Diaphragm/spring actuated pressure relief valve with pressure ba

Details Diaphragm/spring actuated pressure relief valve with pressure ba Diaphragm/spring actuated pressure relief valve with pressure ba

1997-10-27

1998-12-08

Ferensic, Denise L.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137472, 251 88, F16K 1720

Patent

active

058456759

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.

REFERENCES:
patent: 2271516 (1942-02-01), Tobin et al.
patent: 2877978 (1959-03-01), Rider et al.
patent: 3075544 (1963-01-01), Heideman
patent: 3583432 (1971-06-01), Powell et al.
patent: 4312375 (1982-01-01), Leinemann
patent: 4368872 (1983-01-01), Machat
patent: 4445531 (1984-05-01), Powell
patent: 5163471 (1992-11-01), Powell
patent: 5249593 (1993-10-01), Higgins et al.
patent: 5253672 (1993-10-01), Uehara et al.

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