Compact valve actuator

Details Compact valve actuator Compact valve actuator

F - Mech Eng,Light,Heat,Weapons

15

B

342/24, 138/83

F15B 15/14 (2006.01) F01L 9/02 (2006.01) F01L 9/04 (2006.01)

Patent

CA 2007102

PHA.40-559 08-08-1989 ABSTRACT: COMPACT VALVE ACTUATOR A pneumatically powered valve actuator is disclosed including a valve actuator housing, a main piston reciprocable within the housing along an axis and a pair of auxiliary pistons fixed to and movable with the main piston. The main piston has a pair of oppositely facing primary working surfaces. A pair of air control valves reciprocable along said axis relative to both the housing and the main piston between open and closed positions control air flow from a pressurized source causing the main piston and the pair of auxiliary pistons to move. Each auxiliary piston forms, in conjunction with a surface of the corresponding air control valve, a variable volume annular chamber. The variable volume chamber function during the early portion of piston movement to apply a reclosing force to the air control valve and during a latter portion of the piston movement to vent air compressed by the piston during damping. This venting of the residual air is in an axial rather than a radial direction.

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