Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1997-05-30
1998-10-06
Ferensic, Denise L.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374895, 1375991, F16K 3112
Patent
active
058162860
ABSTRACT:
A pressure unloading pilot operated fluid pressure regulator having a throttling element for controlling fluid flow. A pilot amplifier senses regulator outlet pressure and supplies suitable loading pressure coupled from an inlet supply pressure line through a variable flow restrictor to the throttling element. A check valve has a preset differential pressure defined between the check valve inlet and outlet and is mounted in parallel flow with the flow restrictor to limit the maximum differential pressure across the throttling element to the preset differential pressure of the check valve.
REFERENCES:
patent: 1357837 (1920-11-01), Bouvier
patent: 2991796 (1961-07-01), Griswold
patent: 3592223 (1971-07-01), Reese
patent: 3669143 (1972-06-01), Reese
patent: 3977423 (1976-08-01), Clayton
patent: 4000754 (1977-01-01), Risk
patent: 4182360 (1980-01-01), Neff
patent: 4380250 (1983-04-01), Stoll
patent: 4669493 (1987-06-01), Kober
patent: 5348036 (1994-09-01), Oksanen
Fisher Controls Instruction Manual, Type 2ST Regulators, pp. 1-5, Aug. 1995.
Fisher Controls Bulletin 71.2:399A-161, Type 399A Regulator, pp. 1-11, Mar. 1996.
Bonzer William Jacob
Jensen Frank E.
Scott Gary L.
Farid Ramyar
Ferensic Denise L.
Fisher Controls International Inc.
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