Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7044-1993
Hydraulic Axial Piston Pump
Published on September 23, 1993
Test Method
Implemented on July 1, 1994
Ministry of Machinery Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Hydraulic Axial Piston Pump
1 Subject Content and Scope of Application
Test Method
This standard specifies the test method for hydraulic axial piston pump. JB/T70441993
This standard is applicable to the test of hydraulic axial piston pumps with hydraulic oil or other mineral oils of equivalent performance as the working medium and a rated pressure of ≤40MPa.
Cited standards
GB2346
GB2347
GB3767
GB7935
GB7936
3 Terms and symbols
3.1 Terms
Rated pressure
Hydraulic and pneumatic graphic symbols
Hydraulic and pneumatic systems and components Nominal pressure series Hydraulic pumps and motors Nominal displacement series
Determination of sound power level of noise source
Engineering method and quasi-engineering method
General technical conditions for hydraulic components
Method for determination of no-load displacement of hydraulic pumps and motors The highest output pressure that can guarantee the design life while operating continuously within the specified speed range. 3.1.2 No-load pressure
Output pressure not exceeding 5% of the rated pressure or 0.5MPa. 3.1.3 Maximum pressure
The maximum output pressure allowed for short-term operation. 3.1.4 Rated speed
The maximum nominal speed that can ensure the design life under rated pressure and specified oil inlet conditions. 3.1.5 Minimum speed
The minimum speed allowed to maintain a stable output rated pressure. 3.1.6 Displacement
The volume of liquid discharged per revolution of the pump shaft.
3.1.7 No-load displacement
The displacement measured under no-load pressure.
3.1.8 Nominal displacement
The nominal displacement of the product.
3.1.9 Rated operating conditions
Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
JB/T7044-1993
Operating conditions at maximum displacement, rated pressure and rated speed. 3.2 Symbols and units
Symbols and units are shown in Table 1.
Parameter name
Kinematic viscosity
Volumetric efficiency
Total efficiency
Vacuum
Test apparatus and test conditions
4.1 Test circuit
The schematic diagram of the test circuit is shown in Appendix A (reference). Measuring point location
4.2.1 Pressure measuring point
Unit name
Liter per minute
Milliliter per revolution
Revolution per minute
Newton meter
Degree Celsius
Millimeter per second squared
Set at (2~4)d (d is the pipe diameter) from the inlet and outlet of the test pump. During steady-state test, it is allowed to move the measuring point farther from the test pump, but the pressure loss of the pipeline must be considered. The temperature measuring point is set at (2~4)d from the pressure measuring point, which is farther away from the test pump than the pressure measuring point. 4.2.2
Noise measuring point
The location and number of measuring points shall comply with the provisions of Article 6.5 of GB3767. 4.3 Test oil
Viscosity: The kinematic viscosity at 40℃ is 42~74mm2/s (special requirements shall be specified separately). 4.3.1
Oil temperature: Unless otherwise specified, type tests shall be conducted at 50±2℃; factory tests shall be conducted at 50±4℃. Cleanliness: The solid particle contamination level code of the test oil shall not be higher than 19/16.4.4 Steady-state conditions
The steady-state conditions are when the variation range of the average display value of each parameter meets the requirements of Table 2. Under steady-state conditions, each parameter (pressure, flow, torque, speed, etc.) of each set point shall be measured simultaneously. 2
Measurement parameters
Pressure (gauge pressure p<0.2MPa)
Pressure (gauge pressure p≥0.2MPa)
JB/T7044-1993
Accuracy level
Note: Type tests shall not be lower than Class B measurement accuracy; factory tests shall not be lower than Class C measurement accuracy. Measurement accuracy
Measurement accuracy levels A, B, C.
The allowable system error of the measurement system shall comply with the provisions of Table 3. Table 3
Measurement parameters
Pressure (gauge pressure p<0.2MPa)
Pressure (gauge pressure p≥0.2MPa)
Measurement accuracy level
Note: Type test shall not be lower than Class B measurement accuracy; factory test shall not be lower than Class C measurement accuracy. Test items and test methods
Air tightness inspection and running-in
Air tightness inspection and running-in shall be carried out before component testing. c
5.1.1Air tightness inspection: Fill the inner cavity of the pump under test with 0.16MPa clean gas, then immerse it in anti-rust liquid, stay for not less than 1min, and shake it slightly.
