| 摘要 |
<p>An electrically operated valve has a coil (3) and a movable armature (22). A pressure responsive device (17) is subject to pressure from an inlet (5) and a valve element (9) is operated by the armature (22), when the coil (3) is energised, to close a port (18) in the device (17) and so isolate the inlet (5) from a pressure fluid outlet (19) to a working system, such as a vehicle anti-skid braking system. The device (17) 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 valve element (9) to load a spring device (27) 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.</p> |
