F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
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 2007297
PHA.40-557 08-08-1989 ABSTRACT: PNEUMATIC ACTUATOR A pneumatic powered valve actuator is disclosed and includesa valve actuator housing, a working cylinder within the housing having a pair of opposed contoured end faces, and main piston reciprocable within the cylinder along an axis. The main piston has a pair of oppositely facing primary working surfaces contoured substantially the same as the opposed end faces of the working cylinder to mate therewith providing a small minimum volume and, therefor, a high compression ratio. A pair of air control valves are reciprocable along the axis relative to both the housing and the main piston between open and closed positions for selectively supplying high pressure air to the piston primary working surfaces. The contoured end faces each include a central opening, an outer annular flat surface, and an intermediate frustoconical surface connecting the central opening and the flat surface. A piston motion damping arrangement is operable subsequent to initial piston movement and responsive to continued piston motion for compressing a trapped volume of air thereby slowing piston movement and an array of reed valves return some of the trapped air which has been compressed to a pressure greater than the pressure of the high pressure source to the high pressure source. The reed valves are adjustable to selectively control the quantity of trapped air which is returned to the high pressure source. There are auxiliary pistons defining variable volume chambers for supplying an air control valve reclosing pressure and there is a resilient bumper on each auxiliary piston for engaging and closing the corresponding air control valve if the pressure in the variable chamber is inadequate to close the air control valve.
Erickson Frederick L.
Richeson William E. Jr.
Erickson Frederick L.
Fetherstonhaugh & Co.
Magnavox Electronic Systems Company
Magnavox Government And Industrial Electronics Company
Richeson William E. Jr.
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