5.1.2 Running-in: At rated speed, start from no-load pressure, load step by step, and run-in in stages. The running-in time and pressure level shall be determined according to needs, and the running-in time at rated pressure shall not be less than 2 minutes. 5.2 Type test
Type test items and methods shall be as specified in Table 4. 3
Test items
Displacement verification test
Efficiency test
Variable characteristic test
JB/T70441993
Content and method
Perform as specified in GB7936
a. At maximum displacement and rated speed, gradually increase the outlet pressure of the tested pump to about 25% of the rated pressure. After the test state is stable, measure the data related to efficiency;
b. According to the above method, when the outlet pressure of the tested pump is about 40%, 55%, 70%, 80% and 100% of the rated pressure, measure the data related to efficiency respectively;
c. When the speed is about 100%, 85%, 70%, 55% and 40% of the rated speed, measure the data related to efficiency at the above test pressure points respectively.d. Draw the equal efficiency characteristic curve (see Figure A3, Figure A4) or draw the performance curve (see Figure A5);
e. At the rated speed, when the inlet oil temperature is 20-35℃ and 70-80℃, measure the volumetric efficiency of at least 6 equally divided pressure points in the range from no-load pressure to rated pressure respectively;
f. Draw the characteristic curve of efficiency, flow rate and power changing with pressure (see Figure A6)
A, constant power variable pump
a, determination of the lowest pressure conversion point: adjust the variable mechanism to make the tested pump in the lowest pressure conversion state, and measure the pump outlet pressure;b. Determination of the highest pressure conversion point: adjust the variable mechanism to make the tested pump in the highest pressure conversion state, and measure the pump outlet pressure; c. Determination of constant power characteristics: adjust the variable mechanism according to the design requirements, measure the corresponding data of pressure and flow, and draw the constant power characteristic curve (pressure-flow characteristic curve) (see Figure A7); d. Other characteristics are tested according to the design requirements B. Constant pressure variable pump
Constant pressure static characteristic test: load at maximum displacement and rated speed, and draw the flow-pressure characteristic curve under different set pressures. As shown in the following figure: Set pressure: 33%p, 66%p, 100%p
(L/min）
33%p66%P100%p
Output flow: 0~100%2
→(MPa)
Note: ①The upper and lower curves shall not be less than 10 points respectively; ②The safety valve in the test system shall not be opened; ③p——rated pressure.
C.Other types of variable displacement pumps
Test according to the drawings and their technical requirements or user requirements Remarks
Test items
Self-priming test
Noise test
Low temperature test
High temperature test
Overspeed test
Overload test
Impact test
JB/T7044-1993
Continued Table 4
Content and method
Under the conditions of maximum displacement, rated speed and no-load pressure, measure the displacement when the vacuum degree of the suction port is zero. Take this as a benchmark, gradually increase the suction resistance until the displacement drops by 1%, and measure its vacuum degree. At the maximum displacement and set speed, measure the noise values of at least 6 equally divided pressure points in the range from no-load pressure to rated pressure. Note: rated speed 1500r/min, set speed to 1500r/min; 1000r/min≤rated speed<1500r/min, set speed to 1000r/min; rated speed<1000t/min, set speed to rated speed. Make the test pump and inlet oil temperature below -20℃, and start the test pump at least 5 times under maximum displacement and no-load pressure conditions. Note: The viscosity of the oil is based on the design requirements. Under rated conditions, when the inlet oil temperature is above 90℃, run continuously for at least 1h. Note: The viscosity of the oil is based on the design requirements. At maximum displacement and speed of 115% rated speed, run continuously for 15min at no-load pressure and rated pressure respectively. During the test, the inlet oil temperature of the tested pump is 30-60℃
and it operates continuously under the conditions of maximum displacement, rated speed, maximum pressure or 125% of the rated pressure (select the higher one). During the test, the inlet oil temperature of the tested pump is 30~60℃
A. Fixed displacement and manual variable pump
