Abstract
Aiming at the pollution fault of aircraft hydraulic system caused by the abnormal wear of the two-way limit valve, the method combining theoretical analysis and numerical simulation is used for fault location analysis based on the structural characteristics of the two-way limit valve, and the effect of the main affecting factors, such as the fitting size between parts and the position deviation of the filter holes, on the wear is studied. The results show that the wear of the two-way limit valve is mainly caused by axial assembly gap inside the product, and assembly gap greater than 0.019mm will cause abnormal wear. To solve the problem, it is suggested that no axial assembly gap will be controlled for subsequent product assembly. The two-way limit valve after 100 times of bidirectional alternating pressure supply test has normal performance and no wear phenomenon occurs.
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