Fluid handling – Ambient condition change responsive – Atmospheric
Patent
1983-01-25
1984-07-17
Chambers, A. Michael
Fluid handling
Ambient condition change responsive
Atmospheric
137 62, 251 11, 251 62, 251 67, 251 74, 251297, 236 48R, E03B 710, F16K 1738
Patent
active
044600070
ABSTRACT:
In a freeze protection valve, a wax actuator is situated in a heat-conductive housing to which heat is conducted from the liquid system being protected. The housing prevents the actuator from triggering the valve to its opened condition while the liquid system is hot, but permits a rapid response when the liquid system is cool. In a snap-action freeze protection valve, the actuator is carried by the valve stem, and heat is conducted from the valve body to the valve stem through a sleeve through which the valve stem slides. The actuator moves a cam within the valve stem which operates a ball-type latch. The latch holds the valve in the closed position until the actuator releases the latch.
Also disclosed is a remote-controlled valve operating mechanism which uses an electrically heated wax actuator to effect valve closure. A cam and ball mechanism relieves the force on the actuator piston as soon as valve closure takes place, thereby preventing failure of the actuator due to prolonged application of high pressures and temperatures.
REFERENCES:
patent: 1468068 (1923-09-01), Hanson
patent: 1526718 (1925-02-01), Opp
patent: 2547853 (1951-04-01), Butterfield
patent: 2688460 (1954-09-01), Borgerd
patent: 2716418 (1955-08-01), Borgerd
patent: 2822693 (1958-02-01), Mulsow
patent: 3040772 (1962-06-01), Todd
patent: 3385559 (1968-05-01), Churchill
patent: 4026465 (1977-05-01), Kenny
patent: 4066091 (1978-06-01), Itoh et al.
patent: 4173986 (1979-11-01), Martin
patent: 4361167 (1982-11-01), Harasewych
patent: 4398553 (1983-08-01), Perrine
Ogontz Industrial Division Bulletin F-200, Ogontz Controls Co.
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