At maximum displacement and rated speed, the impact frequency is 10~30 times/min, the impact waveform complies with the provisions of Figure A8, and it operates continuouslyB. Constant power variable pump
At the constant power characteristic of 40% rated power and rated speed, the impact frequency is 10~30 times/min, the impact waveform complies with the provisions of Figure A8, and it operates continuouslyC. Constant pressure variable pump
The rated speed, rated pressure, and flow rate are continuously subjected to constant pressure section impact (step) cycle test between 10%gm≤4,≤80%qmm, and the waveform is shown in the figure below:
This test is performed on the self-priming system
a. The background noise should be at least 10dB (A) lower than the measured
noise of the tested pump, otherwise
it should be corrected;
b. This test is an examination item. When there is a requirement for this performance, it can be carried out in industrial tests. Record the impact waveform. Test items. Impact test. Full load test. Efficiency test. External leakage test. In the figure: T. JB/T7044-1993. Continued Table 4. Content and method. Impact cycle period. Rated pressure and low flow holding time. Rated pressure and high flow holding time. P Rated pressure. 9mx—maximum flow. D. Other variable types. Test according to the variable characteristics of maximum power or user requirements. Note: When doing the impact test, the inlet oil temperature of the tested pump is 30-60℃. Under rated working conditions, the inlet oil temperature is 30~60℃. Do continuous operation. After completing the above-mentioned test items, measure the volumetric efficiency and total efficiency under rated working conditions. Wipe the tested pump clean. If some parts cannot be wiped clean at one time, and "leakage" occurs after operation, it is allowed to be wiped clean again. a. Static seal: Press clean absorbent paper on the static seal part, and then remove it. If there is oil stain on the paper, it is oil leakage. b. Dynamic seal: Place white paper under the dynamic seal part. If there are oil drops on the paper within the specified time, it is oil leakage. Note: The continuous operation test time or number refers to the cumulative value after deducting the failure time or number that is not related to the tested pump. 5.3 Factory test. The factory test items and methods are specified in Table 5. Table 5
Test items
Displacement test
Volumetric efficiency test
Variable characteristic test
Overload test
Impact test
External leakage inspection test
Content and method
Measure displacement at maximum displacement, rated speed and no-load pressure.Measure volumetric efficiency at rated working conditions
At rated speed, make the variable mechanism of the tested pump reciprocate for 3 times in full stroke.Under the working conditions of maximum displacement, rated speed, maximum pressure or 125% of rated pressure (the higher one is selected), operate continuously for not less than 1min.Test according to the corresponding method specified in the type test, and the number of impacts shall not be less than 10 times
In the above-mentioned whole test process, check the dynamic and static sealing parts, and there shall be no external leakage
Note: The factory test allows the test speed to replace the rated speed. The test speed can be determined by the enterprise according to the test conditions. Data processing and result expression
6.1 Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power;
Input mechanical power;
In the formula: 9v2.
JB/T70441993
Vae-9v.e / ne
9v2,s /n
=P2e×4Ple×4c ×10%
P2.e×gv2e
2 yuan.
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; Input flow at test pressure, L/min; Speed at test pressure, r/min;
Speed at no-load pressure, r/min;
Displacement at test pressure, mL/r;
No-load displacement at no-load pressure, mL/r; Output test pressure, kPa;
Input pressure, positive if greater than atmospheric pressure, negative if less than atmospheric pressure, kPa; T
Input torque, N
Characteristic curve
Characteristic curves refer to Appendix A (reference) Figure A3~Figure A8.7
Test circuit
A1.1 See Figure A1 for the schematic diagram of the open test circuit. A1.2
See Figure A2 for the schematic diagram of the closed test circuit.
Characteristic curve
Volume efficiency and other efficiency curves refer to Figure A3.
Total efficiency and equal efficiency curves are shown in Figure A4.
A2.3 performance curve is shown in Figure A5.
Characteristic curve is shown in Figure A6.
Constant power characteristic curve is shown in Figure A7.
