What is the reason for the leakage of the safety valve?

a. Damage to the safety valve seat or disc sealing surface
The damage to the sealing surface may be caused by the corrosion of the metal sealing surface by corrosive media; it may also be the dirt brought into the valve inlet cavity or sealing surface during installation of the safety valve and the dirt left in the safety valve during equipment installation. The welding slag, iron rust and various solid materials mixed in the medium in the imported pipeline or equipment are scars caused by the flow rate of the high-speed medium when the safety valve is discharged to the sealing surface.

b. Caused by improper installation of safety valve
Improper installation mainly refers to the leakage caused by the damage or deformation of the valve coaxiality caused by the uneven load caused by the incorrect installation of the safety valve inlet and outlet connecting pipes.

c. Caused by high temperature of safety valve
For safety valves used in high-temperature media or installed in high-temperature environments, uneven thermal expansion may occur around the surfacing layer of the valve seat or valve core sealing surface, and the stiffness of the spring will become soft after heating, the pre-tightening force will be reduced, and sealing will be brought about Leakage caused by a drop in specific pressure.

d. Improper selection of safety valve
When the opening pressure of the selected safety valve is too close to the actual working pressure of the equipment, the leakage of the valve may also be caused because the fluctuation range of the working pressure of the equipment is close to or exceeds the sealing pressure of the safety valve.

e. Dirt on the safety valve is clamped on the sealing surface
Due to improper assembly, the sealing surface is clamped with dirt or the equipment and managed dirt are clamped on the sealing surface, etc., will cause the valve to leak tightly.
www.hengjiafirefighting.com