Air and Vacuum Valves

Functions of the Air and Vacuum Valve

The Air and Vacuum Unit, with its orifice the same diameter as the inlet, allows large quantities of air to be vented from systems being filled with liquid and the same holds true in reverse for vacuum conditions when the system is drained.

It’s design is such that the velocity of air passing through the valve will not blow the float shut at normal design volumes.  It will not close until the arrival of liquid in the valve and will not open to vent accumulating air as long as the system is still under pressure and in operation.  The Air and Vacuum valve on this page is available with a stainless steel float and either standard top or protectop in sizes up to and including 24” inlets.