Impact waveform is shown in Figure A8.
JB/T70441993
Appendix A
Test circuit and characteristic curve
(reference part）Www.bzxZ.net
Drainage position
Replacement position
(L/min）
(Output flow)
9·q-2
(Output flow)
JB/T 70441993
P<input rate）
Output pressure》
P:(output power)
P:(output pressure）
(%)
(L/min)
Transformation a(t/min）
@=×× C
Yuli^(MPa)
Additional Notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard is drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 10(Output pressure)
(%)
(L/min)
Conversion a(t/min)
@=×× C
Yuli^(MPa)
Additional notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard is drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 10(Output pressure)
(%)
(L/min)
Conversion a(t/min)
@=×× C
Yuli^(MPa)
Additional notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard is drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 10≤80%qmm, a constant pressure impact (step) cycle test is continuously carried out, and the waveform is shown in the figure below:
This test is carried out on the self-priming system
a. The background noise should be at least 10dB (A) lower than the actual measured
noise of the test pump, otherwise
it should be corrected;
b. This test is an examination item. When there is a requirement for this performance, it can be carried out in an industrial test. Record the impact waveform. Test items. Impact test. Full load test. Efficiency test. External leakage test. In the figure: T. JB/T7044-1993. Continued Table 4. Content and method. Impact cycle period. Rated pressure and low flow holding time. Rated pressure and high flow holding time. P Rated pressure. 9mx—maximum flow. D. Other variable types. Test according to the variable characteristics of maximum power or user requirements. Note: When doing the impact test, the inlet oil temperature of the tested pump is 30-60℃. Under rated working conditions, the inlet oil temperature is 30~60℃. Do continuous operation. After completing the above-mentioned test items, measure the volumetric efficiency and total efficiency under rated working conditions. Wipe the tested pump clean. If some parts cannot be wiped clean at one time, and "leakage" occurs after operation, it is allowed to be wiped clean again. a. Static seal: Press clean absorbent paper on the static seal part, and then remove it. If there is oil stain on the paper, it is oil leakage. b. Dynamic seal: Place white paper under the dynamic seal part. If there are oil drops on the paper within the specified time, it is oil leakage. Note: The continuous operation test time or number refers to the cumulative value after deducting the failure time or number that is not related to the tested pump. 5.3 Factory test. The factory test items and methods are specified in Table 5. Table 5
Test items
Displacement test
Volumetric efficiency test
Variable characteristic test
Overload test
Impact test
External leakage inspection test
Content and method
Measure displacement at maximum displacement, rated speed and no-load pressure.Measure volumetric efficiency at rated working conditions
At rated speed, make the variable mechanism of the tested pump reciprocate for 3 times in full stroke.Under the working conditions of maximum displacement, rated speed, maximum pressure or 125% of rated pressure (the higher one is selected), operate continuously for not less than 1min.Test according to the corresponding method specified in the type test, and the number of impacts shall not be less than 10 times
In the above-mentioned whole test process, check the dynamic and static sealing parts, and there shall be no external leakage
Note: The factory test allows the test speed to replace the rated speed. The test speed can be determined by the enterprise according to the test conditions. Data processing and result expression
6.1 Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power;
Input mechanical power;
In the formula: 9v2.
JB/T70441993
Vae-9v.e / ne
9v2,s /n
=P2e×4Ple×4c ×10%
P2.e×gv2e
2 yuan.
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; Input flow at test pressure, L/min; Speed at test pressure, r/min;
Speed at no-load pressure, r/min;
Displacement at test pressure, mL/r;
No-load displacement at no-load pressure, mL/r; Output test pressure, kPa;
Input pressure, positive if greater than atmospheric pressure, negative if less than atmospheric pressure, kPa; T
Input torque, N
Characteristic curve
Characteristic curves refer to Appendix A (reference) Figure A3~Figure A8.7
Test circuit
A1.1 See Figure A1 for the schematic diagram of the open test circuit. A1.2
See Figure A2 for the schematic diagram of the closed test circuit.
Characteristic curve
Volume efficiency and other efficiency curves refer to Figure A3.
