Some standard content:
Scope of application
National Standard of the People's Republic of China
Pressure control valve
Test method
Hydraulic fluid power--Valves-Testing method of pressure control valvesUDC 621.646-001.4
GB 8105 ---87
This standard applies to the steady-state performance and transient performance tests of relief valves and pressure reducing valves with hydraulic oil (liquid) as the working medium. Other pressure control valves with similar performance to relief valves and pressure reducing valves can refer to this standard. The test methods for proportional control valves and electro-hydraulic servo valves shall be specified separately. 2 Symbols, dimensions and units
Symbols, dimensions and units are shown in Table 1.
Table 1 Symbols. Dimensions and units
Normal diameter of valve
Linear displacement of control element in valve
Angular displacement of control element in valve
Volume flow rate
Inner diameter of pipe
, differential pressure
Mass density of oil
Kinematic viscosity
Celsius temperature
Equivalent bulk modulus of elasticity
Note: 1) -
Mass; L -
Length:
Time; -
Symbols approved by the State Machinery Industry Commission on 1987-07-13
-Temperature.
ML-IT-2
ME-IT'-2
kg/cm*
1988-07-01 Implementation
3 General
3.1 Test device
3.1.1 Test circuit
GB 8105 --87
3.1.1.1 Figures 1 and 2 are the basic test circuits for relief valves and pressure reducing valves, respectively. A comprehensive test circuit including two or more test conditions is allowed.
3.1.1.2 The flow rate of the oil source should be adjustable. The flow rate of the oil source should be greater than the test flow rate of the valve under test. The pressure pulsation of the oil source shall not be greater than 10.5 MFa, and a short-term pressure overload of 20% to 30% can be allowed. The apparent penetration stiffness composed of the test valve and the relevant parts of the test circuit should ensure that the pressure gradient is within the following given value range: 3000~4000MPa/s;
600~800 MPa/s#
120~160 MPa/s.
3.1.1.3 It is allowed to add components to the given basic test circuit to adjust the pressure, flow or ensure the safe operation of the test system. 3.1.1.4 The inner diameter of the pipe and pipe joint connected to the test valve should be consistent with the diameter of the test valve. 3. 1.2 Position of the pressure measuring point
3.1.2.1 Position of the inlet pressure measuring point
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 be greater than 10d: the distance from the test valve is 5d.
3.1.2.2 The outlet pressure measuring point should be set 10d downstream of the tested valve. 3.1.2.3 When testing according to Class C accuracy, if the position of the pressure measuring point does not meet the above requirements, the corresponding correction value should be given. 3. 1. 3 Pressure measuring hole
3.1.3.1 The diameter of the pressure measuring hole shall not be less than 1mm and shall not be greater than 6mm3.1. 3.2 The length of the pressure measuring hole shall not be less than 2 times the diameter of the pressure measuring hole. 3.1.3.3 The center line of the pressure measuring hole and the center line of the pipeline are straight, and the intersection of the inner surface of the pipeline and the pressure measuring hole should be kept sharp, but without burrs. 3.1.3.4 The inner diameter of the connecting pipe between the pressure measuring point and the measuring instrument shall not be less than 3mm. 3.1.3.5 When connecting the pressure measuring point and the measuring instrument, the air in the connecting pipe should be removed. 3.1.4 Position of temperature measuring point
The temperature measuring point should be set 15d upstream of the inlet pressure measuring point of the tested valve. 3.1.5 Solid contamination level of oil
3.1.5.1 The solid contamination level of the hydraulic oil (liquid) used in the test system shall not be higher than 19/16. Special requirements may be specified.
