JB/T 7174.2-1993 Diesel engine fuel injection pump oil delivery valve assembly performance test method JB/T7174.2-1993 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7174.2-93
Diesel engine fuel injection pump oil delivery valve pair
Performance test method
1993-11-21 Issued
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1994-03-01
Mechanical Industry Standard of the People's Republic of China
Diesel engine fuel injection pump oil delivery valve pair
Performance test method
1 Subject content and scope of application
JB/T7174.2--93
This standard specifies the test method for the fuel delivery valve pair (hereinafter referred to as the fuel delivery valve pair) of medium and small power diesel engines. This standard applies to the oil outlet valve parts of medium and small power diesel engines. 2 Reference standards
GB252 Light diesel
3 Test methods
3.1 Sliding test of oil outlet valve parts bzxZ.net
After careful cleaning and lubrication with well-filtered No. 0 light diesel oil that meets the requirements of GB252, place the oil outlet valve parts in a vertical position. Pull out 1/3 of the length of the working surface of the oil outlet valve from the oil outlet valve seat, turn the oil outlet valve around the axis to any position, and after releasing it, the oil outlet valve can slide down the seat by its own weight without any obstruction. 3.2 Sealing test of the sealing cone surface of the oil outlet valve parts 3.2.1 Before the test, the oil outlet valve parts should be cleaned with clean No. 0 light diesel oil that meets the requirements of GB252, and blown with compressed air.
3.2.2 The clamping force acting on the oil outlet valve shall not exceed 44N. 3.2.3 The length of the gas collecting pipe of the test bench shall not exceed 300mm, the inner diameter shall be less than 5mm, and the depth of the outlet end of the gas collecting pipe inserted into the water surface shall not exceed 20mm
3.2.4 Each pair of oil outlet reading mating parts must be tested in three different matching positions. 3.2.5 Inject compressed air of not less than 0.4MPa and maintain for 10s without leakage. 3.3 Oil outlet wide offset parts diametrical sealing test
3.3.1 The diametrical sealing (interval) test of the oil outlet valve mating parts shall be compared with the interval value sample approved by the regulatory procedures. 3.3.2 Use a pneumatic measuring instrument to carry out the test. During the test, the oil outlet valve shall be slightly lifted, and the size shall not make the gap at the sealing cone surface affect the diametrical sealing test effect.
3.4 ​​Reliability test of oil outlet valve mating parts
The test method of oil outlet valve mating parts shall be in accordance with the provisions of Appendix A (supplement). Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994
A1 Test Sample
JB/T7174.2-93
Appendix A
Test Method for Pluggability of Oil Delivery Valve Pair
(Supplement)
A1.1 The oil delivery valve pair to be tested for reliability shall comply with the provisions of the product drawings and relevant technical documents, and shall be qualified by the factory inspection department.
A1.2. Sampling at the warehouse of the production plant or at the end of the production line, the sample matrix shall not be less than 90 pairs: sampling at the user or market, the number of sample matrix is ​​not limited.
A1.3 Random sampling of 8 pairs.
A2 Test Method
A2.1 The reliability test of the oil delivery valve pair is to put it into the injection slurry and perform cold drag operation on the indoor injection pump reliability test bench. A2.2 The reliability test of the oil delivery valve pair is carried out in the 750h timed tail test mode. A2.3 The reliability test conditions of the oil delivery valve pair are the same as those of the fuel injection. A2.4 If the oil delivery valve pair is damaged during the test, it is judged as a failure, and the test of the failed sample is stopped. A2.5 At the end of the 750h test, the sealing of the dimensional surface and the diameter of the oil delivery valve dummy should be checked. The sealing of the cone surface is tested according to the method in Article 3.2. If continuous bubbles appear on the dimensional surface, it is judged as a failure. a.
b. The sealing of the diameter is tested according to the method in Article 3.3. If the sealing value (interval) of the diameter is greater than the upper limit of the sealing value of the sample of the same product by more than 3um, it is judged as a failure.
A3 Time of failure
A3.1 If the failure can be discovered in time, the exact time of failure should be recorded. A3.2 For failures that cannot be discovered in time, determine the time of occurrence T according to formula (A1). It is known that n failures occur within the time interval (T.!t,), and the time of occurrence of the mth failure is: Tt-+-t
Additional instructions:
This standard is proposed and managed by Wuxi Oil Pump and Nozzle Research Institute of the Ministry of Machinery Industry. This standard is drafted by Wuxi Oil Pump and Nozzle Research Institute, Shanghai Internal Combustion Engine Research Institute and other units. The main drafter of this standard is Cao Huirong.
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