Large, durable hydraulic power units built to operate in a variety of environmental conditions will have many design features that differ from typical pumping systems.

Hydraulic cylinders are commonly used components in industrial production, and their quality has a crucial impact on the performance and service life of mechanical equipment. Therefore, ensuring the quality of hydraulic cylinders is an important aspect of improving the production efficiency and product quality of mechanical equipment.

Both ends of the main spool are affected by oil pressure, and the stiffness of the main valve spring is only very small. In this way, when the overflow flow changes and the spring compression changes, the pressure of the oil inlet changes little. Therefore, the pressure regulating performance of the pilot relief valve is better than that of the ordinary direct acting relief valve, but the pilot relief valve is a two-stage valve, its sensitivity is lower than that of the direct acting relief valve.