Hardware spring-type safety valve mainly by the spool, valve seat, stem, spring, adjust the screw and other components. This safety valve is mainly the use of metal spring elastic, the valve core pressure on the valve seat. When the boiler pressure exceeds the pressure acting on the upper part of the spool when the pressure is lower than the pressure acting on the upper part of the spool, the spool is pressed against the valve seat, and when the pressure of the boiler is lower than the pressure acting on the upper part of the spool, The boiler stops exhaust.
Spool and valve seat contact surface for the cone, spool around the edge of a little out. When the steam top of the spool, the spool edge is also subject to vapor pressure, so that the entire area of the role of a sudden increase in the safety valve suddenly opened; when the reduction in force, due to a sudden reduction in steam force, To prevent the spool repeatedly beating. The main parameters of the spring-type safety valve is to open the pressure and exhaust capacity, and the exhaust capacity depends on the valve seat diameter and spool lifting height. As the lifting height of the different, can be divided into micro-Kai, Kai Kai and Quan Kai-type safety valve three.
Hardware spring-type safety valve compact structure, small size, light; tightness is good, and easy to adjust, stand the vibration, there is little leakage of the phenomenon. Therefore, sensitive and reliable. It is the most widely used, is the most commonly used one.