The areas that can be diagnosed in the hydraulic valve are listed below. When working on a specific machine, please refer to the machine's technical manual for more information. This article brings the trouble of hydraulic pressure control valve, directional control valve and flow control valve.
Troubleshooting the 1. pressure control valve:
1. Safety valve:
Due to low or unstable pressure on the relief valve, consider the following when troubleshooting:
1) The adjustment is incorrect.
2) Dirt, debris or burrs make the valve partially open.
3) The poppet or valve seat is worn or damaged.
4) The valve piston in the main body is stuck.
5) The spring is weak.
6) The end of the spring is damaged.
7) The valve in the valve body or on the valve is cocking.
8) The orifice or balance remains blocked.
When there is no pressure on the safety valve, please perform the following troubleshooting:
1) The orifice or balance hole is blocked.
2) The poppet valve is not seated.
3) valve loose.
4) The valve body is stuck in the valve body or on the cover.
5) The spring is broken.
6) Dirt, debris or burrs make the valve partially open.
7) The poppet or valve seat is worn or damaged.
8) The valve in the valve body or on the valve is cocking.
When troubleshooting safety valves, please consider the following factors because they can produce excessive noise or vibration:
1) Oil viscosity is too high.
2) poppet or valve seat is faulty or worn.
3) The pipeline pressure is too high.
4) The pressure setting is too close to the pressure setting of another valve in the circuit.
5) An inappropriate spring is used behind the valve.
When troubleshooting safety valves, please consider the following, because they cannot be adjusted correctly without excessive system pressure:
1) The spring is broken.
2) Spring fatigue.
3) The spring of the valve is incorrect.
4) The drain pipe is restricted.
When troubleshooting safety valves, consider the following, as they may overheat the system:
1) Continuous operation at the pressure relief setting.
2) The oil viscosity is too high.
3) Seat leakage.
2. Pressure reducing valve.
When performing a pressure failure on the pressure reducing valve, please consider the following factors because their pressure is unstable:
1) Dirt in oil.
2) poppet or valve seat wear.
3) The orifice or balance hole is restricted.
4) The valve core is bound in the valve body.
5) Drainage pipes cannot be freely opened to the reservoir.
6) The end of the spring is not square.
7) The spring of the valve is incorrect.
8) spring fatigue.
9) The valve needs to be adjusted.
10) The spool hole is worn.
3、压力顺序阀。
对压力顺序阀进行故障排除时，请考虑以下因素，因为该阀无法正常工作：
1）安装不正确。
2）调整不当。
3）弹簧坏了。
4）异物在柱塞座或孔口中。
5）垫圈漏气或吹气。
6）排水线堵塞。
7）阀盖未正确拧紧或安装错误。
8）阀芯磨损或划伤。
9）阀杆座磨损或划伤。
10）孔口太大，会导致操作混乱。
11）发生粘结是因为运动的零件上涂有油杂质（由于过热或使用了不合适的油）。
对压力顺序阀进行故障排除时，请考虑以下事项，因为次级操作过早移动：
1）阀门设置太低。
2）主缸上的负载过大。
3）主缸上有高惯性负载。
对压力顺序阀进行故障排除时，请注意以下事项，因为没有运动或辅助操作缓慢：
1）阀门设置过高。
2）安全阀设置与顺序阀的设置太接近。
3）阀芯束缚在阀体中。
4、卸荷阀。
在对这些阀门进行故障排除时，请考虑以下因素，因为阀门无法完全卸载泵：
1）阀门设置过高。
2）泵未达到卸荷阀压力。
3）阀芯束缚在阀体中。
二、方向控制阀的故障排除：
方向控制阀包括滑阀，旋转阀和止回阀。对这些阀门进行故障排除时，请考虑以下事项，因为换档有故障或不完全：
1）控制连杆磨损或有约束力。
2）先导压力不足。
3）电磁阀烧坏或故障。
4）对中弹簧损坏。
5）阀芯调整不正确。
在对方向控制阀进行故障排除时，请考虑以下因素，因为执行缸会蠕动或漂移：
1）阀芯未正确对中。
2）阀芯未完全移位。
3）阀芯已磨损。
4）泄漏通过气缸中的活塞。
5）阀座泄漏。
在对方向控制阀进行故障排除时，请考虑以下因素，因为在阀芯居中的情况下气缸负载会下降：
1）阀箱的管路松动。
2）锁定弹簧或插头上的O形圈泄漏。
3）锁定弹簧损坏。
4）安全阀泄漏。
在对方向控制阀进行故障排除时，请考虑以下因素，因为气缸负荷在升高时会略有下降：
1）单向阀弹簧或阀座有故障。
2）滑阀的位置调整不当。
在由于油加热而对方向控制阀进行故障排除时，请考虑以下事项（封闭式系统）：
1）阀座泄漏（压力或回油回路）。
2）阀门调整不正确。
三、流量控制阀的故障排除：
流量控制阀包括流量控制阀和分流阀。对这些阀门进行故障排除时，请考虑以下因素，因为流量会发生变化：
1）阀芯束缚在阀体中。
2）气缸或马达泄漏。
3）油粘度太高。
4）整个阀的压降不足。
5）油脏了。
由于压力不稳定而对体积控制阀进行故障排除时，请考虑以下事项：
1）阀门的提升阀芯或阀座磨损。
2）油脏了。
由于流量不当而对体积控制阀进行故障排除时，请考虑以下事项：
1）阀门调整不正确。
2）气门活塞行程受到限制。
3）通道或孔口受到限制。
4）阀门活塞已翘起。
5）安全阀泄漏。
6）油太热。
由于油会加热，在对体积控制阀进行故障排除时，请考虑以下事项：
1）泵速不正确。
2）液压功能处于释放状态。
3）连接错误。
[Introduction to Zhongyou Heavy Industry]]
Zhongyou Heavy Industry (Xingdi Machinery) is a forging equipment manufacturer focusing on fluid pressure forming technology. Since its establishment in 2007, Zhongyou Heavy Industry has been committed to the technological innovation and product development of internal high pressure forming. The main products range from the production of ordinary hydraulic equipment, now developed to the production, research and development of domestic top fluid pressure forming technology forging equipment.
Zhongyou Heavy Industry is a provider of advanced lightweight forming technology. From product research and development, equipment production, mold development, program customization, to final delivery and value-added services, we provide customers with not only a hydraulic equipment, but a Complete set of intelligent manufacturing and forming solutions.
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