The opening and closing action of spring type safety valve depends on the change of medium pressure at the inlet end and the pre tightening force of spring to make the valve core open and close automatically. When the medium pressure (internal pressure) rises to a higher lifting force than the spring preload, the valve core will automatically open against the spring preload and release the redundant medium, so that the internal pressure will drop. Also, due to the spring force, when the internal pressure falls to the safety value, the valve core will automatically close and the release will stop.

What is the pressure level range of spring safety valve?

The pressure range of spring safety valve is divided into the valve body pressure range, i.e. the nominal pressure shall not exceed the valve body pressure from the lowest to the highest. The setting pressure range is based on three pressure differences of the setting pressure. The setting pressure of spring safety valve with lower starting pressure shall be 1.12 times of the working pressure and shall not be less than the working pressure plus 0.07MPa; the starting pressure The setting pressure of the higher spring safety valve shall be 1.14 times of the working pressure and shall not be less than the working pressure plus 0.1MPa.