Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7040-1993
Hydraulic Vane Pump
Issued on September 23, 1993
Test Method
Implementation on July 1, 1994
Ministry of Machinery Industry of the People's Republic of China
Machinery Industry Standard of the People's Republic of China
Hydraulic Vane Pump
1 Subject content and scope of application
This standard specifies the test method for hydraulic vane pumps. Test method
JB/T7040-1993
This standard applies to the test of hydraulic vane pumps using hydraulic oil or other mineral oils with equivalent performance as the working medium2
Referenced standards
GB2346
GB2347
GB3767
GB7935
GB7936
GB/T14039
3Terms and symbols||tt ||3.1 Terminology
Rated pressure
Hydraulic and pneumatic graphic symbols
Nominal pressure series of hydraulic pneumatic systems and components Nominal displacement series of hydraulic pumps and motors
Determination of sound power level of noise source Engineering method and quasi-engineering method General technical conditions of hydraulic components
Method for determination of no-load displacement of hydraulic pumps and motors Solid particle pollution level code of hydraulic system working medium Continuous operation within the specified speed range and the highest output pressure that can ensure the design life. 3.1.2 No-load pressure
Output pressure not exceeding 5% of the rated pressure or 0.5MPa. 3.1.3 Rated speed
The highest speed that can ensure the design life under the rated pressure and specified oil inlet conditions. 3.1.4 Minimum speed
The minimum speed allowed to maintain a stable output rated pressure. 3.1.5 Displacement
The volume of liquid discharged per revolution of the pump shaft.
3.1.6 No-load displacement
Displacement measured at no-load pressure.
3.1.7 Output characteristic curve
The curve of the relationship between output flow and output pressure. 3.1.8 Cut-off pressure
The pressure on the rated output characteristic curve that makes the output flow zero. 3.1.9 Hysteresis
Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
JB/T70401993
On the output characteristic curve, the ratio of the maximum value of the difference between the two pressures that produce the same flow to the cut-off pressure, expressed as a percentage. 3.1.10 Inflection point
The point on the output characteristic curve where the slope changes the most. 3.2 Symbols and units
See Table 1 for symbols and units.
Parameter name
Kinematic viscosity
Volumetric efficiency
Total efficiency
Vacuum degree
4 Test apparatus and test conditions
4.1 Test circuit
The schematic diagram of the test circuit is shown in Figure A1 and Figure A2.4.2
Location of measuring point
Unit name
Liter per minute
Milliliter per revolution
Revolution per minute
Newton meter
Degrees Celsius
Millimeter per second squared
4.2.1 Pressure measurement point: Set at (2~4)d (d is the pipe diameter) away from the inlet and outlet of the test pump. In steady-state test, it is allowed to move the measurement point farther away from the test pump, but the pressure loss of the pipeline must be considered. 4.2.2 Temperature measurement point: Set at a distance of (2~4)d from the pressure measurement point, farther away from the test pump than the pressure measurement point. 4.2.3
Noise measurement point: The location and number of the measurement points shall comply with the provisions of Article 6.5 of GB3767. 4.3 Test oil
4.3.1 Viscosity: The kinematic viscosity at 40℃ is 42~74mm2/s (special requirements shall be specified separately). 4.3.2
Oil temperature: Unless otherwise specified, type tests shall be conducted at 50±2℃; factory tests shall be conducted at 50±4℃. Cleanliness level: The solid particle pollution level code shall not be higher than 19/16. 4.4 Steady-state condition
The range of variation of the average display value of the parameter meets the provisions of Table 2. Under steady-state conditions, all parameters (pressure, flow, torque, speed, etc.) of each set point are measured simultaneously. 4.5 Measurement accuracy
The measurement accuracy level is divided into three levels: A, B and C. The allowable system error of the measurement system shall comply with the provisions of Table 3. 2
Measurement parameter
Pressure (gauge pressure p<0.2MPa)
Pressure (gauge pressure p>0.2MPa)
JB/T7040-1993
Accuracy level
Note: The type test shall not be lower than the B-level measurement accuracy; the factory test shall not be lower than the C-level measurement accuracy. Table 3
