| 摘要 |
The actuating mechanism of a normally closed solenoid valve has a push pin, or plunger, that is acted upon by the solenoid's armature to unseat a spring-biased spherical ball from a valve seat when the solenoid is operated from de-energized to energized. The pin is disposed in the flow path through the valve and executes reciprocating axial motion as the solenoid is energized and de-energized. The pin is guided by a portion of the wall describing the flow path. The pin has a slender cylindrical core that is surrounded by a plastic sleeve that has been over-molded onto the core. Because it is slender, the metal core does not interfere with the solenoid's magnetic circuit that operates the armature. The sleeve has a nominally circular O.D. that provides for the close guidance of the pin's axial reciprocation, and it contains slots that provides flow channels for the fluid passing along the pin when the valve is open.
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