Hydraulic balance valve Excavator hydraulic cylinder valve core CKBB-XCN

Application of relief valve
(1) Pressure control overflow In the quantitative pump throttling speed regulating oil supply system, the overflow valve is used to discharge excess oil back to the tank, adjust the preload force of the spring, and adjust the working pressure of the system. At this time, the relief valve is in a normally open state.
(2) Safety protection In the quantitative pump or variable pump oil supply system, no excess oil needs to be discharged back to the tank, and the relief valve is in a normally closed state. Only when the system is overloaded, the relief valve is opened to prevent the system pressure from further increasing to ensure the safety of the system. The working pressure of the system is determined by the load.
(3) Realize remote pressure regulation or make the system unload the remote control port of the pilot relief valve and the remote pressure regulator or the fuel tank
To achieve remote voltage regulation and system unloading. Relief valve is a pressure limiting device used to protect hydraulic systems and components, including direct acting, differential, two-way relief valves, pilot relief valves.

Direct and differential characteristics: rapid response, pollution resistance, low leakage, low cost. Have the following
Common applications:
(1) As the main system relief valve, keep the oil relatively stable, or as a safety valve, so as to protect the parts
Prevent overload.
(2) The working oil port two-way relief valve is used to protect the cylinder or motor from overload.

Direct acting relief valves are generally only used in low pressure and small flow systems, or as pilot valves. Medium and high pressure systems
Generally, pilot operated relief valve is used.
The pilot operated relief valve consists of two parts: the main valve and the pilot valve. Pilot valves are similar to direct-acting relief valves, but one
Generally, it is a cone valve (or ball valve) shaped seat type structure. The main valve can be divided into one concentric structure and two concentric structures
And three concentric structure.