K ports, and maintain the pressure for 3min
Block the P port and each control port, pressurize the T port to 0.15MPa and maintain the pressure for 3min
Adjust the relief valve 2-1. Make the pilot oil inlet pressure 2.5MPa. Move the handle for continuous reversing
The type test shall be carried out in accordance with the provisions of Table 5.
Table 5 Type test items and methods
Test items
Factory test
All items
Change in inlet pressure
Change in outlet pressure
Control and create medical power
Characteristic test
Life test
Test method
Carry out according to the factory test method
Adjust the overflow valve 2-1 to make the inlet pressure of the pilot valve 2.5MPa, then press down the lever to make the lever in the fully open position, and adjust the throttle valve 6 to make the flow rate through the K port 10L/min, then adjust the hand lever to make the outlet pressure 0.6MPa
Adjust the relief valve 2-1 to make the inlet pressure change within the range of 0~2.5MPa, measure the change in outlet pressure with the pressure gauge 3-2, and repeat the test 3 times. This test should be carried out in turn at K, K, K, K, K, each port to adjust the flow control valve 2-1, so that the inlet pressure of the pilot valve is 2.5MPa, then press down the push rod to make the valve rod in the fully open position, and adjust the throttle valve 6, so that the flow through the K, port is 10L/min,
Use a mechanical adjustment device with a scale indication to slowly rotate the driving shaft from the starting position to the limit position. Set several measuring points according to the indication on the dial. Record the indication of the control pressure P (called secondary pressure) that changes with the rotation angle of the perturbation shaft,
The same method is used to carry out the above test in turn at KK, K. Each port adjusts the throttle valve 2-1. So that the inlet pressure of the pilot valve is 2.5MPa, and the flow through the tested valve is 10L/min, and each control port is operated. The number of times each working port works shall not be less than 200,000 times
There shall be no external leakage and abnormal conditions such as valve body bulging||t ... |tt||No leakage
When the handle stroke is in place, the electric aldehyde
positioning mechanism can be reliably positioned. When the
line is powered off, it can quickly return to the middle position
without sticking
under the action of the centering spring
Meet the assumed requirements
Not exceeding 0.2MPa
Draw the relationship curve between the change of the perturbation axis rotation angle 6 and the
secondary pressure (see Figure
(1) The main parts shall not be damaged or have abnormal wear
(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the pilot The inspection conducted before delivery. The delivery inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can be delivered only after passing the inspection
6.1.2 The delivery inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the pilot valves tested, the number of random tests for this item shall be doubled. If there are still unqualified items, the items of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before delivery. The sampling plan shall be determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valves manufactured or produced meet the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves for trial production (including transfer production); a.
When the design, process or materials used of the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels should comply with the relevant provisions of GB/T13306. The labels should have clear lines and characters, and be installed in a conspicuous part of the product in a straight and firm manner. The label shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacturing date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4The packaging of the pilot valve shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by negotiation between the supply and demand parties based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation rangeAfter 15MPa, maintain the pressure for 3min
Adjust the flow rate 2-1. Make the pilot oil inlet pressure 2.5MPa. Move the handle for continuous reversing
The type test shall be carried out as specified in Table 5.
Table 5 Type test items and methods
Test items
Factory test
All items
Change in inlet pressure
Change in outlet pressure
Control and create medical power
Characteristic test
Life test
Test method
Carry out according to the factory test method
Adjust the overflow valve 2-1 to make the inlet pressure of the pilot valve 2.5MPa, then press down the lever to make the lever in the fully open position, and adjust the throttle valve 6 to make the flow rate through the K port 10L/min, then adjust the hand lever to make the outlet pressure 0.6MPa
Adjust the relief valve 2-1 to make the inlet pressure change within the range of 0~2.5MPa, measure the change in outlet pressure with the pressure gauge 3-2, and repeat the test 3 times. This test should be carried out in turn at K, K, K, K, K, each port to adjust the flow control valve 2-1, so that the inlet pressure of the pilot valve is 2.5MPa, then press down the push rod to make the valve rod in the fully open position, and adjust the throttle valve 6, so that the flow through the K, port is 10L/min,
Use a mechanical adjustment device with a scale indication to slowly rotate the driving shaft from the starting position to the limit position. Set several measuring points according to the indication on the dial. Record the indication of the control pressure P (called secondary pressure) that changes with the rotation angle of the perturbation shaft,
The same method is used to carry out the above test in turn at KK, K. Each port adjusts the throttle valve 2-1. So that the inlet pressure of the pilot valve is 2.5MPa, and the flow through the tested valve is 10L/min, and each control port is operated. The number of times each working port works shall not be less than 200,000 times
There shall be no external leakage and abnormal conditions such as valve body bulging||t ... |tt||No slip is allowed
When the handle stroke is in place, the electric positioning mechanism can be reliably positioned. When the power is off, it can quickly return to the middle position without sticking under the action of the centering spring
Meet the assumed requirements
No more than 0.2MPa
Draw a curve of the relationship between the change of the perturbation axis rotation angle 6 and the
secondary pressure (see Figure
(1) The main parts shall not be damaged or have abnormal wear
(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the pilot The inspection conducted before delivery. The delivery inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can be delivered only after passing the inspection
6.1.2 The delivery inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the pilot valves tested, the number of random tests for this item shall be doubled. If there are still unqualified items, the items of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before delivery. The sampling plan shall be determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valves manufactured or produced meet the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves for trial production (including transfer production); a.
