Hydraulic balance valve Excavator hydraulic cylinder valve core CBGB-XCN

Structure of the relief valve

   The relief valve is composed of a valve body, a spool, a spring and a regulating device. Among them, the valve body is the main part of the relief valve
It is usually cast steel or cast aluminum. The spool is a valve located in the body, usually made of steel or copper. play
The spring is used to adjust the opening pressure and closing pressure of the spool. The regulating device is used to adjust the pretension of the spring
Force, which affects the closing pressure of the spool.
During the operation of the relief valve, the liquid flows into the valve body from the inlet and flows out through the gap between the spool
When the pressure exceeds the preset value, the spool will automatically open, and the pressure beyond the preset value will be discharged through the overflow port. Dang Press
When the force falls below the preset value, the spool will automatically close.
The working principle of the relief valve
When the hydraulic oil in the system flows to the relief valve, the velocity and flow rate of the hydraulic oil are controlled by the spool
. If the hydraulic oil pressure is higher than the opening pressure of the spool, the spool will automatically open, and the hydraulic oil flow beyond the preset value will be discharged through the overflow port. If the hydraulic oil pressure is lower than the spool closing pressure, the spool automatically closes, preventing the opening of the overflow port. Therefore, the design and adjustment of the opening pressure and closing pressure of the spool is very important, which will affect the working performance and maximum working pressure of the relief valve.