液压机保压具体来说就是当液压机作业时，由液压油泵供油到油缸，利用单向阀来进行保压，调节阀来控制油压。当超过设定的数值后，并门进行卸油，同时，来保持设定的压力。保压的主要作用就是低于设定的压力，通过油液在自行调节油泵油量来保持压力的稳定，调压阀是用来限制高压力，以免压力太高损坏设备。
四柱液压机在正常运行时，由于生产需要较长时间的保压，才能满足产品的需要，不过，常规的液压机保压时间都会在20到40分钟左右，就会出现掉压的情况，保压性能一旦较差就会无法满足产品的生产要求，那么液压机不保压，或者保压性能较差都是哪些原因造成的呢？如果在液压机的使用中，保压性能较差，或者不保压的话，具体原因有以下方面：
1, the solenoid valve internal serious wear, resulting in one-way performance deterioration, resulting in pressure holding performance is not good.
2, the filling valve is also a one-way valve, if the internal wear, or even deformation, the pressure holding performance will deteriorate.
3. The sealing ring in the hydraulic oil cylinder is seriously worn and aged, which is also one of the reasons for the deterioration of the pressure holding performance.
4. The hydraulic joint of the oil pipeline has oil leakage, which will also cause the pressure holding performance to deteriorate.
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