Abstract: An improved floor drain valve for buildings, basements, exterior paved areas, and the like. The invention provides floor drain assemblies and check valves providing improved drainage performance, particularly where drainage is an irregular occurrence, and having unprecedented simplicity and reliability. Floor drains according to the invention comprise check valves having elastomeric hinge structures mounting relatively rigid flapper structures biased upwardly against sealing surfaces adapted for disposition within floor drains. Water entering the valve structure opens the flapper valves by gravitational forces downwardly against the relatively rigid flapper, and after passage of the water, the valve is elastomerically urged into the sealed position restricting back flow of gases from the downstream area of the drain conduit and permitting pressure testing of the downstream conduit.

Abstract: An improved gasket for floor drain valve for buildings, basements, exterior paved areas, and the like. The invention provides a gasket positioned around the outside of check valves providing sealing engagement and support for said drain valve within a conduit. The gasket provides outwardly directed vanes for some four and sealing of the valve to the interior of the conduit. In one embodiment the vanes are connected together form an inflatable chamber extending about the periphery of the gasket which cavity is accessed by an inflation needle from the upper surface of said gasket so that air or other gases under pressure may be forced into the inflatable cavity causing the wall of said cavity to engage the interior surface of the conduit thereby sealing and supporting the drain valve. Provision is made for locking the drain valves in operative position within said conduit.

Abstract: An improved floor drain valve for buildings, basements, exterior paved areas, and the like. The invention provides floor drain assemblies and check valves providing improved drainage performance, particularly where drainage is an irregular occurrence. and having unprecedented simplicity and reliability. Floor drains according to the invention comprise check valves having elastomeric hinge structures mounting relatively rigid flapper structures biased upwardly against sealing surfaces adapted for disposition within floor drains. Water entering the valve structure opens the flapper valves by gravitational forces downwardly against the relatively rigid flapper, and after passage of the water, the valve is elastomerically urged into the sealed position restricting back flow of gases from the downstream area of the drain conduit and permitting pressure testing of the downstream conduit.