4674564 VALVE RELIEF For HITACHI ZX490H-5A 6WG1T

It can be automatically opened and closed according to the working pressure of the system, and is generally installed on the equipment or pipeline of the closed system to protect the safety of the system. When the pressure in the equipment or pipeline exceeds the set pressure of the pressure relief valve, the pressure relief will be automatically opened to ensure that the pressure of the medium in the equipment and pipeline is below the set pressure, so as to protect the equipment and pipeline and prevent accidents.

The pressure relief valve is an important safety device, which is used to protect the pressure in the equipment and pipeline within the set pressure range and prevent accidents. When the pressure in the equipment or pipeline exceeds the set pressure of the pressure relief valve, the pressure relief valve will automatically open and release the excess pressure, thus protecting the system from accidents or failures due to excessive pressure. When the pressure in the system drops to a safe range, the pressure relief valve will automatically close to prevent gas or liquid from flowing out.

There are two main types of relief valve structures: spring type and lever type. Spring type means that the sealing between disc and valve seat depends on the force of spring. Lever type depends on the force of lever and heavy hammer. With the need of large capacity, there is another kind of pulse relief valve, also known as pilot relief valve, which consists of main relief valve and auxiliary valve. When the medium pressure in the pipeline exceeds the specified pressure value, the auxiliary valve is opened first, and the medium enters the main pressure relief valve along the conduit, and the main pressure relief valve is opened to reduce the increased medium pressure.