Some standard content:
ICS 23.100.30
Machinery Industry Standard of the People's Republic of China
JB/T 10364—2002
Hydraulic Check Valve
Hydraulic Fluid Power Check Valve2002-12-27Issued
2003-04-01Implemented
· Issued by the State Economic and Trade Commission of the People's Republic of ChinaForeword
1 Scope．
2 Normative references
3 Terms and definitions,
4 Quantities, symbols and units
5 Marking and basic parameters
5.1 Marking..
5.2 Basic parameters
6 Technical requirements.
6.1 General requirements..…
6.2 Performance requirements..
6.3 Assembly requirements,
6 .4 Appearance requirements.
7 Performance test methods
7.1 Test equipment
7.2 Test conditions
7.3 Test items and test methods
8 Inspection of assembly and appearance
9 Inspection rules..
Inspection classification
9.2 Sampling,
Judgment rules
Marking, packaging, transportation and storage||tt| |..P..P
Appendix A (Normative Appendix) Test circuit and characteristic curve A.1
Test circuit
Characteristic curvebzxZ.net
Figure A.1 Schematic diagram of test circuit
Pressure-control piston leakage curve
Flow-forward pressure loss curve
Flow-reverse pressure loss curve
Flow-reverse opening minimum control pressure characteristic curveFlow-reverse closing maximum control pressure characteristic curve..Table 1 Quantity, symbol and unit,
Controlled parameter Average display value Allowable variation rangeTable 3 Allowable systematic error of measuring system,
Table 4 Factory test items and methods
Type test items and test methods
Assembly and appearance inspection methods
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JB/T 10364—2002
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JB/T10364--2002
Appendix A of this standard is a normative appendix.
This standard is proposed by the China Machinery Industry Federation. Foreword
This standard is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee. The drafting units of this standard are: Beijing Huade Hydraulic Industry Group Co., Ltd., Dalian Modular Machine Tool Research Institute Hydraulic Technology Engineering Company, Beijing Machinery Industry Automation Research Institute.
The main drafters of this standard are: Fan Jing, Lin Guang, Liu Xinde. This standard is published for the first time.
1 Scope
Hydraulic check valve
JB/T10364—2002
This standard specifies the basic parameters, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage requirements of hydraulic check valves and hydraulically controlled check valves (hereinafter referred to as check valves). This standard applies to one-way valves with threaded connections, plate connections and stacking connections that use hydraulic oil or other liquids with equivalent performance as the working medium.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, its latest version applies to this standard. GB/T786.1 Hydraulic and pneumatic graphic symbols (GB/T786.1—1993, eqvISO1219-1:1991, Fluid power systems and components-
Graphic symbols and circuit diagrams—Part 1: Graphic synbols) GB/T2346 Hydraulic and pneumatic systems and components Nominal pressure series 3 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB/T 2828
GB/T2878
GB/T7935
GB/T8099
GB/T8100
Types and sizes of threaded connection ports for hydraulic componentsGeneral technical requirements for hydraulic components
Mounting surface of hydraulic superimposed valves
Mounting surface of plate-type connection hydraulic pressure control valves, sequence valves, unloading valves, throttle valves and check valvesGB/T14039-2002Codes for solid particle contamination levels of hydraulic transmission oils (GB/T14039—2002, ISO44061999, MOD)
Terms of fluid transmission systems and components (GB/T17446—1998, idtISO5598:1985)GB/T 17446
GB/T17489 Hydraulic particle contamination analysis Extraction of liquid samples from working system pipelines (GB/T17489-1998, idtISO4021:1992)
Evaluation method for cleanliness of hydraulic components and cleanliness index of hydraulic components JB/T 7858
3 Terms and definitions
The terms and definitions established in GB/T17446 and the following terms and definitions apply to this standard. 3.1
Nominal flow
nominal flow
Nominal flow specified for a check valve.
Test flowtest flow
The flow specified when testing the performance of the test valve. 4 Quantities, symbols and units
Quantities, symbols and units are shown in Table 1.
JB/T10364—2002
Nominal diameter of valve
Volume flow
Inner diameter of pipe
Pressure, differential pressure
Oil mass density
Kinematic viscosity
Etc. Extract Bulk elastic modulus
Note: M-
-Mass: L-
Marking and basic parameters
5.1 Marking
Table 1 Quantity, symbol and unit
p, 4p
Length: T-Time:
Temperature.
