Piston disk spring safety valve features

The piston type disc spring safety valve is also called a spring safety valve with an external load. This kind of safety valve is developed on the basis of the general spring-loaded safety valve. The main features are two: First, the spring is changed into a disk shape; second, the upper part of the valve stem is equipped with a piston, and the compressed air can be used to push the piston up and down. . In addition to controlling the starting pressure of the safety valve by the compression degree of the spring, the safety valve can also push the piston to control its movement through compressed air.

In the normal operation of the boiler, the safety valve presses the valve core on the valve seat in addition to the spring, and the compressed air acts on the pressure on the upper part of the piston to press the valve core. This does not improve the tightness of the safety valve. Reduce leakage and extend usage. When the boiler pressure rises to the pressure of the safety valve, under the action of compressed air, the safety valve will quickly open and release steam. When the pressure is reduced, the compressed air can be switched to the upper part of the piston to close the safety valve. Because the safety valve can be quickly opened and closed, the degree of blow-off of the sealing surface during the opening and closing process can be avoided or reduced.

The piston type disc spring safety valve has the advantages of being sensitive to opening and closing, good tightness, long service life, etc. It is used in some large-capacity boilers.