| 摘要 |
A water drain valve for use in cooperation with a fuel filter having a water separation capability includes a valve housing, a flow-control piston disposed within the valve housing, a first sealing grommet defining a water flow path into the valve housing, a second sealing grommet defining an air flow path out of said valve housing and a spring-biased control lever assembled to the valve housing and cooperating with the flow-control piston so as to rotate the piston from a drain valve normally-closed condition to a drain valve normally-pen condition. The valve housing is a unitary casting having a sidewall defining first and second flow apertures, one of which receives the first sealing grommet and the other of which receives the second sealing grommet. The flow-control piston includes a first part-spherical portion which includes a water drain passageway therethrough leading to a drain opening which is defined by the valve housing. The flow-control piston also includes a second part-spherical portion defining an air flow passageway therethrough leading from the drain opening. In the normally-closed condition, the flow-control piston is turned such that the first part-spherical portion closes the flow communication between the water drain passageway and the water flow path. Concurrently, the second part-spherical portion closes the flow communication between the air flow passageway and the air flow path. In the opened condition, there is flow communication between the water drain passageway and the water flow path and between the air flow passageway and the air flow path for draining water from the fuel filter and providing vent air into the fuel filter.
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