Pneumatically powered valve actuator

Details Pneumatically powered valve actuator Pneumatically powered valve actuator

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F01L 9/02 (2006.01) F01L 9/04 (2006.01)

Patent

CA 1314773

PHA 40538 30.11.1988 ABSTRACT PNEUMATICALLY POWERED VALVE ACTUATOR A bistable electronically controlled pneumatical- ly powered transducer for use, for example, as a valve mechanism actuator in an internal combustion engine is dis- closed. The transducer has an armature including a piston which is coupled to an engine valve, for example. The piston is powered by a pneumatic source and includes pneumatic and hydraulic damping as it nears its destination position. The armature is held in each of its extreme positions by pneumatic pressure under the control of control valves which are in turn held in their closed positions by per- manent magnet latching arrangements and are released there- from to supply air to the piston to be pneumatically driven to the other extreme position by an electromagnetic arrange- ment which temporarily neutralizes the permanent magnetic field of the latching arrangement.

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