Abstract: An automatic shutoff valve that can be easily installed in a swimming pool skimmer, that will prevent the flow of air through the suction outlet when the water level drops below the minimum level required to maintain buoyancy of the automatic shutoff valve's float. The valve is designed to automatically reset to normal when a sufficient level of liquid is restored in the pool and skimmer assembly, and any suction acting on the outflow portion of the valve is briefly interrupted to release the float from its position on the valve seat. During operation, the valve protects the pool's circulating pump from damage that could result from becoming air-bound ad losing its prime, as a result of sucking air through the skimmer's bottom outlet.

Abstract: An automatic shutoff valve that can be easily installed in a swimming pool scupper, or provided as original equipment at time of scupper installation. The automatic shutoff valve will stop the normal flow of liquid through a drain or suction outlet when the liquid level drops below the minimum level required to maintain buoyancy of the automatic shutoff valve's float, and the flow is about to change from liquid to gaseous. The valve is designed to automatically reset to normal when a sufficient level of liquid is restored in the pool and scupper assembly, and any suction acting on the outflow portion of the valve is briefly interrupted to release the float from its position on the valve seat. The valve incorporates a valve body with a valve seat, float retainer, and a buoyant float which can reciprocate vertically, being guided by the retainer as it descends onto the sealing surface located below it.