JB/T 10282-2001 Technical requirements for pilot valves for hydraulic excavators
Some standard content:
ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T10282-2001
Pilot valve for hydraulic excavatorsTechnical specifications
2001-06-22 Issued
China Machinery Industry Federation
2001-10-01 Implementation
JB/T10282—2001
Appendix A of this standard is a prompt appendix.
This standard is proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Fengyang Hydraulic General Factory, Shanghai Dongfang Hydraulic Parts Factory, Changchun Aviation Airborne Equipment Company.
Drafters of this standard: Liu Zongshou, Shao Yanping, Gu Zhigang, Yu Jiming. This standard is issued for the first time.
1 Scope
Machinery Industry Standard of the People's Republic of China
Pilot valve for hydraulic excavators
Technical specifications
Pilot valve for hydraulic excavatorsTedhnical specifications
JB/T10282—2001
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of pilot valves for hydraulic excavators. This standard applies to pilot valves for hydraulic excavators (hereinafter referred to as pilot valves) that use hydraulic oil or other mineral oils with equivalent performance as working media. Pilot valves of other models can also refer to this standard. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828—1987
GB/T 7935—1987
GB/T14039—1993
JB/T78581995
3 Technical requirements
3.1 General requirements
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) General technical conditions for hydraulic components
Hydraulic system working medium solid particle pollution level code Hydraulic component cleanliness assessment method and hydraulic component cleanliness index 3.1.1 Pilot valves shall comply with the provisions of this standard and be manufactured according to drawings and technical documents approved by the prescribed procedures. 3.1.2 Parts may be put into storage only after they have passed the inspection. Parts with deformation, scratches, bumps, rust, etc. that affect product quality shall not be used for assembly.
3.1.3 Outsourced and purchased parts shall have inspection certificates. Seals that are scratched, pulled, cut, aged, or have exceeded their validity period must not be used for assembly.
3.1.4 Parts should be free of burrs and cleaned carefully before assembly. 3.1.5 The outer surface of the pilot valve that has passed the test should be treated for rust prevention. 3.2 Performance in use
3.2.1 The basic parameters and performance indicators of the pilot valve should comply with the provisions of Table 1 Table 1 Basic parameters and performance indicators of pilot valves
Nominal pressure
Nominal flow
3.2.2 After assembly, the moving valve core should remain flexible and free of sticking. Approved by China Machinery Industry Federation on June 22, 2001 Pressure loss
Internal leakage
mL/min
Implemented on October 1, 2001
JB/T10282—2001
3.23 When moving the valve core, the oil pressure at the working port should rise or fall smoothly as the handle angle increases or decreases, and the control pressure characteristics should meet the specified requirements.
3.2.4 The pilot valve should be able to work normally within the range of -20~+80℃. 3.3 DurabilityWww.bzxZ.net
3.3.1 The cumulative number of reversing times of the pilot valve N≥250,000 times. 3.3.2 After the durability test, the internal leakage should not be greater than 1.5 times the specified value, and the parts should not have abnormal wear and other forms of damage. 3.4 Assembly quality
3.4.1 The technical requirements for pilot valve assembly shall comply with the provisions of 1.5~1.8 in GB/T7935-1987. 3.4.2 Internal cleanliness
The internal cleanliness detection method shall comply with the provisions of JB/T7858. The mass of dirt in the inner cavity shall not exceed 30mg. 3.5 Appearance requirements
The appearance requirements shall comply with the provisions of 1.9 and 1.10 in GB/T79351987. 4 Test methods
4.1 Test conditions
4.1.1 Test oil
4.1.1.1 Viscosity
It is stipulated that when the oil temperature is 40℃, the kinematic viscosity of the oil is (42~74)×10°m2/s (special requirements shall be specified separately). 4.1.1.2 Oil temperature
When conducting the test, unless otherwise specified, the oil temperature entering the pilot valve under test is specified as type inspection should be carried out at 50℃±2℃, and factory test should be carried out at 50℃±4℃.
4.1.1.3 Cleanliness level
The solid particle pollution level code of the test oil shall not be higher than the level code 19/16 specified in GB/T14039. 4.1.2 Test device
4.1.2.1 The schematic diagram of the test system is shown in Appendix A (Suggested Appendix) Figure Al. 4.1.2.2 The flow rate of the test device oil should be adjustable. 4.1.2.3 The inner diameter of the pipe and joint connected to the pilot valve under test should be consistent with the diameter of the pilot valve under test. 4.1.2.4 Instrument and meter accuracy
The accuracy of the test instruments and meters should be within the range specified in Table 2. The maximum range of the instrument shall not exceed 2 times the maximum parameter value of the pilot valve under test.
Table 2 Instrument and meter accuracy
Instrument and meter
Pressure gauge
Flow meter
Thermometer
Note: Type test adopts Class B accuracy, and export test adopts Class C accuracy4.1.3 Steady-state conditions
Measurement level and accuracy
JB/T10282-2001
Only when the average indicated value of the controlled parameter changes within the range of Table 3, the measured value of the test parameter is allowed to be recorded. Table 3 Permissible range of change of the average indicated value of the controlled parameterControlled parameter
Factory test
Factory test shall be carried out in accordance with the provisions of Table 4.
