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US 5,392,810 AGranted
Plates for wafer check valves
AssigneeGoodwin International Limited
InventorsJames N. Cooper, Nicholas J. Harrop
Life of this patent
Estimating the term…
Abstract
A metal plate 20 for a dual plate wafer check valve. A central portion 36 of the D shaped plate 20 is reinforced such as by means of a raised area 36 on either or both sides of the plate to resist deformation when subjected to reverse pressure in the valve closed position, while the D shaped edge portion 32 of the plate is made sufficiently flexible to maintain or improve sealing engagement with a valve seat even when the valve seat is distorted by the effect of reverse pressure in the valve closed position.
Claims11
A metal plate for a dual plate check valve comprising:
- a substantially D-shaped plate member, said D-shaped plate member having a predetermined thickness with a central portion and end portions extending from the central portion, means for pivotally mounting said plate for rotation about an axis parallel to and adjacent a straight edge of the D, said central portion including a reinforcement increasing the thickness of the plate in the central portion, when back pressure acts on said plate, said reinforcement limiting bowing of said D-shaped plate member and said plate distorting which enables the end portions of the plate to maintain sealing contact with a seat.
A check valve comprising:
- a valve body;
- a valve seat having an upstream and a downstream side comprising:
- an annular seat member;
- and
- a diametral cross member
- said annular seat member and said diametral cross member defining a pair of substantially D shaped apertures
- a diametral hinge pin arranged parallel to said diametral cross member of said valve seat on the downstream side thereof
- a pair of substantially D shaped plates pivotally connected to said diametral hinge pin and having an upstream side and a downstream side
- said plates being pivotable between a valve open position to a valve closed position, said D shaped plate member having a predetermined thickness with a centrally located portion and end portions extending from the central portion, means for pivotally mounting said plate for rotation about said hinge pine, said central portion including a reinforcement increasing the thickness of the plate in the central portion, when back pressure acts on said plate, said reinforcement limiting bowing of said D shaped plate member, and said plate distorting which the end portions of plate to maintain sealing contact with a seat.
6 more elements
Dependencies are inferred from the claim text.