US Patent 10969029 Low particle protected flapper valve

Embodiments of the disclosure generally relate to a flapper valve. The flapper valve may be used with processing chambers, such as semiconductor substrate processing chambers. In one embodiment, a flapper valve includes a housing having a first opening at a first end thereof and a second opening at a second end thereof, a first flapper pivotably disposed in the housing, and a second flapper pivotably disposed in the housing. The first and second flappers are movable to selectively open and close at least one of the first opening and the second opening.