| 摘要 |
A self-recycling actuator operated by a source of fluid pressure is used to control the operation of a valve. The valve has a main valve member whose position is controlled by a pilot valve adapted to vent the high pressure side of the main valve member. The self-recycling actuator controls the pilot valve and is operated by the high pressure fluid from the inlet of the main valve. High pressure fluid brought to the inlet of the self-recycling actuator displaces a plunger member thereby opening the pilot valve and hence the main valve. At the same time, high pressure fluid enters a recycling chamber. As pressure builds up in the recycling chamber, the plunger is returned to its initial position. Vent means reduces the pressure in the recycling chamber thereby initiating a new cycle.
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