3.1.5.2 During the test, if the measured values of the same parameter are inconsistent due to the phenomenon of stagnation and cold, the time interval value shall be noted in the test report. 3.1.5.3 The installation position, type and number of filters shall be noted in the test report. 3.1.5.4 The solid contamination level of the oil and the method for determining the contamination level shall be noted in the test report. 3.2 General requirements for the test
3.2.1 Test oil
3.2.1.1 The test report shall indicate:
The type and brand of the test fluid, the viscosity and density of the measured fluid at the test control temperature, and the isentropic bulk elastic modulus. 3.2.1.2 To measure the effect of different oil viscosities at the same temperature, use the same type of oil with different viscosities. 3.2.2 Test temperature
3.2.2.1. When the test element is tested with hydraulic oil as the working medium, the oil temperature at the inlet of the tested valve is 50°C. When other oils are used as the working medium or there are special requirements, other regulations may be made. The actual test temperature should be indicated in the test report. GB8105-87
3.2.2.2 During the cold start test, the oil temperature should be lower than 25°C. Before the test begins, the temperature of the test equipment and the oil should be kept at a certain temperature. After the test begins, the oil temperature is allowed to rise. Record the relationship between temperature, pressure and flow rate over time in the test report. 3.2.2.3 When the test valve has a requirement for test temperature compensation performance, the test temperature can be selected according to the test requirements. 3.2.3 Steady-state condition
3.2.3.1 Steady-state condition refers to the change range of the controlled parameters not exceeding the specified values in Table 2. Record the measured values of the test parameters under steady-state conditions.
Table 2 Allowable range of variation of average indicated values of controlled parameters Test level
Controlled parameters
Flow, %
Pressure, %
Oil temperature, ℃
Viscosity path
3.2.3.2 The number of measurement reading points of the measured parameters and the distribution of the readings taken should be able to reflect the performance of the tested valve in the full range. 3.2.3.3 In order to ensure the repeatability of the test results, the measurement time interval should be specified. 3.3 Pressure test
3.3.1 A pressure test should be carried out before the test valve is tested. 3.3.2 During the pressure test, the pressure test pressure is applied to each pressure-bearing oil port. The pressure test pressure is 1.5 times the maximum working pressure of the oil port, and increases at a rate of 2% of the pressure test pressure per second. The pressure is maintained for 5 minutes, and there shall be no external leakage. 3.3.3 During the pressure test, each oil drain port is connected to the oil tank. 4 Test content
4.1 Overflow valve
4.1.1 Steady-state pressure-flow characteristic test
Set the test valve to the required flow and pressure value (including the highest and lowest pressure values of the valve). Then increase the flow from zero to the maximum value at each test pressure value, and then reduce it from the maximum value to zero, and test the inlet pressure of the test valve during this process. The outlet pressure of the test valve can be atmospheric pressure or the pressure value required by a certain user. 4.1.2 "Control component adjustment * force" test (generally refers to force, torque, pressure or input power) passes the required working flow through the test valve, adjusts its inlet pressure, increases from the lowest value to the highest value, and then decreases from the highest value to the lowest value, and measures the "force" exerted by the control component to change the inlet pressure during this process. In order to avoid clogging and affecting the test value, the control component of the test valve should be operated back and forth at least 10 times within its adjustment range before the test. The test of each set of data should be completed within 60s. 4.1.3 Flow cascade pressure response characteristic test Set the test valve at the required test flow and pressure, operate valve 3, and make the test system pressure drop to the starting pressure (to ensure that the starting pressure value at the inlet of the test valve is not greater than 20% of the final steady-state pressure value), and then quickly close valve 3. So that a pressure gradient selected in 3.1.1.2 is generated in the closed circuit. At this time, at the test valve 6 The pressure response of the test valve is tested at the beginning. The closing time of valve 3 shall not be greater than 10% of the response time of the test valve, and the maximum shall not exceed 10ms. The pressure gradient caused by the compressibility of the oil can be calculated according to the expression =, and should be at least 10 times the measured gradient. The pressure gradient refers to the average pressure change rate within the time interval from 10% to 90% of the difference between the initial steady-state pressure value and the final steady-state pressure value.
GB 8105-87
During the entire test, no oil should pass through the return oil line of the safety valve 2. 4.1.4 Pressure relief and pressure build-up sustaining test
4.1.4.1 Minimum working pressure test
When the relief valve is a pilot control type, a relief control valve 9 can be used to switch the pilot oil circuit to load the test valve 6, and then the minimum working pressure of the test valve at each flow rate is measured. The test method is in accordance with the relevant provisions of GB8107 "Test method for pressure difference-flow characteristics of hydraulic valves".
