| 摘要 |
A pressure fluid operated control system incorporates an actuator member movable in a first direction along a path from which, at predetermined positions on the path, the actuator is movable into and out of operative positions in a second, transverse, direction. The invention provides first and second fluid actuator means for displacing the member in the two directions and incorporates, in controlling valve means for the actuator means, two interlock valves each of which is responsive to the operation of one of the fluid actuators and is connected in the supply to the other whereby each fluid actuator can only be operated if the other is correctly positioned. |