Pa (MPa)
s (min)
Clear and permanent markings and nameplates should be made at appropriate and obvious locations on the product. The content of the mark and nameplate shall comply with the provisions of GB/T7935, and the graphic symbols used shall comply with the provisions of GB/T786.1. 5.2 Basic parameters
The basic parameters of the check valve shall include: nominal pressure, nominal diameter, nominal flow, rated flow, etc. 6 Technical requirements
6.1 General requirements
The nominal pressure series shall comply with the provisions of GB/T2346. 6.1.11
The plate-type connection installation surface shall comply with the provisions of GB/T8100, and the superimposed installation surface shall comply with the provisions of GB/T8099. 6.1.2
The type and size of the threaded connection oil port shall comply with the provisions of GB/T2878. 6.1.3
Other technical requirements shall comply with the provisions of GB/T7935. 6.1.4
The manufacturer shall state the applicable conditions and environmental requirements of the product in the product samples and related materials. 6.1.5
Performance requirements
The performance requirements of hydraulic check valves shall include: a)
Pressure loss;
Opening pressure;
Internal leakage:
Sealing: Under rated working conditions, the static seal of the hydraulic check valve shall not leak oil, and the dynamic seal shall not drip oil: Pressure resistance: Each pressure-bearing oil port of the hydraulic check valve shall be able to withstand 1.5 times the maximum working pressure of the port, and there shall be no external leakage and e
damage to parts.
Durability: Under rated working conditions, the hydraulic check valve shall be able to withstand the specified number of actions, and its parts shall not have abnormal wear and other f)
forms of damage, and the decline of various performance indicators shall not exceed 10% of the specified value. The performance requirements of hydraulically controlled non-return valves shall include: 6.2.2
a) Control piston leakage;
b) Pressure loss;
Opening pressure;
Minimum control pressure for reverse opening:
Maximum control pressure for reverse closing:
Internal leakage mixing volume:
JB/T10364--2002
Sealing performance: Under rated working conditions, the static seal of the hydraulically controlled non-return valve shall not leak oil, and the dynamic seal shall not drip oil; h) Pressure resistance: Each pressure-bearing oil port of the hydraulically controlled non-return valve shall be able to withstand 1.5 times, there shall be no external leakage and parts damage.
Durability: Under rated working conditions, the hydraulic control check valve shall be able to withstand the specified number of actions, its parts shall not have abnormal wear and other forms of damage, and the decline of various performance indicators shall not exceed 10% of the specified value. 6.3 Assembly requirements
6.3.1 The assembly requirements of the check valve shall comply with the provisions of GB/T7935. 6.3.2 The internal cleanliness requirements of the check valve shall comply with the provisions of JB/T7858. 6.4 Appearance requirements
The appearance of the product shall comply with the provisions of GB/T7935? Performance test method
7.1 Test device
7.1.1 The factory test and type test shall have a test bench that complies with the test circuit shown in Figure A.1. 7.1.2 Flow and pressure of the oil source
The flow of the oil source shall be adjustable and shall be greater than the test flow of the valve under test. The pressure of the oil source should be able to exceed the nominal pressure of the test valve by 20% to 30% for a short time. 7.1.3 It is allowed to add components to the given basic circuit to adjust the pressure, flow or ensure the safe operation of the test system, but it should not affect the performance of the test valve.
7.1.4 The inner diameter of the pipe and pipe joint connected to the test valve should be consistent with the actual diameter of the test valve. 7.1.5 Position of the pressure measuring point:
7.1.5.1 The inlet pressure measuring point should be set between the downstream of the disturbance source (such as valve, elbow) and the upstream of the test valve, and the distance from the disturbance source should not be less than 10d (d is the inner diameter of the pipe), and the distance from the test valve should not be less than 5d. 7.1.5.2 The outlet pressure measuring point should be set at least 10d downstream of the test valve. 7.1.5.3 When testing according to Class C accuracy, the position of the pressure measuring point is allowed to be inconsistent with the above requirements, but the corresponding correction value should be given. 7.1.6 Pressure hole:
The diameter of the pressure hole should be no less than 1mm and no more than 6mm7.1.6.1
The length of the pressure hole should be no less than 2 times the diameter of the pressure hole. 7.1.6.2
The axis of the pressure hole is perpendicular to the axis of the pipeline, and the angle between the inner surface of the pipeline and the pressure hole should be sharp, but no burrs should be allowed. The inner diameter of the connecting pipe between the pressure measuring point and the measuring instrument should be no less than 3mm. 7.1.6.4
When the pressure measuring point is connected to the measuring instrument, the air in the connecting pipe should be removed. 7.1.7 The temperature measuring point should be set at no more than 15d upstream of the pressure measuring point at the inlet of the test valve7.1.8 The oil sampling point should be set in the test circuit according to the provisions of GB/T17489, and the oil sampling point and the extraction liquid sample should be set in the test circuit. 7.2 Test conditions
7.2.1 Test medium
7.2.1.1 The test medium is general hydraulic oil. 7.2.1.2 Temperature of test medium: Unless otherwise specified, type test shall be conducted at 50℃±2℃, and factory inspection shall be conducted at 50℃±4℃.
