Boiler combined safety / anti vacuum valve with 1/2 inch bsp thread

Boiler combined safety / anti vacuum valve with 1/2 inch bsp thread

Safety valves release the steam pressure from the boiler (usually if it reaches 1.6 bars) if the pressure stat or PID fails to cut off the element.

Anti vacuum valves allow oxygen to enter the boilers until pressure builds up in the boiler (i.e. as the temperature rises in the boiler the steam creates pressure). Once pressure builds, it pushes the valve up and shuts the valve allowing the boiler to pressurise.