| 摘要 |
A pressure responsive actuator having application to a valve spool or similar reciprocable member. The actuator includes a housing having a first chamber therein. A reciprocable member is positioned within the chamber and is shiftable from one end to the other end of the chamber. A fluid inlet is provided in the housing and has one inlet port in communication with one end of the chamber and another inlet port in communication with the other end of the chamber. A valve, which is normally closed, communicates with one end of the chamber for venting that end of the chamber when the valve is actuated. The housing defines a second chamber which is in communication with the first chamber at the opposite end of the chamber from the valve. The reciprocable member is shifted from one end to the other end of the chamber as pressurized fluid is introduced into the fluid inlet and passes simultaneously through the inlet ports into both ends of the first chamber and into the second chamber and as the valve is then actuated to vent one end of the first chamber.
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