When the design, process or materials used of the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels should comply with the relevant provisions of GB/T13306. The labels should have clear lines and characters, and be installed in a conspicuous part of the product in a straight and firm manner. The label shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacture date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4The packaging of the pilot valve shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by the supply and demand parties through negotiation based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94wwW.bzxz.Net
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation rangeAfter 15MPa, maintain the pressure for 3min
Adjust the flow rate 2-1. Make the pilot oil inlet pressure 2.5MPa. Move the handle for continuous reversing
The type test shall be carried out as specified in Table 5.
Table 5 Type test items and methods
Test items
Factory test
All items
Change in inlet pressure
Outlet pressure change caused by change
Control and create medical power
Characteristic test
Life test
Test method
Carry out according to the factory test method
Adjust the overflow valve 2-1 to make the inlet pressure of the pilot valve 2.5MPa, then press down the lever to make the lever in the fully open position, and adjust the throttle valve 6 to make the flow rate through the K port 10L/min. After measuring, adjust the hand lever to make the outlet pressure 0.6MPa
Adjust the relief valve 2-1 to make the inlet pressure change within the range of 0~2.5MPa, measure the change of outlet pressure with the pressure gauge 3-2, and repeat the test 3 times. This test should be carried out in turn at K, K, K, K, K, each port to adjust the flow control valve 2-1, so that the inlet pressure of the pilot valve is 2.5MPa, then press down the push rod to make the valve rod in the fully open position, and adjust the throttle valve 6, so that the flow through the K, port is 10L/min,
Use a mechanical adjustment device with a scale indication to slowly rotate the driving shaft from the starting position to the limit position. Set several measuring points according to the indication on the dial. Record the indication of the control pressure P (called secondary pressure) that changes with the rotation angle of the perturbation shaft,
The same method is used to carry out the above test in turn at KK, K. Each port adjusts the throttle valve 2-1. So that the inlet pressure of the pilot valve is 2.5MPa, and the flow through the tested valve is 10L/min, and each control port is operated. The number of times each working port works shall not be less than 200,000 times
There shall be no external leakage and abnormal conditions such as valve bulging||t ... |tt||No slip is allowed
When the handle stroke is in place, the electric positioning mechanism can be reliably positioned. When the power is off, it can quickly return to the middle position without sticking under the action of the centering spring
Meet the assumed requirements
No more than 0.2MPa
Draw a curve of the relationship between the change of the perturbation axis rotation angle 6 and the
secondary pressure (see Figure
(1) The main parts shall not be damaged or have abnormal wear
(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the pilot The inspection conducted before delivery. The delivery inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can be delivered only after passing the inspection
6.1.2 The delivery inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the pilot valves tested, the number of random tests for this item shall be doubled. If there are still unqualified items, the items of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before delivery. The sampling plan shall be determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valves manufactured or produced meet the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves for trial production (including transfer production); a.
When the design, process or materials used of the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels should comply with the relevant provisions of GB/T13306. The labels should have clear lines and characters, and be installed in a conspicuous part of the product in a straight and firm manner. The label shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacture date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4The packaging of the pilot valve shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by the supply and demand parties through negotiation based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation range5MPa, and make the flow rate through the test object 10L/min, operate each control port, and the number of times each working port works shall not be less than 200,000 times. There shall be no external leakage and abnormal conditions such as bulging and cracking of the body. There shall be no external leakage and slip. When the handle stroke is in place, the electric positioning mechanism can be reliably positioned. When the power is off, it can quickly return to the middle position without sticking under the action of the centering spring. It meets the assumed requirements and shall not exceed 0.2MPa. Draw the relationship curve between the change of the perturbation axis rotation angle 6 and the secondary pressure (see Figure). (1) The main parts shall not be damaged and have abnormal wear. |(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into two categories: factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the quality of the pilot valve before it leaves the factory. The factory inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can only leave the factory after passing the inspection
6.1.2 Factory inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the random test of the pilot valve, the number of random tests for this item shall be doubled. If there are still unqualified items, the item of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before leaving the factory. The sampling plan is determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valve produced or produced meets the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves produced by trial (including transfer production); a.