JB/T 10364—-2002
7.2.1.3 Viscosity of test medium: The kinematic viscosity of oil at 40℃ is 42mm2/s~74mm2/s (special requirements shall be specified separately) 7.2.1.4 Cleanliness of test medium: The solid particle contamination level of the test system oil shall not be higher than the level specified in GB/T14039-2002--/19/16.
7.2.2 Steady-state conditions
7.2.2.1 When the variation range of the average displayed value of the controlled parameter does not exceed the specified value in Table 2, it is regarded as a steady-state condition. The measured values of the test parameters should be recorded under steady-state conditions.
Table 2 Permissible variation range of average displayed value of controlled parameters The controlled parameters corresponding to each measurement accuracy level are
(%)
(%)
Measurement accuracy level See 7.2.4.
Permissible variation range of average displayed value
7.2.2.2 During the type test, the selection of the number of test parameter measurement readings and the distribution of the readings taken should be able to reflect the performance of the test valve in the entire range.
7.2.2.3 In order to ensure the repeatability of the test results, the test parameters should be measured at specified time intervals. 7.2.3 Test flow rate
7.2.3.1 When the specified rated flow rate of the test valve is less than or equal to 200L/min, the test flow rate shall be the rated flow rate. 7.2.3.2 When the specified rated flow rate of the test valve is greater than 200L/min, the test flow rate is allowed to be 200L/min, but it must be evaluated under working conditions, and the performance indicators of the test valve are based on meeting the working conditions. 7.2.3.3 Factory tests are allowed to be carried out at a reduced flow rate, but corresponding correction values should be given to the performance indicators. 7.2.4 Measurement accuracy level
The measurement accuracy level is divided into three levels: A, B, and C. Type inspection should not be lower than level B, and factory inspection should not be lower than level C. The allowable error of the measurement system corresponding to each level shall comply with the provisions of Table 3. Table 3 Allowable systematic error of measurement system
Parameters of measuring instruments and meters of measurement system corresponding to each measurement accuracy level
Pressure (gauge pressure p<0.2MPa)
Pressure (gauge pressure p≥0.2MPa)
7.3 Test items and test methods
7.3.1 Factory test
The factory test items and methods shall be in accordance with the provisions of Table 4. 4
Allowable error
Test items
Pressure resistance
Internal leakage
Control piston
Internal leakage
Forward pressure
Reverse pressure
Opening pressure
Control pressure
Table 4 Factory test items and methods
Switch the electro-hydraulic directional control valve 7 to the right position, adjust the relief valve 2-1, and adjust the pressure from the lowest working pressure, and increase it at a rate of 2% per second to 1/2 of the highest working pressure of the tested valve 4.5 times. After reaching the pressure, maintain the pressure for 5 minutes, change the electric reversing valve 7 three times and then change it to the right position, adjust the relief valve 2-1, make the pressure of the B oil port of the test valve 4 to the nominal pressure and 1MPa, and measure the internal leakage at the A oil port after 1 minute. Close the relief valve 2-3, adjust the relief valve 2-1, make the pressure of the A oil port of the test valve 4 to the nominal pressure, and measure the leakage of the control piston of the test valve 4 (measure at the control oil port X for the internal leakage type and at the leakage port Y for the external leakage type). Make the flow through the test valve 4 the test flow, measure the pressure with pressure gauges 3-1 and 3-2, and the pressure difference is the forward pressure loss of the test valve 4. For the tested hydraulically controlled one-way valve, the forward pressure loss should be tested under two conditions: the control pressure is zero and the control pressure makes the tested hydraulically controlled one-way valve fully open. Switch the electro-hydraulic reversing valve 7 and the manual reversing valve 8 to the right position, adjust the relief valve 2-2, so that the control pressure can ensure that the test valve 4 is fully open, and make the flow through the test valve 4 in the reverse direction the test flow, and measure the pressure with pressure gauges 3-2 and 3-1. The pressure difference is the reverse pressure loss of the test valve 4. Remove the B oil port pipeline of the test valve 4, adjust the relief valve 2-1, and gradually increase the pressure of the A oil port of the test valve 4 from the lowest possible pressure: when the pressure increases to the point where oil flows out of the B oil port of the test valve 4, measure the pressure with the pressure gauge 3-1. This pressure is the opening pressure of the test valve 4. Repeat the test for no less than three times. (1) Reverse opening minimum control pressure test: Switch the electro-hydraulic reversing valve 7 and the manual reversing valve 8 to the right position, and adjust the relief valves 2-1, 2-2 and the relief valve 2-3 to meet the following