Total efficiency and equal efficiency curves are shown in Figure A4.
A2.3 performance curve is shown in Figure A5.
Characteristic curve is shown in Figure A6.
Constant power characteristic curve is shown in Figure A7.
Impact waveform is shown in Figure A8.
JB/T70441993
Appendix A
Test circuit and characteristic curve
(reference part）
Drainage position
Replacement position
(L/min）
(Output flow)
9·q-2
(Output flow)
JB/T 70441993
P<input rate）
Output pressure》
P:(output power)
P:(output pressure）
(%)
(L/min)
Transfer a(t/min）
@=×× C
Yuli^(MPa)
Additional Notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard is drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 10≤80%qmm, a constant pressure impact (step) cycle test is continuously carried out, and the waveform is shown in the figure below:
This test is carried out on the self-priming system
a. The background noise should be at least 10dB (A) lower than the actual measured
noise of the test pump, otherwise
it should be corrected;
b. This test is an examination item. When there is a requirement for this performance, it can be carried out in an industrial test. Record the impact waveform. Test items. Impact test. Full load test. Efficiency test. External leakage test. In the figure: T. JB/T7044-1993. Continued Table 4. Content and method. Impact cycle period. Rated pressure and low flow holding time. Rated pressure and high flow holding time. P Rated pressure. 9mx—maximum flow. D. Other variable types. Test according to the variable characteristics of maximum power or user requirements. Note: When doing the impact test, the inlet oil temperature of the tested pump is 30-60℃. Under rated working conditions, the inlet oil temperature is 30~60℃. Do continuous operation. After completing the above-mentioned test items, measure the volumetric efficiency and total efficiency under rated working conditions. Wipe the tested pump clean. If some parts cannot be wiped clean at one time, and "leakage" occurs after operation, it is allowed to be wiped clean again. a. Static seal: Press clean absorbent paper on the static seal part, and then remove it. If there is oil stain on the paper, it is oil leakage. b. Dynamic seal: Place white paper under the dynamic seal part. If there are oil drops on the paper within the specified time, it is oil leakage. Note: The continuous operation test time or number refers to the cumulative value after deducting the failure time or number that is not related to the tested pump. 5.3 Factory test. The factory test items and methods are specified in Table 5. Table 5
Test items
Displacement test
Volumetric efficiency test
Variable characteristic test
Overload test
Impact test
External leakage inspection test
Content and method
Measure displacement at maximum displacement, rated speed and no-load pressure.Measure volumetric efficiency at rated working conditions
At rated speed, make the variable mechanism of the tested pump reciprocate for 3 times in full stroke.Under the working conditions of maximum displacement, rated speed, maximum pressure or 125% of rated pressure (the higher one is selected), operate continuously for not less than 1min.Test according to the corresponding method specified in the type test, and the number of impacts shall not be less than 10 times
In the above-mentioned whole test process, check the dynamic and static sealing parts, and there shall be no external leakage
Note: The factory test allows the test speed to replace the rated speed. The test speed can be determined by the enterprise according to the test conditions. Data processing and result expression
6.1 Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power;
Input mechanical power;
In the formula: 9v2.
JB/T70441993
Vae-9v.e / ne
9v2,s /n
=P2e×4Ple×4c ×10%
P2.e×gv2e
2 yuan.
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; Input flow at test pressure, L/min; Speed at test pressure, r/min;
Speed at no-load pressure, r/min;
Displacement at test pressure, mL/r;
No-load displacement at no-load pressure, mL/r; Output test pressure, kPa;
Input pressure, positive if greater than atmospheric pressure, negative if less than atmospheric pressure, kPa; T
Input torque, N
Characteristic curve
Characteristic curves refer to Appendix A (reference) Figure A3~Figure A8.7
Test circuit
A1.1 See Figure A1 for the schematic diagram of the open test circuit. A1.2
See Figure A2 for the schematic diagram of the closed test circuit.
Characteristic curve
Volume efficiency and other efficiency curves refer to Figure A3.
Total efficiency and equal efficiency curves are shown in Figure A4.