, 4.1.4.2 Pressure relief time and pressure build-up time test Set the test valve 6 to the required test flow and test pressure, and quickly switch the valve 9: When the relief control valve 9 is switched, test the time required for the test valve 6 to unload from the controlled pressure to the minimum pressure value and the time to re-establish the control pressure value. The switching time of valve 9 shall not be greater than 10% of the response time of the test valve, and the maximum shall not exceed 10ms. 4.2 Pressure reducing valve
4.2.1 Steady-state pressure-flow characteristic test
Set the test valve 6 to the required test flow and outlet pressure value (including the highest and lowest pressure values of the valve), then adjust the flow rate so that the flow rate increases from zero to the maximum value, and then decreases from the maximum value to zero, and measure the outlet pressure value of the test valve 6 during this process. During the test, the inlet pressure of the test valve 6 should be kept stable at the rated pressure value. 4.2.2 Control component adjustment "force\test (generally refers to force, torque or pressure) Set the test valve 6 to the required test flow and outlet pressure value, then adjust the outlet pressure of the test valve to increase the outlet pressure from the lowest value to the highest value, and then decrease from the highest value to the lowest value, and measure the "force" of the control component to change the outlet pressure value during this process. In order to avoid the influence of the clogging surface on the test value, the control component of the test valve should be operated back and forth at least 10 times within its adjustment range before the test. The test of each set of data should be completed within 60s. 4.2.3 Inlet pressure step pressure response characteristic test Regulate valve 2 to make the inlet pressure of the test valve 6 to the required value, then adjust the test valve 6 and valve 8b to make the test valve The flow rate and outlet pressure of valve 6 are set at the required test values. Operate valve 3a to reduce the pressure of the entire test system to the starting pressure (to ensure the full opening of the valve core of the test valve, ensure that this starting pressure does not exceed 50% of the outlet pressure value of the test valve and 20% of the adjusted inlet pressure value of the test valve). Then quickly close valve 3a to generate a pressure gradient selected in 3.1.1.2 in the oil inlet circuit, and measure the transient response of the outlet pressure of the test valve at the outlet of the test valve 6.
4.2:4 Outlet flow cascade pressure response characteristic test Adjust valve 2 to make the inlet pressure of the test valve 6 the required value, and then adjust the test valve 6 and 8a to set the flow rate and outlet pressure of the test valve 6 to the required value. The test value. Close valve 9 to make the outlet flow of the test valve 6 zero, and then open valve 9 to produce a step change in flow in the outlet circuit of the test valve. At this time, the transient response of the outlet pressure of the test valve is measured at the outlet of the test valve 6. The opening time of valve 9 shall not be greater than 10% of the response time of the test valve, and shall not exceed 10ms at most. The oil volume between the whole and the pressure gradient must meet the vertical requirements of the pressure sample, that is, the pressure gradient calculated by the formular must be more than 10 times larger than the pressure gradient in the actual measured outlet pressure response curve of the test valve. Wherein V is the loop volume between the test valve and valve 8a, K is the equivalent volume elastic modulus of the oil; 7 is the flow rate flowing through the test valve. 4.2.5 Pressure relief and pressure build-up characteristic test
4.2.5.1 Minimum working pressure test
When the pressure reducing valve is of pilot control type, a unloading control valve 3b can be used to short-circuit the pilot stage, unload the test valve 6, and measure the minimum working pressure of the test valve at each flow rate point by point. The test method shall comply with the relevant provisions of GB8107. 4.2.5.2 Pressure relief time and pressure build-up time test The test shall be carried out in accordance with 4.1.4.2. When the unloading control valve 3h is switched, the time required for the test valve 6 to unload from the controlled pressure to the minimum pressure value and the time to re-build the required pressure value shall be measured. The switching time of valve 3b shall not be greater than 10% of the response time of the test valve, and shall not exceed 10m5 at most. ..com5 Test report
GB 8105—87
5.1Write a test report based on the test data and results. The symbols and units used are as specified in Table 1. 5.2Test-related information
The information on the valve under test and the test conditions should at least include the following items and be clearly stated in the report: a.
Manufacturer name;
Product specifications (model, serial number, etc.); manufacturer's instructions on the valve:
Detailed list of connecting pipes and pipe joints,
Manufacturer's requirements for filtration;
Filter accuracy level in the test circuit;
Actual solid contamination level of the test oil; test oil (brand and description);
Kinematic viscosity of the test oil;
Density of the test oil:
Equivalent bulk elastic modulus of the test oil, temperature of the test oil;
Ambient temperature.