conditions: a) The pressure of the B oil port of the test valve 4 is 90% of the nominal pressure, and the flow through the test valve 4 in the reverse direction is the test flow; b) The supplied control pressure must make the test valve 4 in the fully open state. Under the above test conditions, adjust the relief valve 2-2 again to increase the control pressure from zero until the flow through the test valve 4 in the reverse direction is the test flow. Use the pressure gauge 3-3 to measure the minimum control pressure when the flow through the test valve 4 in the reverse direction is the test flow, and repeat the test for no less than three times. (2) Reverse closing maximum control pressure test: Switch the electro-hydraulic reversing valve 7 and the manual reversing valve 8 to the right position, and adjust the relief valves 2-1, 2-2 and the relief valve 2-3 to meet the following conditions: a) The oil port pressure of the test valve 4A is as low as possible, and the flow through the test valve 4 in the reverse direction is the test flow:
b) The supplied control pressure must make the test valve 4 in the fully open state. Under the above test conditions, adjust the relief valve 2-2 again to gradually reduce the control pressure until the test valve 4 is reverse closed. Use the pressure gauge 3-3 to measure the maximum control pressure when the test valve 4 is reverse closed. Repeat the test for no less than three times.
Test type
JB/T 10364—2002
Only for hydraulically controlled one-way valves.
When the opening pressure of the test valve is lower than the lowest throttling pressure of the relief valve 2-1, the throttling valve can be used to replace the relief valve 2-1 to adjust the pressure.
JB/T 10364---2002
Test items
Table 4 (continued)
First, clean the test valve. If some parts cannot be cleaned at one time and "false" leakage occurs after operation, it is allowed to be cleaned again. The inspection content is divided into two categories: static seal and dynamic seal:
Sealing
7.3.2 Type test
(1) Static seal: Use clean absorbent paper to stick on the static seal and remove it at the end of the test. If there is oil stain on the absorbent paper, it is oil leakage. (2) Dynamic seal: Place a white paper under the dynamic seal until the end of the test. If there are oil drops on the white paper, it is oil dripping. Type test items and test methods shall be in accordance with the provisions of Table 5. Table 5 Type test items and test methods
Test items
Steady-state characteristics
Test type
Test all items in accordance with the provisions of 7.3.1, and test and draw the characteristic curve diagram in accordance with the following method:
a) In the control piston leakage test, increase the pressure of the A oil port of the test valve 4 gradually from zero to the nominal pressure, set several pressure measuring points (the set number of pressure measuring points should be sufficient to draw the pressure-control piston leakage curve), measure the leakage of the control piston of the test valve 4 point by point, and draw the pressure-control piston leakage curve (see Figure A.2)
b) In the forward pressure loss test, the flow rate through the test valve 4 is gradually increased from zero to the test flow rate, and several measuring points are set in between (the set number of measuring points should be sufficient to draw the flow-forward pressure loss curve), the forward pressure loss of the test valve 4 is measured point by point, and the flow-forward pressure loss curve is drawn (see Figure A.3)
) In the reverse pressure loss test: the flow rate through the test valve is increased to the test flow rate, and several measuring points are set in between (the set number of measuring points should be sufficient to draw the flow-reverse pressure loss curve), the reverse pressure loss of the test valve 4 is measured point by point, and the flow-reverse pressure loss curve is drawn (see Figure A.4). d) During the control pressure characteristic test, for the reverse opening minimum pressure test, the B oil port pressure of the test valve 4 should be 90%, 75%, 50%25% of the nominal pressure and the minimum B oil port pressure PBtai (this pressure refers to the B oil port pressure when the A oil port pressure of the test valve 4 is as low as possible and the flow through the test valve 4 in the reverse direction is the test flow), and under the B oil port pressure of each gear specified above, the control pressure supplied must make the test valve 4 in the fully open state and the flow through the test valve 4 in the reverse direction be the test flow. Then, the control pressure is gradually increased from zero, and the flow qv and the corresponding control pressure Pxo of the reverse flow through the test valve 4 are recorded, and the flow-reverse opening minimum control pressure characteristic curve shown in Figure A.5 is drawn. e) For the reverse closing maximum control pressure test, q and the corresponding control pressure PxC should be recorded, and the flow-reverse closing maximum control pressure characteristic curve shown in Figure A.6 is drawn.
a) Pressure-control piston leakage curve
only hydraulic control check valve draws this curve.
b) Flow-reverse pressure loss curve
curve.
