Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1979-10-03
1981-10-20
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
251 61, F16K 31365
Patent
active
042954894
ABSTRACT:
A pilot-operated back pressure regulator of simplified design and construction having a balanced valve plug attached to a diaphragm actuator and secured to the regulator body by bolts for ready simultaneous removal of the plug and actuator. The diaphragm divides the actuator into two cavities; a spring cavity acting to close the valve plug and pressure balancing cavity. A pilot valve is in communication with the inlet pressure to the regulator body, the spring cavity and an exhaust to regulate the inlet pressure to flex the diaphragm. In a preferred embodiment O-ring seals are located between (a) the valve plug and the valve seat, (b) the valve plug and its guide, and (c) the valve plug guide and the regulator body.
REFERENCES:
patent: 2895501 (1950-07-01), Irwin
patent: 3001550 (1961-09-01), Engel
patent: 3032054 (1962-05-01), Irwin
patent: 3097664 (1963-07-01), Henley
patent: 3572382 (1971-03-01), Luthe
patent: 3722860 (1973-03-01), Curran
patent: 4041973 (1977-08-01), Rice
patent: 4135696 (1979-01-01), Saarem
patent: 4167262 (1979-09-01), Lemmon
Fisher Controls Bulletin 71.2:310, dated Mar. 1974, "Type 310 Pilot Operated Gas Regulator".
Fisher Controls Bulletin 71.4:63EG, dated Apr. 1979, "Type 63EG and 1098-63EGR Pressure Relief Valves".
Kimray Inc. Catalogue, Section A, pp. 1-18, "Regulators-Gas Pilot Operated-125 lb. WP".
Fisher Controls Instruction Manual, Form 1856, Aug. 1975, "63F Series Back Pressure Regulators".
Arends Roger R.
Bailey Wayne B.
Duffy John W.
Springer Brice D.
Cohan Alan
Fisher Controls Company, Inc.
Hoffman Arthur E.
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