Degassing valves are typically installed on a T-connection at the highest point in the piping system with the discharge port piped back to the supply tank or other safe location. In applications using chemicals that typically outgas, degassing valves can be installed on both the inlet and discharge side of the pump for maximum venting.

When the system is operational, process fluid fills the valve chamber which raises an internal float to seal the discharge port (closed valve). As the fluid outgasses and excess gas accumulates in the chamber, the float drops to open the valve. Fluid pressure then pushes the gas out through the open discharge port and back to the supply tank. Once accumulated gas is vented, the float rises again to close the valve. This process repeats automatically to safely and efficiently vent excess gas or vapor from the system.