5.3 Test results
The following test results should be plotted into tables and curves. a.
Proof pressure;
Steady-state pressure-flow characteristics (see Figure 3)
Control component adjustment force" (see Figure 4;
Flow or pressure step pressure response characteristics (see Figure 5): pressure relief, pressure building characteristics (see Figure 6).
Figure 1 Overflow valve test circuit
1-Hydraulic source, 2-Overflow valve (safety valve): 3-Bypass valve: 4-Thermometer: 5---Hygrometer (pressure sensor); 6-Tested lubricant: 7--Flowmeter: 8-Throttling 9 Directional valve 1-Hydraulic source;
2-Overflow valve:
GB 8105—87
Figure 2 Pressure reducing valve test circuit
3—Bypass valve: 4—Thermometer: 5—Pressure gauge (pressure sensing screen) 7—Flowmeter: 8—Throttle, 9—Directional change 6—Test valve:
Note: The oil circuit between the test valve 6 and valve 8 should have sufficient rigidity, and the volume should be as small as possible. Volume flow rate α
Relief valve steady-state pressure-flow characteristic curve
Volume flow
Pressure reducing valve steady-state pressure
Flow characteristic curve
Response time
GB 8105-87
Figure 4 Control component adjustment "force" curve
Standard state recovery time
Figure 5 Pressure control valve transient response characteristic curve Pressure
Final state force
Starting pressure
Pressure building time
GB 8105-87
Starting pressure
Time!
Figure 6 Pressure building and pressure relief characteristic curve
Final state pressure
Relief time
A1 test level
GB 8105—87
Appendix A
Test level
(Supplement)
According to the provisions of GB7935 General Technical Conditions for Hydraulic Components, the test is carried out in one of the three test levels A, B and C. A2 Error
Any test device and method that has been calibrated or compared with national standards and shows that the system error does not exceed the range listed in Table A1 can be used.
Table A1 Allowable system error of test system
Test level
Test instrument parameters
Flow, %
Pressure difference, kPa when the pressure is equal to or greater than 200kPa Gauge pressure, % temperature, ℃
Note: The percentage range given in the table refers to the percentage of the measured value, not the maximum value of the test or the percentage of the maximum reading of the measuring system. Additional remarks:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee and was drafted by Zhejiang University, Shanghai Jiaotong University, and the 704th Institute of the 7th Research Institute of China State Shipbuilding Corporation.2. Control component adjustment "force\test (generally refers to force, torque or pressure) Set the test valve 6 to the required test flow and outlet pressure value, then adjust the outlet pressure of the test valve to increase the outlet pressure from the lowest value to the highest value, and then decrease from the highest value to the lowest value, and measure the control component adjustment "force" to change the outlet pressure value during this process. In order to avoid the clogging surface affecting the test value, the control component of the test valve should be operated back and forth at least 10 times within its adjustment range before the test. The test of each set of data should be completed within 60s. 4.2.3 Inlet pressure step pressure response characteristic test Regulate valve 2 to make the inlet pressure of the test valve 6 the required value, then adjust the test valve 6 and valve 8b to make the test valve 6 The flow rate and outlet pressure are set at the required test values. Operate valve 3a to reduce the pressure of the entire test system to the starting pressure (to ensure the full opening of the valve core of the test valve, ensure that this starting pressure does not exceed 50% of the outlet pressure value of the test valve and 20% of the adjusted inlet pressure value of the test valve). Then quickly close valve 3a to generate a pressure gradient selected in 3.1.1.2 in the oil inlet circuit, and measure the transient response of the outlet pressure of the test valve at the outlet of the test valve 6.
