Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1988-03-01
1989-11-07
Chambers, A. Michael
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
137 79, 137341, 251 74, 251297, 236 48R, E03B 710, F16K 1738
Patent
active
048785121
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: 3618890 (1971-11-01), Bastam
patent: 4066091 (1978-06-01), Itoh et al.
patent: 4361167 (1982-11-01), Harasewych
Chambers A. Michael
Ogontz Controls Company
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