Freeze protection valve with improved resetting capability

Details Freeze protection valve with improved resetting capability Freeze protection valve with improved resetting capability

1983-04-29

1984-03-27

Walton, George L.

Fluid handling

Freeze condition responsive safety systems

Low temperature responsive drains

137 80, 137468, 236 90, 237 80, 251 11, 251 67, 251 74, 251294, 251297, E03B 712

Patent

active

044387776

ABSTRACT:
A freeze protection valve can be reset under cold ambient conditions without the need for artificial heating of the valve's temperature sensor. An auxiliary latch is used to hold the valve element closed. The auxiliary latch is automatically released as the primary latching mechanism of the valve becomes operative upon an increase in temperature of the liquid system served by the valve. Release of the auxiliary latch is effected by virtue of a small downward movement of the valve stem resulting from a camming action inherent in the operation of the valve's primary latch.
In one version of the valve, a simple, drop-away key temporarily holds the valve stem down until the primary latch becomes operative. In another version, the valve stem is reset remotely through a bowden wire, and the resetting mechanism automatically engages an auxiliary latch.

REFERENCES:
patent: 1849491 (1932-03-01), Kelley
patent: 2264655 (1941-12-01), Brackmann
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: 3115330 (1963-12-01), Dollison
patent: 4026465 (1977-05-01), Kenny
patent: 4361167 (1982-11-01), Harasewych
patent: 4398553 (1983-08-01), Perrine
Ogontz Controls Company "Self-Contained Fluid Temperature Sensing Valves"-Industrial Division-Bulletin F-200.

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