This standard specifies the test methods for hydraulic gear pumps. This standard applies to hydraulic gear pumps that use hydraulic oil or other mineral oils with equivalent performance as the working medium. JB/T 7042-1993 Test methods for hydraulic gear pumps JB/T7042-1993 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7042-93
Hydraulic gear pump
Published on September 23, 1993
Test methodbzxz.net
Implementation 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 gear pump
1 Subject content and scope of application
This standard specifies the test method for hydraulic gear pumps. Test method
JB/T 7042-93
This standard is not applicable to the test of hydraulic gear pumps with hydraulic oil or other mineral oils of equivalent performance as the working medium. 2 Reference standards
GB2346
GB2347
GB3767
GB7935
GB7936
3 Terms and symbols
3.1 Terms
Hydraulic and pneumatic graphic symbols
Hydraulic and pneumatic systems and components Nominal pressure series Hydraulic tickets and motor nominal displacement series
Determination of sound power level of noise source Engineering method and quasi-engineering method General technical conditions for wave pressure components
Hydraulic tickets, motor no-load displacement determination method 3.1.1 Rated pressure
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 Maximum pressure
The maximum output pressure allowed for short-term operation. 3.1.4 Nominal speed
The highest nominal speed that can guarantee 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 Nominal displacement
The nominal displacement of the product.
3.1.8 No-load displacement
The displacement measured at no-load pressure.
3.1.9 Rated operating conditions
The operating conditions at rated pressure and nominal speed. 3.2 Symbols and units
See Table 1 for symbols and units.
Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
Parameter name
Delivery sugar content
Passenger volume efficiency
Total efficiency
Vacuum degree
Test apparatus and test conditions
Test circuit
JB/T7042-93
See Appendix A (reference) for the schematic diagram of the test circuit. 4.2 Measurement point location
Unit name
Liter per minute
Liter per revolution
Revolution per minute
Newton meter
Degree Celsius
Quadratic meter per second
4.2.1 Pressure measurement point: Set at (2~4)d (d is the pipe diameter) from the inlet and outlet of the test pump. During steady-state test, the measurement point can be moved farther away from the test pump, but the pressure loss of the pipeline must be considered. 4.2.2
Temperature measurement point: Set at (2~4)d from the pressure measurement point, farther away from the test pump than the pressure measurement point. Noise measurement point: The location and number of measurement points shall comply with the provisions of Article 6.5 of GB3767. 4.2.3
4.3 Test oil
Viscosity: The kinematic viscosity at 40°C is 4274mm*/s (special requirements shall be specified separately). 4.3.2
Moisture: Unless otherwise specified, type tests shall be carried out at 50±2°C; factory tests shall be carried out at 50±4°C. Clearness: The solid particle contamination level code of the test oil shall not be higher than 19/16.4.4
Steady-state condition
The steady-state condition is when the variation range of the average displayed 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. Table 2
Pressure (gauge pressure p
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