Fluid handling – Line condition change responsive valves – Fluid opened valve requiring reset
Patent
1995-09-05
1997-12-09
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
Fluid opened valve requiring reset
13750513, 137517, F16K 1700
Patent
active
056949774
ABSTRACT:
A simple and highly reliable automatic valve is disclosed which is enabled y being subjected to a predetermined pressure and actuated as pressure is reduced from that pressure. A pressure differential of several orders of magnitude between enablement pressure and actuation pressure can be obtained by providing non-linear or plural springs which oppose fluid pressure against a reciprocable piston. The piston includes an aperture or passage which seals against a surrounding bore when the valve is closed. The piston is maintained in a position where the aperture or passage is sealed against the bore by a latch. The latch comprises a band spring held in position by a protrusion on the piston and released when the piston is moved by a predetermined fluid pressure. Fine adjustment of both enablement and actuation pressures is provided.
REFERENCES:
patent: 2245271 (1941-06-01), Guill
patent: 2927603 (1960-03-01), Willis
patent: 3698424 (1972-10-01), Wiegand
patent: 3768436 (1973-10-01), Martini
Hepperle Stephen M.
Kasischke James M.
Lall Prithvi C.
McGowan Michael J.
The United States of America as represented by the Secretary of
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