Test items
Control characteristics
Internal leakage
Pressure loss
Pressure resistance test
External leakage test
Type test
Type test shall be carried out in accordance with the provisions of Table 5.
Test items
Measurement accuracy level and allowable variation rangeB level
Table 4 Factory test items and methods
Test method
Test circuitAccording to Figure A1, KI is closed, K2 is opened, the relief valve is adjusted to the nominal pressure, the test valve is slowly and evenly operated, from zero to maximum and then from maximum to zero for one cycle, and the pilot valve-control port pressure and operating force change with the rotation angle of the operating handle.
Test circuitAccording to Figure AI, K1 is closed, K2 is opened, P port is passed with nominal pressure, the test valve is operated 30 times, and the leakage of each control port is measured after 3 minutes.
Test circuitAccording to Figure A1, K1 is opened, K2 is closed, the input flow rate is slowly increased from zero to the nominal flow rate, and the pressure loss under the nominal flow rate is measured.
Test circuit According to Figure A1, K1 is closed, K2 is opened, and 1.5 times the nominal pressure is passed to operate each control port respectively, and the pressure is maintained for 5 minutes.
Test circuit According to Figure AI, K1 and K2 are closed, T port is passed with 0.3MPa pressure, and the other ports are blocked. The test valve is operated 10 times and the pressure is maintained for 5 minutes.
Table 5 Type test items and methods
Test method
1. The control pressure and the corresponding rotation angle
range should meet the design requirements
2. The hysteresis loop is less than 0.15MPa
3.The operation should be easy and free
The internal leakage shall not exceed the specified value
The pressure loss shall not exceed the specified value
There shall be no external leakage, oil seepage, damage
, etc.
There shall be no external leakage, oil seepage, damage
, etc. (there shall be no leakage at the valve stem
Static test
Control characteristics
Pressure loss
Durability test
5 Inspection rules
Inspection classification
JB/ T10282—2001
Repeat factory test No. 2, 4 and 5, and the random test part is changed to mandatory test
The test method is the same as the factory test, but the relationship curve between the control port pressure and the operating force of the tested valve and the angle of the operating handle should be recorded with an XY recorder
The test method is the same as the factory test, but the relationship curve between the pressure loss and the flow should be recorded with an XY recorder. The test circuit is as shown in Figure Al. Close K1 and open K2 to pass the nominal pressure. Operate each control port and repeat the static test every 10,000 times Inspection
Product inspection is divided into type inspection and factory inspection. 5.1.1 Type inspection
Each index shall not be greater than the specified value
The characteristic curve shall meet the design requirements
The characteristic curve shall meet the design requirements
1Record the working times when each sealing part leaks oil2The internal leakage shall not be greater than 1.5 times the specified value3. Check the wear of parts after the test
Type inspection refers to the comprehensive assessment of product quality, that is, comprehensive inspection according to the technical requirements specified in this standard. Type inspection shall be carried out in any of the following cases:a) Trial type identification of new products or old products transferred to factory production:b) After formal production, if there are major changes in structure, materials, and processes, which may affect product performance:) During normal production, regular inspection (usually 5 years) or periodic inspection after a certain amount of cumulative production;d) When the product is resumed after a long period of suspension;e) When there is a large difference between the factory inspection result and the last type inspection result: When the national quality supervision agency proposes a type inspection requirement. 5.1.2 Factory Inspection
Factory inspection refers to the various inspections and samplings conducted before the product leaves the factory
The sampling plan for batch products shall be in accordance with GB/T2828. 5.2.1 Type Inspection
a) Qualified quality level (AQL value): 2.5: b) Sampling plan type: one normal sampling plan; Sample size: 5 units.
Note: The number of samples for durability inspection may be reduced as appropriate, but shall not be less than 2 units. 5.2.2 Internal Cleanliness Inspection
a) Qualified quality level (AQL value): 2.5; b) Sampling plan type: two normal sampling plans; c) Inspection level: general inspection level II. 5.2.3 Factory random inspection
a) Acceptable quality level (AQL value): 2.54
JB/T10282—2001
b) Sampling plan type: normal sampling plan once: e) Inspection level: general inspection level I. 5.3 Judgment rules
According to GB/T2828.
5.3.1- Secondary sampling plan
According to the results of sample inspection, if the number of unqualified (unqualified products) found in the sample is less than or equal to the qualified judgment number, it is judged as qualified: if the number of unqualified (unqualified products) found in the sample is greater than or equal to the unqualified judgment number, it is judged as unqualified. 5.3.2 Secondary sampling plan
According to the results of sample inspection, if the number of unqualified (unqualified products) found in the first sample is less than or equal to the first qualified judgment number, it is judged as qualified. If the number of unqualified products found in the first sample is greater than or equal to the first unqualified judgment number, it is judged as unqualified.
