Motors: expansible chamber type – With motive fluid valve – Electrically operated
Patent
1989-01-06
1990-04-10
Okonsky, David A.
Motors: expansible chamber type
With motive fluid valve
Electrically operated
91465, 92 85B, 251 635, 13762564, 123 9014, F01L 900, F15B 13044
Patent
active
049150154
ABSTRACT:
A pneumatically powered valve actuator is disclosed and includes a valve actuator housing, a working cylinder within the housing having a pair of opposed contoured end faces, and a 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.
REFERENCES:
patent: 4582082 (1986-04-01), Tosseghini
patent: 4741364 (1988-05-01), Stoss et al.
patent: 4742989 (1988-05-01), Akagi
patent: 4777915 (1988-10-01), Bonvallet
patent: 4809587 (1989-03-01), Kawahara et al.
ERickson Frederick L.
Richeson William E.
Briody Thomas A.
Lo Weilun
Magnavox Government and Industrial Electronics Company
Okonsky David A.
Rickert Roger M.
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