4.2:4 Outlet flow cascade pressure response characteristic test Regulate valve 2 so that the inlet pressure of the test valve 6 is the required value, and then adjust the test valve 6 and 8a so that the flow rate and outlet pressure of the test valve 6 are set to the required test value. value. Close valve 9 to make the outlet flow of the test valve 6 zero, and then open valve 9 to produce a step change in flow in the outlet circuit of the test valve. At this time, the outlet pressure transient response of the test valve is measured at the outlet of the test valve 6. The opening time of valve 9 shall not be greater than 10% of the response time of the test valve, and shall not exceed 10ms at most. The oil volume between the whole and the pressure gradient must meet the vertical requirements of the pressure sample, that is, the pressure gradient calculated by the formular must be more than 10 times larger than the pressure gradient in the actual measured outlet pressure response curve of the test valve. Wherein V is the loop volume between the test valve and valve 8a, K is the equivalent volume elastic modulus of the oil; 7 is the flow rate flowing through the test valve. 4.2.5 Pressure relief and pressure build-up characteristic test | |tt||4.2.5.1 Minimum working pressure test
When the pressure reducing valve is of pilot control type, a unloading control valve 3b can be used to short-circuit the pilot stage, unload the test valve 6, and measure the minimum working pressure of the test valve at each flow rate point by point. The test method shall comply with the relevant provisions of GB8107. 4.2.5.2 Pressure relief time and pressure build-up time test The test shall be carried out in accordance with 4.1.4.2. When the unloading control valve 3h is switched, the time required for the test valve 6 to unload from the controlled pressure to the minimum pressure value and the time to re-build the required pressure value shall be measured. The switching time of valve 3b shall not be greater than 10% of the response time of the test valve, and shall not exceed 10m5 at most. ..com5 Test report
GB 8105—87
5.1Write a test report based on the test data and results. The symbols and units used are as specified in Table 1. 5.2Test-related information
The information on the valve under test and the test conditions should at least include the following items and be clearly stated in the report: a.
Manufacturer name;
Product specifications (model, serial number, etc.); manufacturer's instructions on the valve:
Detailed list of connecting pipes and pipe joints,
Manufacturer's requirements for filtration;
Filter accuracy level in the test circuit;
Actual solid contamination level of the test oil; test oil (brand and description);
Kinematic viscosity of the test oil;
Density of the test oil:
Equivalent bulk elastic modulus of the test oil, temperature of the test oil;
Ambient temperature.
5.3 Test results
The following test results should be plotted into tables and curves. a.
Proof pressure;
Steady-state pressure-flow characteristics (see Figure 3)
Control component adjustment force" (see Figure 4;
Flow or pressure step pressure response characteristics (see Figure 5): pressure relief, pressure building characteristics (see Figure 6).
Figure 1 Overflow valve test circuit
1-Hydraulic source, 2-Overflow valve (safety valve): 3-Bypass valve: 4-Thermometer: 5---Hygrometer (pressure sensor); 6-Tested lubricant: 7--Flowmeter: 8-Throttling 9 Directional valve 1-Hydraulic source;
2-Overflow valve:
GB 8105—87
Figure 2 Pressure reducing valve test circuit
3—Bypass valve: 4—Thermometer: 5—Pressure gauge (pressure sensing screen) 7—Flowmeter: 8—Throttle, 9—Directional change 6—Test valve:
Note: The oil circuit between the test valve 6 and valve 8 should have sufficient rigidity, and the volume should be as small as possible. Volume flow rate α
Relief valve steady-state pressure-flow characteristic curve
Volume flow
Pressure reducing valve steady-state pressure
Flow characteristic curve
Response time
GB 8105-87
Figure 4 Control component adjustment "force" curve
Standard state recovery time
Figure 5 Pressure control valve transient response characteristic curve Pressure
Final state force
Starting pressure
Pressure building time
GB 8105-87
Starting pressure
Time!
Figure 6 Pressure building and pressure relief characteristic curve
Final state pressure
Relief time
A1 test level
GB 8105—87
Appendix A
Test level
(Supplement)
According to the provisions of GB7935 General Technical Conditions for Hydraulic Components, the test is carried out in one of the three test levels A, B and C. A2 Error
Any test device and method that has been calibrated or compared with national standards and shows that the system error does not exceed the range listed in Table A1 can be used.