Measurement parameter
Pressure (gauge pressure p<0.2MPa)
Pressure (gauge pressure p≥0.2MPa)
Measurement accuracy level
Note: The type test shall not be lower than the B-level measurement accuracy; the factory test shall not be lower than the C-level measurement accuracy. Test items and test methods
5.1 Air tightness inspection and running-in
Air tightness inspection and running-in should be carried out before the test. c
Air tightness inspection: Fill the inner cavity of the pump under test with clean gas at a pressure of 0.16MPa, immerse it in the anti-rust liquid and stay for more than 1min. 5.1.1
Running-in: At the rated speed or test speed, load step by step from the no-load pressure and run-in in grades. Running-in time and pressure classification 5.1.2
Determined as needed, the running-in time at rated pressure (70% cut-off pressure for variable pump) shall not be less than 2min. 5.2
Type test
Type test items and methods shall be as specified in Table 4. 5.3 Factory test
Factory test items and methods shall be as specified in Table 5. 3
Test items
Displacement verification test
Efficiency test
Pressure swing inspection
Output characteristic test
Transient characteristic test
Self-priming test
Noise test
JB/T7040-1993
Content and method
Perform in accordance with the relevant provisions of GB7936
a. At rated speed, gradually increase the outlet pressure of the pump to about 25% of the rated pressure. After the operation is stable, start measuring. b. According to the above method, measure at least the groups of data when the outlet pressure of the pump is about 40%, 55%, 70%, 85%, 100% of the rated pressure (30%, 40%, 50%, 60%, 70% cut-off pressure for variable pumps). c. In the range of 85% of the rated speed of the tested pump to the minimum speed, set at least 4 evenly distributed test speeds, and measure the groups of data of the above test pressure points at each test speed. d. 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 (70% cut-off pressure for variable pumps) and draw the following characteristic curves:
a The efficiency curves at oil temperatures of 20~35℃ and 70~80℃ are shown in Figure A3b. The iso-efficiency characteristic curves are shown in Figure A4, Figure A5 or the performance curves are shown in Figure A6. A6
c. The characteristic curve or equivalent curve of flow rate, efficiency and power changing with pressure is shown in Figure A7
Under the conditions of maximum displacement, rated pressure and rated speed, observe and record the pump outlet pressure swing value
Under the conditions of maximum displacement and rated speed, adjust the load pressure to slowly rise to the cut-off pressure, and then slowly drop to the no-load pressure. Repeat 3 times to draw the output characteristic curve as shown in Figure A8
Under the conditions of maximum displacement and rated speed, adjust the pressure to the cut-off pressure, lock the adjustment mechanism, use step loading to make the flow rate from maximum to minimum, and then from minimum to maximum
Draw the waveform of instantaneous pressure and time function as shown in Figure A9 Determine the peak pressure Pmar, pressure pulsation △p, transition process time t response time t, and pressure overshoot §(pp.) Under the conditions of rated speed and no-load pressure, measure the displacement when the suction port vacuum is zero. Based on this, gradually increase the suction resistance until the displacement drops by 1%, and measure its vacuum degree. At rated speed, measure the noise values of at least 6 equally divided pressure points in the range from no-load pressure to rated pressure (the variable pump is the cut-off pressure). Remarks: Variable pump is tested at maximum displacement. Variable pump is tested for this item. a. Variable pump is tested for this item. b. No assessment item is done for the time being. Variable pump is tested for the maximum displacement. a.When the variable pump is tested at maximum displacement, the background noise should be at least 10dB (A) lower than the measured noise of the tested pump, otherwise the test items should be corrected and the low temperature test, high temperature test, overspeed test, overload test, impact test, full load test, efficiency inspection test, external leakage inspection test, JB/T7040-1993, Table 4 continued, content and method, the tested pump and inlet oil temperature are below -20℃. , start the test pump at no-load pressure, start it repeatedly 5 times
