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US 5,845,675 AGranted
Diaphragm/spring actuated pressure relief valve with pressure balanced outlet and fail-safe operation
OwnerJ. Yen Lighinventor
Life of this patent
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Abstract
A diaphragm/spring operated pressure relief valve having a sensing passage of substantially the same flow area as the outlet orifice of the valve whereby failure of either diaphragm results in "fail open" configuration. In addition the effective area of the balancing diaphragm is substantially the same as the seat area of the seat seal of the outlet orifice such that a pressure or vacuum on the valve outlet pushes or pulls equally on the balancing diaphragm and the valve seat seal thereby balancing the forces and keeping the valve stable.
Claims28
A diaphragm spring actuated pressure relief valve comprising:
- a body having an inlet and an outlet;
- an outlet orifice located within said body and having a flow area;
- a rectilinearly movable seat seal having a seat area aligned to cooperatively engage and close said outlet orifice;
- a stem mounted on said seat seal at a proximal end;
- a flexible balancing diaphragm attached to said stem;
- a flexible sensing diaphragm attached to said stem;
- a spring mounted to said sensing diaphragm in axial alignment with a distal portion of said stem and
- a sensing passage concurrently connecting said inlet with said balancing diaphragm and said sensing diaphragm;
- wherein said sensing passage has the same or larger flow area than said outlet orifice.
6 more elements
Dependencies are inferred from the claim text.