| CPC F16K 15/144 (2013.01) [F04B 53/1047 (2013.01); F16K 25/04 (2013.01)] | 20 Claims |
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1. A valve for controlling fluid flow, the valve comprising:
a first plate comprising a plurality of first holes extending through said first plate;
a second plate comprising a plurality of second holes extending through said second plate, the plurality of second holes being substantially offset from the plurality of first holes of said first plate;
wherein said first plate and said second plate are arranged to form a cavity therebetween in fluid communication with the plurality of first holes of said first plate and the plurality of second holes of said second plate; and
a flap disposed and moveable between said first plate and said second plate, said flap having holes substantially offset from the plurality of first holes of said first plate and substantially aligned with the plurality of second holes of said second plate;
wherein said flap is operable to be motivated between said first and second plates in response to a change in direction of differential pressure of the fluid across the valve;
wherein said first plate comprises a coating disposed on a surface of the first plate;
wherein the first plate comprises a plurality of clearance regions, substantially aligned with the holes of the flap, in which a thickness of the coating is reduced; and
wherein each of the plurality of clearance regions defines a respective inner region in which a thickness of the coating is generally greater than its defining clearance region.
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