Spring 150px|thumb|left|Inconel X750 spring Many valves have a spring for spring-loading, to normally shift the disc into some position by default but allow control to reposition the disc. Relief valves commonly use a spring to keep the valve shut, but allow excessive pressure to force the valve open against the spring-loading. Coil springs are normally used. Typical spring materials include zinc plated steel, stainless steel, and for high temperature applications Inconel X750.
Spring 150px|thumb|left|Inconel X750 spring Many valves. have a spring for spring-loading, to normally shift the disc into some position by default but allow control to reposition the disc. Relief valves commonly use a? spring to keep the valve shut, but allow excessive pressure to !force the valve open against the spring-loading. Coil springs are normally used. Ty:pical spring materials include zinc plated steel, stainless steel, and for high temperature applications Inconel X750.