First, the principle, structure plug-in connection, conical seals, pilot controlled the second, the use of a logic valve, valve application 2, application of pressure valve 3, the application of three-flow valve, troubleshooting 1, the loss of opening and closing logic functions, not actions reasonably incurred by the Department of Design trapping; spool stuck; 2, reverse open, closed loop design department can not reasonably reliable; stuck spool 3, the logic valve can not dwell with the spool and sleeve valve Face seal; seal damage; valve defect 4, switching speed is too fast or too slow mainly outside the control of pressure, valve export pressure, spring force, orifice size and harmonious relations between force 5, with the gap leaks inside and outside the cone surface fit the situation, such a seal is broken, failure causes, the phenomenon of cross-II, and summarize the main cause of failure to consider the internal moving parts component power and the resistance movement and the relationship between the size of 1, 2 oil mixed with air, oil pollution 3 , with the gap 4, the control of the introduction of oil or low pressure drain 5, the internal part of the damage
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