| 摘要 |
An electrical solenoid valve has a coil and a movable armature. A first valve element is subject to pressure from an inlet and a second valve element is operated by the armature, when the coil is energized, to close a port in the valve element and so isolate the inlet from a pressure fluid outlet to a brake. The valve element is displaceable under the effect of a pressure differential across it as a result of closing the port, the force derived from the then predominant inlet pressure being transmitted by the second valve element to load a spring device connected to the armature. Such spring loading increases the force tending to release the armature and leads to rapid opening of the port (18), when required.
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