| 摘要 |
In a pump housing having a valve for controlling the flow of pressurized fluid therethrough, a valve element is pivotally mounted in the housing, adjacent the outlet, for pivotal movement within the housing between a first position opening the outlet and a second position closing the outlet. At an intermediate position, between the first and second positions, the valve element is poised to be responsive to fluid flow through the housing whereby the valve element is caused to move to the second position in response to pressure of fluid flowing through the housing. The valve mechanism also includes a first biasing means that urges the valve element toward its normal first position, a second biasing means adapted to urge the valve element from the first position to the intermediate position, and releasable holding means that normally acts to prevent the second biasing means from moving the valve element to the intermediate position until the latching means is actuated to release the second biasing means. The releasable latching means is preferably a bimetallic electric resistance element that responds thermally and deflectively contracts to thereby release the second biasing means.
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