rated pressure (70% cut-off pressure for variable pump) and rated speed, when the inlet oil temperature is above 90℃, run continuously for 1h. At 115% of the rated speed, run continuously for 15min at rated pressure (70% cut-off pressure for variable pump) and no-load pressure. During the test, the inlet oil temperature of the test pump is 30~60℃a. Fixed displacement pump: at rated speed, run continuously at 125% of the rated pressure
b. Variable pump: adjust the variable mechanism to move the inflection point of the test pump to the cut-off pressure, and run continuously under the conditions of maximum displacement, rated speed and cut-off pressure. After the test, move the inflection point back to its original position. During the test, the inlet oil temperature of the tested pump is 30~60℃. At the rated speed, continuous impact is performed according to the following requirements: the impact frequency is greater than 10 times/min, the pressure holding time at the rated pressure (the variable pump is the cut-off pressure) is greater than T/3 (T is the cycle period), and the unloading pressure is lower than 10% of the rated pressure (the variable pump is the carrying pressure) (the impact waveform is shown in Figure A10)
At the rated pressure (70% cut-off pressure for the variable pump) and rated speed, perform continuous operation
During the test, the inlet oil temperature of the tested pump is 30~60°℃. After completing the above-mentioned specified test items, measure the volumetric efficiency and total efficiency at the rated pressure (70% cut-off pressure for the variable pump) and rated speed. Wipe the tested component clean. If some parts cannot be wiped clean at one time and "false" leakage occurs after operation, it is allowed to be wiped clean again. a. Static seal: Press clean absorbent paper against 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. If there are oil drops on the paper within the specified time, it means oil leakage.
Note: Items 10, 11, and 12 belong to durability test items. Remarks
a. Test the variable pump at maximum displacement
b. Perform this test when required
Test the variable pump at maximum displacement
Test the variable pump at maximum displacement
Test the variable pump at maximum displacement
Test items
Displacement inspection test
Volumetric efficiency test
Pressure swing inspection
Output characteristic test
Overload test
Impact test
External leakage inspection
Data processing and result expression
6.1 Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power:
Input mechanical power:
Where: 921
JB/T7040—1993
Content and method
Carry out in accordance with the relevant provisions of GB7936
At rated pressure (70% of the carrying pressure for variable pumps) and rated speed Measure the volumetric efficiency at the maximum displacement, rated pressure and rated speed. Observe and record the pump outlet pressure swing value at the maximum displacement, rated speed. Adjust the load pressure to slowly rise to the cut-off pressure, and then slowly drop to the no-load pressure. Repeat 3 times to draw the output characteristic curve as shown in Figure A8. Run continuously at 125% of the rated pressure for 1 minute at the rated speed. Impact continuously for more than 10 times at the rated speed according to the following requirements; the impact frequency is greater than 10 times/min, and the cut-off pressure is maintained. The pressure time is greater than T/3 (T is the cycle period), and the unloading pressure is lower than 10% of the cut-off pressure (the impact waveform is shown in Figure A10)
Wipe the test component clean. If some parts cannot be wiped clean at one time, "false" leakage will occur 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.
V2e_9v2e / ne
P2e×9v2e- Ple ×4vle ×100% 2mT
P2.×qv2.c
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; 2mT
Verify maximum displacement of variable pump
Test variable pump at maximum displacement
This test is performed on variable pump
This test is performed on fixed-displacement pump
This test is performed on variable pump
JB/T70401993
Input flow at test pressure, L/min; Rotation speed at test pressure, r/min;|| tt||V2, e
Speed at no-load pressure, r/min;
Effective 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
For the characteristic curve, see Appendix A (reference) Figures A3 to A10. 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.