A2.3 performance curve is shown in Figure A5.
Characteristic curve is shown in Figure A6.
Constant power characteristic curve is shown in Figure A7.
Impact waveform is shown in Figure A8.
JB/T70441993
Appendix A
Test circuit and characteristic curve
(reference part）
Drainage position
Replacement position
(L/min）
(Output flow)
9·q-2
(Output flow)
JB/T 70441993
P<input rate）
Output pressure》
P:(output power)
P:(output pressure）
(%)
(L/min)
Transfer a(t/min）
@=×× C
Yuli^(MPa)
Additional Notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard is drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 101Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power;
Input mechanical power;
In the formula: 9v2.
JB/T70441993
Vae-9v.e / ne
9v2,s /n
=P2e×4Ple×4c ×10%
P2.e×gv2e
2 yuan.
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; Input flow at test pressure, L/min; Speed at test pressure, r/min;
Speed at no-load pressure, r/min;
Displacement at test pressure, mL/r;
No-load displacement at no-load pressure, mL/r; Output test pressure, kPa;
Input pressure, positive if greater than atmospheric pressure, negative if less than atmospheric pressure, kPa; T
Input torque, N
Characteristic curve
Characteristic curves refer to Appendix A (reference) Figure A3~Figure A8.7
Test circuit
A1.1 See Figure A1 for the schematic diagram of the open test circuit. A1.2
See Figure A2 for the schematic diagram of the closed test circuit.
Characteristic curve
Volume efficiency and other efficiency curves refer to Figure A3.
Total efficiency and equal efficiency curves are shown in Figure A4.
A2.3 performance curve is shown in Figure A5.
Characteristic curve is shown in Figure A6.
Constant power characteristic curve is shown in Figure A7.
Impact waveform is shown in Figure A8.
JB/T70441993
Appendix A
Test circuit and characteristic curve
(reference part）
Drainage position
Replacement position
(L/min）
(Output flow)
9·q-2
(Output flow)
JB/T 70441993
P<input rate）
Output pressure》
P:(output power)
P:(output pressure）
(%)
(L/min)
Transformation a(t/min）
@=×× C
Yuli^(MPa)
Additional Notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard is drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 101Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power;
Input mechanical power;
In the formula: 9v2.
JB/T70441993
Vae-9v.e / ne
9v2,s /n
=P2e×4Ple×4c ×10%
P2.e×gv2e
2 yuan.
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; Input flow at test pressure, L/min; Speed at test pressure, r/min;
Speed at no-load pressure, r/min;
Displacement at test pressure, mL/r;
No-load displacement at no-load pressure, mL/r; Output test pressure, kPa;
Input pressure, positive if greater than atmospheric pressure, negative if less than atmospheric pressure, kPa; T
Input torque, N
Characteristic curve
Characteristic curves refer to Appendix A (reference) Figure A3~Figure A8.7
Test circuit
A1.1 See Figure A1 for the schematic diagram of the open test circuit. A1.2
See Figure A2 for the schematic diagram of the closed test circuit.
Characteristic curve
Volume efficiency and other efficiency curves refer to Figure A3.
Total efficiency and equal efficiency curves are shown in Figure A4.
A2.3 performance curve is shown in Figure A5.
Characteristic curve is shown in Figure A6.
Constant power characteristic curve is shown in Figure A7.
Impact waveform is shown in Figure A8.
JB/T70441993
Appendix A
Test circuit and characteristic curve
(reference part）
Drainage position
Replacement position
(L/min）
(Output flow)
9·q-2
(Output flow)
JB/T 70441993
P<input rate）
Output pressure》
P:(output power)
P:(output pressure）
(%)
(L/min)
Transfer a(t/min）
@=×× C
Yuli^(MPa)
Additional Notes:
JB/T70441993
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. >T/3
This standard was drafted by the National Hydraulic Components Quality Supervision and Inspection Center, the Jinan Foundry and Forging Machinery Research Institute of the Ministry of Machinery Industry, and the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard are Peng Ping, Xu Shengwu, He Guomin, Zhu Peihua, and Yin Guohui. 10
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