Table A1 Allowable system error of test system
Test level
Test instrument parameters
Flow, %
Pressure difference, kPa when the pressure is equal to or greater than 200kPa Gauge pressure, % temperature, ℃
Note: The percentage range given in the table refers to the percentage of the measured value, not the maximum value of the test or the percentage of the maximum reading of the measuring system. Additional remarks:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee and was drafted by Zhejiang University, Shanghai Jiaotong University, and the 704th Institute of the 7th Research Institute of China State Shipbuilding Corporation.2. Control component adjustment "force\test (generally refers to force, torque or pressure) Set the test valve 6 to the required test flow and outlet pressure value, then adjust the outlet pressure of the test valve to increase the outlet pressure from the lowest value to the highest value, and then decrease from the highest value to the lowest value, and measure the control component adjustment "force" to change the outlet pressure value during this process. In order to avoid the clogging surface affecting the test value, the control component of the test valve should be operated back and forth at least 10 times within its adjustment range before the test. The test of each set of data should be completed within 60s. 4.2.3 Inlet pressure step pressure response characteristic test Regulate valve 2 to make the inlet pressure of the test valve 6 the required value, then adjust the test valve 6 and valve 8b to make the test valve 6 The flow rate and outlet pressure are set at the required test values. Operate valve 3a to reduce the pressure of the entire test system to the starting pressure (to ensure the full opening of the valve core of the test valve, ensure that this starting pressure does not exceed 50% of the outlet pressure value of the test valve and 20% of the adjusted inlet pressure value of the test valve). Then quickly close valve 3a to generate a pressure gradient selected in 3.1.1.2 in the oil inlet circuit, and measure the transient response of the outlet pressure of the test valve at the outlet of the test valve 6.
4.2:4 Outlet flow cascade pressure response characteristic test Regulate valve 2 so that the inlet pressure of the test valve 6 is the required value, and then adjust the test valve 6 and 8a so that the flow rate and outlet pressure of the test valve 6 are set to the required test value. value. Close valve 9 to make the outlet flow of the test valve 6 zero, and then open valve 9 to produce a step change in flow in the outlet circuit of the test valve. At this time, the outlet pressure transient response of the test valve is measured at the outlet of the test valve 6. The opening time of valve 9 shall not be greater than 10% of the response time of the test valve, and shall not exceed 10ms at most. The oil volume between the whole and the pressure gradient must meet the vertical requirements of the pressure sample, that is, the pressure gradient calculated by the formular must be more than 10 times larger than the pressure gradient in the actual measured outlet pressure response curve of the test valve. Wherein V is the loop volume between the test valve and valve 8a, K is the equivalent volume elastic modulus of the oil; 7 is the flow rate flowing through the test valve. 4.2.5 Pressure relief and pressure build-up characteristic test | |tt||4.2.5.1 Minimum working pressure test
When the pressure reducing valve is of pilot control type, a unloading control valve 3b can be used to short-circuit the pilot stage, unload the test valve 6, and measure the minimum working pressure of the test valve at each flow rate point by point. The test method shall comply with the relevant provisions of GB8107. 4.2.5.2 Pressure relief time and pressure build-up time test The test shall be carried out in accordance with 4.1.4.2. When the unloading control valve 3h is switched, the time required for the test valve 6 to unload from the controlled pressure to the minimum pressure value and the time to re-build the required pressure value shall be measured. The switching time of valve 3b shall not be greater than 10% of the response time of the test valve, and shall not exceed 10m5 at most. ..com5 Test report
GB 8105—87
5.1Write a test report based on the test data and results. The symbols and units used are as specified in Table 1. 5.2Test-related information
The information on the valve under test and the test conditions should at least include the following items and be clearly stated in the report: a.bZxz.net
Manufacturer name;
Product specifications (model, serial number, etc.); manufacturer's instructions on the valve:
Detailed list of connecting pipes and pipe joints,
Manufacturer's requirements for filtration;
Filter accuracy level in the test circuit;
Actual solid contamination level of the test oil; test oil (brand and description);
Kinematic viscosity of the test oil;
Density of the test oil:
Equivalent bulk elastic modulus of the test oil, temperature of the test oil;
Ambient temperature.
5.3 Test results
The following test results should be plotted into tables and curves. a.
Proof pressure;
Steady-state pressure-flow characteristics (see Figure 3)
Control component adjustment force" (see Figure 4;
Flow or pressure step pressure response characteristics (see Figure 5): pressure relief, pressure building characteristics (see Figure 6).