JB/T7040-1993
Appendix A
Test circuit and characteristic curve
(reference part)
Replacement position
Open test circuit
Closed test circuit
Characteristic curve
The curve of efficiency changing with pressure is shown in Figure A3.
The curve of volumetric efficiency and equal efficiency is shown in Figure A4.
The curve of total efficiency and equal efficiency is shown in Figure A5.
The performance curve of A2.4 is shown in Figure A6.
The characteristic curve is shown in Figure A7.
Replacement position
The output characteristic curve is shown in Figure A8.
The curve of instantaneous pressure and time is shown in Figure A9.
The impact waveform is shown in Figure A10.
（Transport over the mountain belt
JB/T70401993
（Output volume
Efficiency curve with pressure change
P input power》
Internal output pressure
Total efficiency and other efficiency curves
(/min)
(L/min）
P:(auxiliary output work)
Output pressure）
Volume efficiency and other efficiency curves
nfr fmia )
ptMPa)
Characteristic curve
Performance curve
aPressure limit variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
dConstant power variable
Figure A10Impact waveform(Auxiliary output)
Output pressure)
Volumetric efficiency and other efficiency curves
nfr fmia)
ptMPa)
Characteristic curve
Performance curve
aPressure limit variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
dConstant power variable
Figure A10Impact waveform(Auxiliary output)
Output pressure)
Volumetric efficiency and other efficiency curves
nfr fmia)
ptMPa)
Characteristic curve
Performance curve
a Pressure-limiting variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8 Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
d Constant power variable
Figure A10 Impact waveformStatic seal: Press clean absorbent paper against the static seal, then remove it. If there is oil stain on the paper, it is oil seepage.
b. Dynamic seal: Place white paper under the dynamic seal. If there is oil drop on the paper within the specified time, it is oil leakage.
Note: Items 10, 11, and 12 belong to durability test items. Remarks
a. Test the variable pump at maximum displacement
b. Perform this test when required
Test the variable pump at maximum displacement
Test the variable pump at maximum displacement
Test the variable pump at maximum displacement
Test items
Displacement inspection test
Volumetric efficiency test
Pressure swing inspection
Output characteristic test
Overload test
Impact test
External leakage inspection
Data processing and result expression
6.1 Calculation formula
Volumetric efficiency:
Total efficiency:
Output hydraulic power:
Input mechanical power:
Where: 921
JB/T7040—1993
Content and method
Carry out in accordance with the relevant provisions of GB7936
At rated pressure (70% of the carrying pressure for variable pumps) and rated speed Measure the volumetric efficiency at the maximum displacement, rated pressure and rated speed. Observe and record the pump outlet pressure swing value at the maximum displacement, rated speed. Adjust the load pressure to slowly rise to the cut-off pressure, and then slowly drop to the no-load pressure. Repeat 3 times to draw the output characteristic curve as shown in Figure A8. Run continuously at 125% of the rated pressure for 1 minute at the rated speed. Impact continuously for more than 10 times at the rated speed according to the following requirements; the impact frequency is greater than 10 times/min, and the cut-off pressure is maintained. The pressure time is greater than T/3 (T is the cycle period), and the unloading pressure is lower than 10% of the cut-off pressure (the impact waveform is shown in Figure A10)
Wipe the test component clean. If some parts cannot be wiped clean at one time, "false" leakage will occur 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.
V2e_9v2e / ne
P2e×9v2e- Ple ×4vle ×100% 2mT
P2.×qv2.c
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; 2mT
Verify maximum displacement of variable pump
Test variable pump at maximum displacement
This test is performed on variable pump
This test is performed on fixed-displacement pump
This test is performed on variable pump
JB/T70401993
Input flow at test pressure, L/min; Rotation speed at test pressure, r/min;|| tt||V2, e
Speed at no-load pressure, r/min;
Effective 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
For the characteristic curve, see Appendix A (reference) Figures A3 to A10. 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.
