Hydraulic balance valve Excavator hydraulic cylinder valve core PVDB-LWN

Working principle of direct acting relief valve

1. Pressure balance: the valve body of the direct-acting relief valve is equipped with a sealing kit. When the pressure exceeds the set value of the system, the sealing kit will produce a force, pushing the spool and the pressure rod to the opposite direction;
2. Motion principle: If the pressure is higher than the set value of the system, the pressure rod will pass through the valve body, so that the spool is pushed open, and a part of the hydraulic oil is discharged from the overflow port;
3. Control principle: When the pressure is lower than the set value of the system, the pressure rod will be pulled by the piston and return to the return in time, so that the valve core is re-stuck, so as to avoid the hydraulic oil flow out of the overflow port and the system disconnection ability;

The characteristics of direct acting relief valve
1. Fast response: the direct-acting relief valve adopts the principle of pressure balance, which can quickly respond to changes in the occasion;
2. Safe and reliable: the direct-acting relief valve can also operate stably within a large pressure range, which can effectively protect the safety of the system;
3. Simple maintenance: direct acting relief valve only needs to be tested regularly, no regular replacement of parts is required, and maintenance is relatively simple;
4. Low noise: Direct acting relief valve adopts pressure balance control principle, regulating the closing process is more gentle, can reduce noise, suitable for high noise environment.