| 摘要 |
A fail-safe thermostat includes a stationary valve member configured to be positioned between conduit components of the engine cooling system, a movable valve member for engaging the valve seat to block fluid flow into the conduit through the opening, an operating spring for biasing the movable valve member to a closed position against the valve seat of the stationary valve member, and a thermally responsive actuator for moving the movable valve member to an open position away from a valve seat when the ambient temperature exceeds a first predetermined temperature to permit fluid flow into the conduit. The apparatus further includes a bimetallic frame member coupled the stationary valve member. The frame member is configured to compress and hold the operating spring in engagement with the movable valve member. The frame member is configured to disengage itself from the stationary valve member when the ambient temperature exceeds a second predetermined temperature and upon failure of the movable valve member to move to its the open position.
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