JB/T7040-1993
Appendix A
Test circuit and characteristic curve
(reference part)
Replacement position
Open test circuit
Closed test circuit
Characteristic curve
The curve of efficiency changing with pressure is shown in Figure A3.
The curve of volumetric efficiency and equal efficiency is shown in Figure A4.
The curve of total efficiency and equal efficiency is shown in Figure A5.
The performance curve of A2.4 is shown in Figure A6.
The characteristic curve is shown in Figure A7.
Replacement position
The output characteristic curve is shown in Figure A8.
The curve of instantaneous pressure and time is shown in Figure A9.
The impact waveform is shown in Figure A10.
（Transport over the mountain belt
JB/T70401993
（Output volume
Efficiency curve with pressure change
P input power》
Internal output pressure
Total efficiency and other efficiency curves
(/min)
(L/min）
P:(auxiliary output work)
Output pressure）
Volume efficiency and other efficiency curves
nfr fmia )
ptMPa)
Characteristic curve
Performance curve
aPressure limit variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
dConstant power variable
Figure A10Impact waveformStatic seal: Press clean absorbent paper against the static seal, then remove it. If there is oil stain on the paper, it is oil seepage.
b. Dynamic seal: Place white paper under the dynamic seal. If there is oil drop on the paper within the specified time, it is oil leakage.
Note: Items 10, 11, and 12 belong to durability test items. Remarks
a. Test the variable pump at maximum displacement
b. Perform this test when required
Test the variable pump at maximum displacement
Test the variable pump at maximum displacement
Test the variable pump at maximum displacement
Test items
Displacement inspection test
Volumetric efficiency test
Pressure swing inspection
Output characteristic test
Overload test
Impact test
External leakage inspection
Data processing and result expression
6.1 Calculation formula
Volumetric efficiency:wwW.bzxz.Net
Total efficiency:
Output hydraulic power:
Input mechanical power:
Where: 921
JB/T7040—1993
Content and method
Carry out in accordance with the relevant provisions of GB7936
At rated pressure (70% of the carrying pressure for variable pumps) and rated speed Measure the volumetric efficiency at the maximum displacement, rated pressure and rated speed. Observe and record the pump outlet pressure swing value at the maximum displacement, rated speed. Adjust the load pressure to slowly rise to the cut-off pressure, and then slowly drop to the no-load pressure. Repeat 3 times to draw the output characteristic curve as shown in Figure A8. Run continuously at 125% of the rated pressure for 1 minute at the rated speed. Impact continuously for more than 10 times at the rated speed according to the following requirements; the impact frequency is greater than 10 times/min, and the cut-off pressure is maintained. The pressure time is greater than T/3 (T is the cycle period), and the unloading pressure is lower than 10% of the cut-off pressure (the impact waveform is shown in Figure A10)
Wipe the test component clean. If some parts cannot be wiped clean at one time, "false" leakage will occur 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.
V2e_9v2e / ne
P2e×9v2e- Ple ×4vle ×100% 2mT
P2.×qv2.c
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; 2mT
Verify maximum displacement of variable pump
Test variable pump at maximum displacement
This test is performed on variable pump
This test is performed on fixed-displacement pump
This test is performed on variable pump
JB/T70401993
Input flow at test pressure, L/min; Rotation speed at test pressure, r/min;|| tt||V2, e
Speed at no-load pressure, r/min;
Effective 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
For the characteristic curve, see Appendix A (reference) Figures A3 to A10. 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.
JB/T7040-1993
Appendix A
Test circuit and characteristic curve
(reference part)
Replacement position
Open test circuit
Closed test circuit
Characteristic curve
The curve of efficiency changing with pressure is shown in Figure A3.
The curve of volumetric efficiency and equal efficiency is shown in Figure A4.
The curve of total efficiency and equal efficiency is shown in Figure A5.
The performance curve of A2.4 is shown in Figure A6.
The characteristic curve is shown in Figure A7.
