Fail-safe thermostat valve

Details Fail-safe thermostat valve Fail-safe thermostat valve

1993-11-24

1994-11-08

Tapolcai, Jr., William E.

Automatic temperature and humidity regulation

Cooling radiator

Bypass

137 72, 236DIG2, F01P 716

Patent

active

053619803

ABSTRACT:
A fail-safe thermostat valve for controlling the flow of coolant to an engine has, in addition to a thermostat element that expands and contracts to open and close the valve, a fusible element that supports an elevated plate that holds two springs. One spring holds the valve plate in its normally closed position. When the thermostat element fails, the fusible element melts and allows the second spring to force the elevated plate away from the valve seat and pull valve plate away from the valve seat as well. Thus, when the thermostat element fails, the valve will remain permanently open until it can be replaced.

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patent: 5109881 (1992-05-01), Baker
patent: 5174496 (1992-12-01), Bourgin
patent: 5188287 (1993-02-01), Chamot

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