Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1988-05-16
1989-03-28
Walton, George L.
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
137 60, 137 79, 137315, 236100, 236DIG2, 237 80, 251 74, 251149, 251297, F16K 3164, F16K 1740, E03B 712
Patent
active
048154911
ABSTRACT:
For freeze protection of a water line, a T fitting in the line is provided with a removable threaded bushing having a plug with radially projecting balls which engage J-shaped slots in the bushing to provide a bayonet joint. The plug is released when freezing conditions threaten by retraction of the balls in response to movement of a cam inside the plug by a thermal actuator also inside the plug. A check valve in the T fitting is closed automatically when the threaded bushing is removed. Modified versions include a plug having dual actuators in series, a plug combined with a flanged bushing for use in freeze protection of a compressor head, a plug combined with a valve to provide a snap-action drain valve with a more easily replaceable actuator assembly, and a plug using a water-filled glass vial as an actuator. A building protection system and a locomotive coolant system, both use freeze protection devices in accordance with the invention.
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patent: 4438777 (1984-03-01), Pirkle
patent: 4460007 (1984-07-01), Pirkle
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