Replacement position
The output characteristic curve is shown in Figure A8.
The curve of instantaneous pressure and time is shown in Figure A9.
The impact waveform is shown in Figure A10.
（Transport over the mountain belt
JB/T70401993
（Output volume
Efficiency curve with pressure change
P input power》
Internal output pressure
Total efficiency and other efficiency curves
(/min)
(L/min）
P:(auxiliary output work)
Output pressure）
Volume efficiency and other efficiency curves
nfr fmia )
ptMPa)
Characteristic curve
Performance curve
aPressure limit variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
dConstant power variable
Figure A10Impact waveformc
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; 2mT
Verify maximum displacement of variable pump
Test variable pump at maximum displacement
Variable pump performs this test
Dosed pump performs this test
Variable pump performs this test
JB/T70401993
Input flow at test pressure, L/min; Speed at test pressure, r/min;
V2, e| |tt||Speed at no-load pressure, r/min;
Effective 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
For the characteristic curve, see Figure A3 to Figure A10 in Appendix A (reference part). 7
Test circuit
A1.1See 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.
JB/T7040-1993
Appendix A
Test circuit and characteristic curve
(reference part)
Replacement position
Open test circuit
Closed test circuit
Characteristic curve
The curve of efficiency changing with pressure is shown in Figure A3.
The curve of volumetric efficiency and equal efficiency is shown in Figure A4.
The curve of total efficiency and equal efficiency is shown in Figure A5.
The performance curve of A2.4 is shown in Figure A6.
The characteristic curve is shown in Figure A7.
Replacement position
The output characteristic curve is shown in Figure A8.
The curve of instantaneous pressure and time is shown in Figure A9.
The impact waveform is shown in Figure A10.
（Transport over the mountain belt
JB/T70401993
（Output volume
Efficiency curve with pressure change
P input power》
Internal output pressure
Total efficiency and other efficiency curves
(/min)
(L/min）
P:(auxiliary output work)
Output pressure）
Volume efficiency and other efficiency curves
nfr fmia )
ptMPa)
Characteristic curve
Performance curve
aPressure limit variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
dConstant power variable
Figure A10Impact waveformc
Output flow at no-load pressure, L/min; Output flow at test pressure, L/min; 2mT
Verify maximum displacement of variable pump
Test variable pump at maximum displacement
The variable pump performs this test
The fixed-displacement pump performs this test
The variable pump performs this test
JB/T70401993
Input flow at test pressure, L/min; Speed at test pressure, r/min;
V2, e| |tt||Speed at no-load pressure, r/min;
Effective 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
For the characteristic curve, see Figure A3 to Figure A10 in Appendix A (reference part). 7
Test circuit
A1.1See 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.
JB/T7040-1993
Appendix A
Test circuit and characteristic curve
(reference part)
Replacement position
Open test circuit
Closed test circuit
Characteristic curve
The curve of efficiency changing with pressure is shown in Figure A3.
The curve of volumetric efficiency and equal efficiency is shown in Figure A4.
The curve of total efficiency and equal efficiency is shown in Figure A5.
The performance curve of A2.4 is shown in Figure A6.
The characteristic curve is shown in Figure A7.
Replacement position
The output characteristic curve is shown in Figure A8.
The curve of instantaneous pressure and time is shown in Figure A9.
The impact waveform is shown in Figure A10.
（Transport over the mountain belt
JB/T70401993
（Output volume
Efficiency curve with pressure change
P input power》
Internal output pressure
Total efficiency and other efficiency curves
(/min)
(L/min）
P:(auxiliary output work)
Output pressure）
Volume efficiency and other efficiency curves
nfr fmia )
ptMPa)
Characteristic curve
Performance curve
aPressure limit variable
Constant flow variable
JB/T70401993
Equal load variable
Figure A8Output characteristic curve
Instantaneous pressure and time curve
Constant pressure variable
dConstant power variable
Figure A10Impact waveform
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