Figure 1 Overflow valve test circuit
1-Hydraulic source, 2-Overflow valve (safety valve): 3-Bypass valve: 4-Thermometer: 5---Hygrometer (pressure sensor); 6-Tested lubricant: 7--Flowmeter: 8-Throttling 9 Directional valve 1-Hydraulic source;
2-Overflow valve:
GB 8105—87
Figure 2 Pressure reducing valve test circuit
3—Bypass valve: 4—Thermometer: 5—Pressure gauge (pressure sensing screen) 7—Flowmeter: 8—Throttle, 9—Directional change 6—Test valve:
Note: The oil circuit between the test valve 6 and valve 8 should have sufficient rigidity, and the volume should be as small as possible. Volume flow rate α
Relief valve steady-state pressure-flow characteristic curve
Volume flow
Pressure reducing valve steady-state pressure
Flow characteristic curve
Response time
GB 8105-87
Figure 4 Control component adjustment "force" curve
Standard state recovery time
Figure 5 Pressure control valve transient response characteristic curve Pressure
Final state force
Starting pressure
Pressure building time
GB 8105-87
Starting pressure
Time!
Figure 6 Pressure building and pressure relief characteristic curve
Final state pressure
Relief time
A1 test level
GB 8105—87
Appendix A
Test level
(Supplement)
According to the provisions of GB7935 General Technical Conditions for Hydraulic Components, the test is carried out in one of the three test levels A, B and C. A2 Error
Any test device and method that has been calibrated or compared with national standards and shows that the system error does not exceed the range listed in Table A1 can be used.
Table A1 Allowable system error of test system
Test level
Test instrument parameters
Flow, %
Pressure difference, kPa when the pressure is equal to or greater than 200kPa Gauge pressure, % temperature, ℃
Note: The percentage range given in the table refers to the percentage of the measured value, not the maximum value of the test or the percentage of the maximum reading of the measuring system. Additional remarks:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee and was drafted by Zhejiang University, Shanghai Jiaotong University, and the 704th Institute of the 7th Research Institute of China State Shipbuilding Corporation.2. When the unloading control valve 3h is switched, measure the time required for the tested valve 6 to reduce the controlled pressure to the minimum pressure value and the time required to re-establish the required pressure value. The switching time of valve 3b shall not be greater than 10% of the response time of the tested valve, and shall not exceed 10m5 at most. ..com5 Test report
GB 8105—87
5.1 Write a test report based on the test data and results. The symbols and units used shall be as specified in Table 1. 5.2 Test-related data
The data on the valve under test and the test conditions shall at least include the following items and shall be clearly stated in the report: a.
Manufacturer name;
Product specifications (model, serial number, etc.); Manufacturer's instructions on the valve:
Detailed list of connecting pipes and pipe joints,
Manufacturer's requirements for filtration;
Filter accuracy level in the test circuit;
Actual solid contamination level of the test oil; Test oil (brand and description);
Kinematic viscosity of the test oil;
Density of the test oil:
Equivalent bulk elastic modulus of the test oil, temperature of the test oil;
Ambient temperature.
5.3 Test results
The following test results shall be plotted in tables and curves. a.
Proof pressure;
Steady-state pressure-flow characteristics (see Figure 3)
Control component adjustment force" (see Figure 4;
Flow or pressure step pressure response characteristics (see Figure 5): pressure relief, pressure building characteristics (see Figure 6).
Figure 1 Overflow valve test circuit
1-Hydraulic source, 2-Overflow valve (safety valve): 3-Bypass valve: 4-Thermometer: 5---Hygrometer (pressure sensor); 6-Tested lubricant: 7--Flowmeter: 8-Throttling 9 Directional valve 1-Hydraulic source;
2-Overflow valve:
GB 8105—87
Figure 2 Pressure reducing valve test circuit
3—Bypass valve: 4—Thermometer: 5—Pressure gauge (pressure sensing screen) 7—Flowmeter: 8—Throttle, 9—Directional change 6—Test valve:
Note: The oil circuit between the test valve 6 and valve 8 should have sufficient rigidity, and the volume should be as small as possible. Volume flow rate α
Relief valve steady-state pressure-flow characteristic curve
Volume flow
Pressure reducing valve steady-state pressure
Flow characteristic curve
Response time
GB 8105-87
Figure 4 Control component adjustment "force" curve
Standard state recovery time
Figure 5 Pressure control valve transient response characteristic curve Pressure
Final state force
Starting pressure
Pressure building time
GB 8105-87
Starting pressure
Time!
