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A hydraulic pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure through regulation, and relies on the energy of the fluid itself to maintain the outlet pressure stable automatically. This article, brought to you by Xingdiyuan Machinery, covers the common faults of hydraulic pressure reducing valves and their diagnostic methods. I. Fault symptoms of hydraulic pressure reducing valve 1: http://www.yeyajichangjia.com/uploads/200305/1-200305144940311.jpg – Unable to reduce pressure or no secondary pressure. Cause of failure: The oil drain port is blocked or the oil drain passage is obstructed, causing the main valve spool to get stuck in its original position and unable to close; the pilot valve is also blocked. Exclusion method: Check the oil drain pipeline, oil drain port, pilot valve, main spool, and check valve, and repair them as necessary. Check and rule out mechanical interference with the actuator. II. Fault symptoms of the hydraulic pressure reducing valve II: The secondary pressure cannot continue to increase or the pressure is unstable. Cause of failure: The pilot valve does not seal properly, the main valve spool is stuck in a certain position, and there are mechanical disturbances in the load. Exclusion method: Check the oil drain pipeline, oil drain port, pilot valve, main spool, and check valve, and repair them as necessary. Check and rule out mechanical interference with the actuator. III. Fault symptoms of hydraulic pressure reducing valves: http://www.yeyajichangjia.com/uploads/200305/1-200305145010118.jpg During the pressure regulation process, the pressure does not rise and fall continuously, but rather decreases in an uneven manner. Cause of failure: The voltage-regulating spring is bent or broken. Exclusion method: Disassemble, inspect, and replace.