When the design, process or materials used in the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels shall comply with the relevant provisions of GB/T13306. The labels shall be clearly marked and installed in a prominent position of the product in a straight and firm manner. The labels shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacturing date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4 Pilot valve packaging shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by negotiation between the supply and demand parties based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation range5MPa, and make the flow rate through the test object 10L/min, operate each control port, and the number of times each working port works shall not be less than 200,000 times. There shall be no external leakage and abnormal conditions such as bulging and cracking of the body. There shall be no external leakage and slip. When the handle stroke is in place, the electric positioning mechanism can be reliably positioned. When the power is off, it can quickly return to the middle position without sticking under the action of the centering spring. It meets the assumed requirements and shall not exceed 0.2MPa. Draw the relationship curve between the change of the perturbation axis rotation angle 6 and the secondary pressure (see Figure). (1) The main parts shall not be damaged and have abnormal wear. |(2) The leakage increase value shall not be greater than
(3) There shall be no obvious external leakage
6 Inspection rules
JB/T7310-94
According to different requirements, the inspection is divided into two categories: factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Factory inspection refers to the inspection of the quality of the pilot valve before it leaves the factory. The factory inspection shall be conducted by the quality inspection department of the manufacturer. The pilot valve can only leave the factory after passing the inspection
6.1.2 Factory inspection items are divided into two categories: mandatory test and random test. The number of random tests is 2% of the output of each batch, but shall not be less than 2 units (pieces). If there are unqualified items in the random test of the pilot valve, the number of random tests for this item shall be doubled. If there are still unqualified items, the item of this batch of pilot valves shall be inspected one by one (piece).
6.1.3 The user has the right to re-inspect the product quality according to the mandatory test items and requirements before leaving the factory. The sampling plan is determined by negotiation between the supply and demand parties. 6.2 Type inspection
6.2.1 Type inspection refers to the comprehensive inspection of the quality and performance of the pilot valve to determine whether the pilot valve produced or produced meets the standard requirements.
6.2.2 Type inspection must be carried out for any of the following situations: pilot valves produced by trial (including transfer production); a.
When the design, process or materials used in the pilot valve change, affecting the performance of the pilot valve; e. When the results of the F inspection and the previous type inspection are not allowed to deviate. 6.2.3 The number of pilot valves for type inspection is stipulated to be 3, one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified ones in the inspection, the number of inspected parts should be doubled. If there are still unqualified ones, the batch of pilot valves should be inspected one by one. 7 Marking, packaging and storage
7.1 Product labels shall comply with the relevant provisions of GB/T13306. The labels shall be clearly marked and installed in a prominent position of the product in a straight and firm manner. The labels shall include the following contents:
Pilot valve name and model;
Pilot valve main parameters;
Manufacturer name;
Manufacturing date and factory number.
7.2 Each connection port of the pilot valve shall be sealed with a plastic cover. 7.3 The following documents shall be attached when the pilot valve is packed: a.
Certificate of conformity:
Instruction manual:
c. Packing list.
All documents shall be packed in a plastic bag.
7.4 Pilot valve packaging shall comply with the provisions of JB/T5947. The packaging type and protection method shall be determined by negotiation between the supply and demand parties based on the storage and transportation conditions.
The delivery mark on the outer package should indicate the following: 7.5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure station (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Avoid moisture". 7.6Pilot valves should be stored in a ventilated, coal-free, non-corrosive medium room. From the date of shipment, the manufacturer shall ensure that the product will not be rusted, damaged, or have parts lost due to poor packaging within 12 months under the conditions that meet the product storage and transportation requirements. 8 Quality Assurance
8.1 On the premise that the user complies with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the quality and technical performance of the product meet the requirements of the accompanying technical documents and this standard. During the warranty period, if the parts are damaged due to manufacturing quality problems, the manufacturer shall repair or replace them free of charge. 8.2 The warranty period is valid for 12 months from the date of shipment from the manufacturer (based on the date of the delivery invoice). 8
JB/T 731094
Appendix A
Detection system and characteristic curve
(reference)
Figure A1 Test circuit principle reference diagram
1-1, 1-2 Pressure reducing pump: 2-1, 2-2—Overflow: 3-13-2, 3-3—Pressure gauge; 4—Test room: 5-Flow meter: 6—Throttling, 7-1, 7-2—Manual reversing
Figure A2 Relationship curve between the rotation angle of the pilot valve swing shaft and the secondary pressure Note: N, is the starting point when the control arm is lowered to floating: OKMN, S, S, are the secondary pressure curves when the control bucket and the control arm are raised: OKMN, FS, S are the secondary pressure curves when the control arm is lowered and floating; MN, the straight line segment is the pressure regulation range5
Pilot valve name and quantity;
Batch number and box number (or contract number);
Box size (length × width × height);
Net weight and gross weight:
Packing date;
Destination (port) and consignee:
Departure (port) and delivery note:
JB/T7310—94
Marked with words and signs such as "Handle with care" and "Av
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