Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1989-03-27
1989-11-28
Walton, George L.
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
137 79, 137315, 138 32, 236100, 237 80, 251 74, 251291, 251297, 251 11, F16K 3164, F16K 1740, E03B 712
Patent
active
048830828
ABSTRACT:
A temperature-responsive valve comprises a pair of wax-filled thermal actuators connected in series and set to expand at different temperatures respectively at the high and low limits of a temperature range. In one version, a valve element is movable by the actuators through an orifice form one side thereof to the other, closing the orifice when in an intermediate position, and opening the orifice when one actuator expands and when the other actuator contracts. The actuators are both in contact with the fluid controlled by the valve in the first version. In a second version, one of the actuators is isolated from the controlled fluid and responsive to the ambient temperature. In a third version, the valve is a snap-action valve, in which the series actuators operate a cam which normally holds latching balls in a projecting condition in which they engage a detent to hold the valve element closed. The valve element snaps open and remains open when one of the actuators expands and also when the other actuator contracts.
REFERENCES:
patent: 2788176 (1957-04-01), Andersen
patent: 3313483 (1967-04-01), Nallinger
patent: 3768731 (1973-10-01), Lavado
patent: 3989058 (1976-11-01), Jackson et al.
patent: 4361167 (1982-11-01), Harasewych
patent: 4438777 (1984-03-01), Pirkle
patent: 4460007 (1984-07-01), Pirkle
patent: 4484594 (1984-11-01), Alderman
patent: 4606302 (1986-08-01), Huemer et al.
patent: 4809727 (1989-03-01), Chamberlin
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