Patent ID: 9416986
Filing Date: 2016-08-16
CPC Classification: E03C,E03F,F16K,F24F,Y10T

Claim Text:
1. A valve for a roof vent comprising: a housing configured to couple with a roof vent conduit, the housing including an inlet, an outlet, a circumferential valve seat, and a flow channel passing through the valve and through the valve seat; a flapper mounted within the housing and having a first side facing a first side of the valve and a second side facing a second side of the valve, the flapper biased toward a closed position in which a sealing portion on the first side of the flapper engages with the valve seat to thereby block at least a portion of backflow through the flow channel, wherein the flapper is configured such that a minimum pressure on the first side of the flapper moves the flapper to an open position in which gas can flow through the flow channel; a pressure equalization conduit fluidly connecting a first side of the valve on the first side of the flapper with a second side of the valve on the second side of the flapper; a valve member within the pressure equalization conduit, the valve member configured to move from a closed position that substantially blocks fluid transfer between the first and second sides of the valve to an open position when a pressure on the second side of the valve exceeds a first defined pressure, thereby allowing the pressure on the second side of the valve to bleed into the first side of the valve.