If the number of unqualified products found in the first sample is greater than the first qualified judgment number and less than the first unqualified judgment number, the second sample is selected for inspection. If the sum of the number of unqualified products found in the first and second samples is less than or equal to the second qualified judgment number, it is judged as qualified. If the sum of the number of unqualified products found in the first and second samples is greater than or equal to the second unqualified judgment number, it is judged as unqualified.
6 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of 1.9, 1.11 and Chapter 3 of GB/T79351987 5
JB/T10282-2001
Appendix A
(Suggested Appendix)
Test system and characteristic curve
The principle diagram of the test circuit of the pilot valve is shown in Figure A1. Or computer numerical integral system
XY function instrument
Re-pu power supply
Price displacement sensor
Integrated fake
Flow sensor
Flow disease
Density transformer
Extrusion sensor
The principle diagram of the test circuit of the pilot valve
2 The characteristic curve of the pilot valve control pressure is shown in Figure A2. A2
Note: The MN straight line segment is the theoretical pressure regulation range, and the two dotted lines show the allowable deviation of the control pressure. Figure A2 Pilot valve control pressure characteristic curve
Mechanical industry standard
Pilot valve for hydraulic excavator
JB/T10282-2001
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880×12301/16 Printing sheet 3/4 Number of words 14.000 First edition in August 2001 First printing in August 2001 Number of copies 1-500 Price 1200 yuan
No. 2001-125
Mechanical industry standard service website: http:/hvwwJB.ac.cn102 Secondary sampling plan
According to the results of the sample inspection, if the number of unqualified (unqualified products) found in the first sample is less than or equal to the first qualified judgment number, it is judged as qualified. If the number of unqualified (unqualified products) found in the first sample is greater than or equal to the first unqualified judgment number, it is judged as unqualified.
If the number of unqualified (unqualified products) found in the first sample is greater than the first qualified judgment number and less than the first unqualified judgment number, the second sample is drawn for inspection. If the sum of the number of unqualified (unqualified products) found in the first and second samples is less than or equal to the second qualified judgment number, it is judged as qualified. If the sum of the number of unqualified (unqualified products) found in the first and second samples is greater than or equal to the second unqualified judgment number, it is judged as unqualified.
6 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of 1.9, 1.11 and Chapter 3 of GB/T79351987 5
JB/T10282-2001
Appendix A
(Suggested Appendix)
Test system and characteristic curve
The principle diagram of the test circuit of the pilot valve is shown in Figure A1. Or computer numerical integral system
XY function instrument
Re-pu power supply
Price displacement sensor
Integrated fake
Flow sensor
Flow disease
Density transformer
Extrusion sensor
The principle diagram of the test circuit of the pilot valve
2 The characteristic curve of the pilot valve control pressure is shown in Figure A2. A2
Note: The MN straight line segment is the theoretical pressure regulation range, and the two dotted lines show the allowable deviation of the control pressure. Figure A2 Pilot valve control pressure characteristic curve
Mechanical industry standard
Pilot valve for hydraulic excavator
JB/T10282-2001
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880×12301/16 Printing sheet 3/4 Number of words 14.000 First edition in August 2001 First printing in August 2001 Number of copies 1-500 Price 1200 yuan
No. 2001-125
Mechanical industry standard service website: http:/hvwwJB.ac.cn102 Secondary sampling plan
According to the results of the sample inspection, if the number of unqualified (unqualified products) found in the first sample is less than or equal to the first qualified judgment number, it is judged as qualified. If the number of unqualified (unqualified products) found in the first sample is greater than or equal to the first unqualified judgment number, it is judged as unqualified.
If the number of unqualified (unqualified products) found in the first sample is greater than the first qualified judgment number and less than the first unqualified judgment number, the second sample is drawn for inspection. If the sum of the number of unqualified (unqualified products) found in the first and second samples is less than or equal to the second qualified judgment number, it is judged as qualified. If the sum of the number of unqualified (unqualified products) found in the first and second samples is greater than or equal to the second unqualified judgment number, it is judged as unqualified.
6 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of 1.9, 1.11 and Chapter 3 of GB/T79351987 5
JB/T10282-2001
Appendix A
(Suggested Appendix)
Test system and characteristic curve
The principle diagram of the test circuit of the pilot valve is shown in Figure A1. Or computer numerical integral system
XY function instrument
Re-pu power supply
Price displacement sensor
Integrated fake
Flow sensor
Flow disease
Density transformer
Extrusion sensor
The principle diagram of the test circuit of the pilot valve
2 The characteristic curve of the pilot valve control pressure is shown in Figure A2. A2
Note: The MN straight line segment is the theoretical pressure regulation range, and the two dotted lines show the allowable deviation of the control pressure. Figure A2 Pilot valve control pressure characteristic curve
Mechanical industry standard
Pilot valve for hydraulic excavator
JB/T10282-2001
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880×12301/16 Printing sheet 3/4 Number of words 14.000 First edition in August 2001 First printing in August 2001 Number of copies 1-500 Price 1200 yuan
No. 2001-125
Mechanical industry standard service website: http:/hvwwJB.ac.cn10
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