Figure 6 Pressure building and pressure relief characteristic curve
Final state pressure
Relief time
A1 test level
GB 8105—87
Appendix A
Test level
(Supplement)
According to the provisions of GB7935 General Technical Conditions for Hydraulic Components, the test is carried out in one of the three test levels A, B and C. A2 Error
Any test device and method that has been calibrated or compared with national standards and shows that the system error does not exceed the range listed in Table A1 can be used.
Table A1 Allowable system error of test system
Test level
Test instrument parameters
Flow, %
Pressure difference, kPa when the pressure is equal to or greater than 200kPa Gauge pressure, % temperature, ℃
Note: The percentage range given in the table refers to the percentage of the measured value, not the maximum value of the test or the percentage of the maximum reading of the measuring system. Additional remarks:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee and was drafted by Zhejiang University, Shanghai Jiaotong University, and the 704th Institute of the 7th Research Institute of China State Shipbuilding Corporation.2. When the unloading control valve 3h is switched, measure the time required for the tested valve 6 to reduce the controlled pressure to the minimum pressure value and the time required to re-establish the required pressure value. The switching time of valve 3b shall not be greater than 10% of the response time of the tested valve, and shall not exceed 10m5 at most. ..com5 Test report
GB 8105—87
5.1 Write a test report based on the test data and results. The symbols and units used shall be as specified in Table 1. 5.2 Test-related data
The data on the valve under test and the test conditions shall at least include the following items and shall be clearly stated in the report: a.
Manufacturer name;
Product specifications (model, serial number, etc.); Manufacturer's instructions on the valve:
Detailed list of connecting pipes and pipe joints,
Manufacturer's requirements for filtration;
Filter accuracy level in the test circuit;
Actual solid contamination level of the test oil; Test oil (brand and description);
Kinematic viscosity of the test oil;
Density of the test oil:
Equivalent bulk elastic modulus of the test oil, temperature of the test oil;
Ambient temperature.
5.3 Test results
The following test results shall be plotted in tables and curves. a.
Proof pressure;
Steady-state pressure-flow characteristics (see Figure 3)
Control component adjustment force" (see Figure 4;
Flow or pressure step pressure response characteristics (see Figure 5): pressure relief, pressure building characteristics (see Figure 6).
Figure 1 Overflow valve test circuit
1-Hydraulic source, 2-Overflow valve (safety valve): 3-Bypass valve: 4-Thermometer: 5---Hygrometer (pressure sensor); 6-Tested lubricant: 7--Flowmeter: 8-Throttling 9 Directional valve 1-Hydraulic source;
2-Overflow valve:
GB 8105—87
Figure 2 Pressure reducing valve test circuit
3—Bypass valve: 4—Thermometer: 5—Pressure gauge (pressure sensing screen) 7—Flowmeter: 8—Throttle, 9—Directional change 6—Test valve:
Note: The oil circuit between the test valve 6 and valve 8 should have sufficient rigidity, and the volume should be as small as possible. Volume flow rate α
Relief valve steady-state pressure-flow characteristic curve
Volume flow
Pressure reducing valve steady-state pressure
Flow characteristic curve
Response time
GB 8105-87
Figure 4 Control component adjustment "force" curve
Standard state recovery time
Figure 5 Pressure control valve transient response characteristic curve Pressure
Final state force
Starting pressure
Pressure building time
GB 8105-87
Starting pressure
Time!
Figure 6 Pressure building and pressure relief characteristic curve
Final state pressure
Relief time
A1 test level
GB 8105—87
Appendix A
Test level
(Supplement)
According to the provisions of GB7935 General Technical Conditions for Hydraulic Components, the test is carried out in one of the three test levels A, B and C. A2 Error
Any test device and method that has been calibrated or compared with national standards and shows that the system error does not exceed the range listed in Table A1 can be used.
Table A1 Allowable system error of test system
Test level
Test instrument parameters
Flow, %
Pressure difference, kPa when the pressure is equal to or greater than 200kPa Gauge pressure, % temperature, ℃
Note: The percentage range given in the table refers to the percentage of the measured value, not the maximum value of the test or the percentage of the maximum reading of the measuring system. Additional remarks:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee and was drafted by Zhejiang University, Shanghai Jiaotong University, and the 704th Institute of the 7th Research Institute of China State Shipbuilding Corporation.
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