This standard specifies the test method for hydraulic isolated accumulators. This standard is applicable to accumulators with a nominal pressure of 6.3~63MPa, a nominal volume of 0.25~250L, an operating temperature of -10~70℃, and a petroleum-based hydraulic oil or emulsion as the working medium. JB/T 7037-1993 Test method for hydraulic isolated accumulators JB/T7037-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7037-1993
Hydraulic isolated accumulator
Published on September 23, 1993
Ministry of Machinery Industry of the People's Republic of China
Test method
Implementation on July 1, 1994
Mechanical Industry Standard of the People's Republic of China
Hydraulic isolated accumulator
1 Subject content and scope of application
Test method
This standard specifies the test method for hydraulic isolated accumulators (hereinafter referred to as accumulators). JB/T7037-1993
This standard is applicable to accumulators with a nominal pressure of 6.3~63MPa, a nominal volume of 0.25~250L, a petroleum-based hydraulic oil or emulsion as the working medium, and a working temperature of -10~70℃. 2 Reference standards
GB3868
JB/T7038
JB/JO2050.2
Symbols and units
Technical conditions for hydraulic isolated accumulator capsulesTechnical conditions for hydraulic isolated accumulator shellsTest methods for internal cleanliness of hydraulic componentsPart 2Symbols and units are shown in Table 1.
Test apparatus and test conditions
4.1 Test circuit
Kinematic viscosity
The principle of a typical hydraulic test circuit is shown in the figure. 4.2 Location of measuring points
Weighing method (trial)
Unit name
Liter per minute
Degrees Celsius
Square meters per second
4.2.1 The pressure measurement point should be set at (2~4)d (d is the pipe diameter) away from the input (or output) of the test piece. During steady-state testing, it is allowed to move the measuring point farther from the test piece, but the pressure loss of the pipeline should be considered. 4.2.2 The temperature measurement point should be set at (2~4)d away from the pressure measurement point (farther away from the test piece). 4.3 Test oil
4.3.1 Viscosity: At 40℃, the kinematic viscosity is 42-74mm2/s (special requirements are specified separately). 4.3.2 Oil temperature: Except for special requirements, the oil temperature at the inlet of the test piece is specified to be 50℃. Type tests should be carried out at 50±2℃; factory tests should be carried out at 50±4℃.
4.3.3 Cleanliness: The solid particle contamination level code of the test oil shall not be higher than 19/16. Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
4.4 Measurement accuracy
Measurement accuracy level
JB/T 70371993
Salt test piece
Zone w
Schematic diagram of hydraulic test circuit
The measurement accuracy is divided into three levels: A, B and C. The measurement accuracy of type inspection shall not be lower than level B, and the measurement accuracy of factory test shall not be lower than level C.
Allowable systematic error of measurement system
The allowable systematic error of measurement system shall comply with the provisions of Table 2. Table 2
Measurement parameters
Pressure%
Flow%
Temperature℃
Measurement accuracy level
Note: The limits listed in the table refer to the allowable limits of the measured values, not the maximum values ​​of the test measurements or the allowable limits of the maximum readings of the instruments. 4.5
Steady-state conditions
When the average indicated value of the controlled parameter changes within the range specified in Table 3, it is a steady-state condition. Under steady-state conditions, it is allowed to measure each parameter at each set
point.
Controlled parameters
Pressure%
Flow%
Temperature℃
Measurement accuracy level
Test items and methods
Type test items and methods are specified in Table 4. No.
Test Item
Capsule Air Tightness Test
Accumulator Sealing and
Pressure Test
Accumulator Repeated Action
Air Leakage Check
Oil Seepage Check
Disassembly Check
Internal Cleanliness Check
JB/T70371993
Test Method
Open the accumulator oil port to the atmosphere, and fill the accumulator capsule with nitrogen (or air) at 0.85 times the nominal pressure from the charging valve port. Record the pressure gauge value at ambient temperature, and check for leakage after maintaining the pressure for 12 hours. Install the accumulator in the test system and conduct the test as specified in the table below. Check the leakage and oil seepage of each seal
Bladder accumulator
Type B diaphragm accumulator
Type A and C diaphragm accumulator
Nominal pressure
Charging pressure
Test pressure
Pressure holding time
Install the accumulator in the test system and conduct the test according to the test stages in the table below. After the end of the 1st and 2nd stages and after every 20,000 actions in the 3rd stage, use the charging tool to measure the charging pressure value, and check the oil seepage of each seal frequently
Nominal pressure
Repeated action
Charging pressure
Action pressure
(0.1~1) p
Charging and discharging frequency
After the repeated action test, the accumulator is charged with nitrogen (or air) again to make its pressure 0.85 times the nominal pressure. Immerse in water, maintain pressure for not less than 1 hour, check for air leakage. After the air leakage inspection, release the gas in the accumulator capsule, remove the charging valve, apply pressure oil with nominal pressure from the oil port, maintain pressure for not less than 1 hour, and observe whether there is oil leakage at the charging valve seat. After the above test, dismantle the accumulator and check each part according to the provisions of JB/JQ20502. The factory test items and methods are specified in Table 5. 5.2
5.3 The test items and methods of the capsule shall be in accordance with the provisions of GB3868. 5.4 The test items and methods of the shell shall be in accordance with the provisions of JB/T7038. 3
Test items
Accumulator sealing and
Pressure test
Accumulator action test
Additional instructions:
JB/T70371993
Install the accumulator in the test system and conduct the test as specified in the table below. Check for air leakage and oil seepage at each seal during the pressure holding time.
Bladder accumulator
Type B diaphragm accumulator
Type A and C diaphragm accumulator
Nominal pressure
Charging pressure
Test pressure
Pressure holding time
Perform an action test as specified in the table below.
Check during the action test
After the sealing test, check the leakage and oil seepage of each seal and whether the oil inlet valve is stuck. Nominal pressure
Inflating pressure
Actuation pressure
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. This standard is drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Nie Yanhong and Wang Ying. Number of actions
Charge and discharge frequency
Sampling test (the number of samples is
25% of the number of batches)
Standard of the Machinery Industry of the People's Republic of China
Hydraulic isolation accumulator
Test method
JB/T 70371993
Published by the China Academy of Mechanical Sciencewww.bzxz.net
Printed by the China Academy of Mechanical Science
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1/16 Printing Sheet 1/2
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Word Count 8,000
First Edition in May 1994
First Printing in May 1994
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Price 3.00 Yuan
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