Patent ID: 9139991
Filing Date: 2015-09-22
Classification: E03C,Y10T

Abstract:
1. A check valve for a floor drain comprising: a cylindrical body, including an inlet end and an opposed outlet end; a flapper mount connected to an inside surface of the cylindrical body; a flapper stop positioned on the inside surface of the cylindrical body between the flapper mount and the outlet end of the cylindrical body; and a relatively rigid flapper connected to said flapper mount, said flapper having a resilient hinge and reinforcing ridges to provide rigidity to said flapper, said flapper being rotatable from a first closed position engaged with the flapper stop, wherein the flapper is configured to move away from the flapper stop to allow liquid that enters the inlet to exit the check valve through the outlet and when in the closed position prevents backflow of gases, wherein the resilient hinge biases the flapper toward the closed position and the flapper is positioned at an angle within the cylindrical body with a fixed portion of the flapper positioned closer to the inlet of the cylindrical body and a free portion of the flapper positioned closer to the outlet end of the cylindrical body.