Freeze protection device

Details Freeze protection device Freeze protection device

1989-01-06

1989-07-18

Chambers, A. Michael

Fluid handling

Ambient condition change responsive

Atmospheric

137 62, 137 79, 137357, 137468, F16K 1738

Patent

active

048483893

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.

REFERENCES:
patent: 1526718 (1925-02-01), Opp
patent: 3369556 (1968-02-01), Allderdice
patent: 3812872 (1974-05-01), Block et al.
patent: 4133338 (1979-01-01), Honikman
patent: 4460007 (1984-07-01), Pirkle
patent: 4730637 (1988-03-01), White

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