Importance

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Abstract

A combination by-pass and check valve for use in a fluid flow system comprising a valve body having an inlet and outlet and a passage therethrough. A seat disposed in the valve body between the inlet and outlet for location of a check disc thereon, the disc and seat cooperating to prevent fluid flow from the outlet to the inlet. A sleeve having one or more orifices therein extends from the check disc and substantially surrounds a portion of a perforate tubular by-pass located intermediate the seating surface and the inlet. The orifices in the sleeve and the perforations in the by-pass are in at least partial alignment and communication when the disc is on the seat, permitting fluid flow through the by-pass. When fluid flow from the inlet to the outlet has raised the disc a substantial distance off the seat, the orifices in the sleeve are non-aligned with the perforations on the by-pass, preventing fluid flow through the by-pass.

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First Claim