-only hydraulic control check valve draws this curve
c) Flow-reverse opening minimum control pressure characteristic curve-
check valve draws this curve.
only hydraulic control
d) Flow-reverse closing maximum control pressure characteristic curve-————only hydraulic control
check valve draws this curve.
Test items
Durability
Inspection of assembly and appearance
Table 5 (continued)
Adjust the relief valves 2-1 and 2-3 so that the pressure of the A oil port of the test valve 4 is the nominal pressure, and the flow through the test valve 4 is the test flow. Continuously change the direction of the electro-hydraulic directional control valve 7 at a frequency of 60 times/min to test the number of actions of the test valve 4, and after reaching the number of actions specified in the durability index, check the main parts of the test valve 4.
After the durability test, test all items according to the provisions of 7.3.1 factory test. The inspection method of assembly and appearance shall be in accordance with the provisions of Table 6. Table 6 Inspection methods for assembly and appearance
Inspection rules
9.1 Inspection classification
Inspection items
Assembly quality
Internal cleanliness
Appearance quality
Product inspection is divided into wide inspection and type inspection. 9.1.1 Factory inspection
Inspection methods
Visual inspection method.
According to the provisions of JB/T7858.
Visual inspection method.
Factory inspection refers to the various tests that should be carried out when the product is delivered. Inspection type
JB/T10364—-2002
The items and methods of performance inspection shall be in accordance with the provisions of 7.3.1, and the performance requirements shall comply with the provisions of 6.2. The inspection methods for assembly and appearance shall be in accordance with the provisions of Chapter 8, and the quality shall comply with the requirements of 6.3 and 6.4. 9.1.2 Type inspection
Type inspection refers to the comprehensive assessment of product quality, that is, comprehensive inspection according to the technical requirements specified in the standard. Type inspection shall be carried out in any of the following situations: new product development or trial production and identification of old products transferred to the factory: a)
After formal production, when there are major changes in structure, materials, and processes that may affect product performance; b)
When the product is resumed after a long period of suspension: when there is a significant difference between the factory inspection results and the last type inspection results; d)
When the national quality supervision agency proposes a type inspection requirement. e)
The items and methods of performance inspection shall be in accordance with the provisions of 7.3.2, and the performance requirements shall comply with the provisions of 6.2: The inspection methods for assembly and appearance shall be in accordance with the provisions of Chapter 8, and the quality shall comply with the requirements of 6.3 and 6.4. 9.2 Sampling
The sampling plan for product inspection shall be in accordance with the provisions of GB/T2828. Note: Sampling for quality supervision inspection shall be in accordance with relevant regulations, 9.2.1 Factory inspection sampling
a) Qualified quality level (AQL value): 2.5; b) Sampling plan type: Normal inspection one-time sampling plan; Inspection level: General inspection level I: The sample size for durability test is 0.3%, but shall not be less than two units. c)
JB/T103642002
Type inspection sampling
Qualified quality level (AQL value): 2.5[6.5]: Sampling plan type: Normal inspection one-time sampling plan: b)
Sample size: 5 units [2 units].
Note: The values in square brackets are only applicable to durability tests. 9.2.3 Internal cleanliness inspection sampling
Qualified quality level (AQL value): 2.5: a)
Sampling plan type: Normal inspection one-time sampling plan: b)
Inspection level: Special inspection level S-2.
3 Determination rules
According to the provisions of GB/T2828.
Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall be in accordance with the provisions of GB/T7935. Special requirements may be specified separately8
A.1 Test circuit
The schematic diagram of the test circuit is shown in Figure A.1
Appendix A
(Normative Appendix)
Test circuit and characteristic curve
1-1, 1-2---Hydraulic pump2-1, 2-2, 2-3-Relief valve:3-1, 3-2, 3-3-
Flowmeter:6-Thermometer:7-
Electro-hydraulic reversing valve:8-
9-1, 9-2--Fine filter:10-1, 10-2--Pressure gauge;4-
Manual reversing valve:
-Coarse filter.
Figure A.1 Schematic diagram of the test circuit
A.2 Characteristic curve
A.2.1 See Figure A.2 for the leakage curve of the pressure-control piston. A.2.2 Flow-forward pressure loss curve is shown in Figure A.3. A.2.3 Flow-reverse pressure loss curve is shown in Figure A.4. A.2.4 Flow-reverse open minimum control pressure characteristic curve is shown in Figure A.5. A.2.5 Flow-reverse close maximum control pressure characteristic curve is shown in Figure A.6. JB/T 10364--2002
Test valve:
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