Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Patent
1988-01-12
1989-01-24
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
74 32, 74 33, 74 8912, 744248VA, 251 58, 251229, 251250, 251267, F16K 31143, F16K 3154
Patent
active
047996447
ABSTRACT:
The invention concerns an actuator for the operation of on-off valves. Said actuator includes a supporting body (1) in which there is transversally disposed at least one pneumatic cylinder (8, 9) which is capable of activating in two directions, a rack (7) which in turn is engaged with a cogged wheel (31; 50; 100) co-axial with the central shaft (15, 66, 104) of said actuator and able to transmit its own rotation through a pair of free wheels (27, 28; 61, 62; 109, 110) which rigidly and alternatively engage themselves in discordant directions with a ring (33, 34; 62, 63; 108) integral with the central shaft of the actuator, and pneumatic pistons for achieving the relative axial movement between the cogged wheel and the shaft of the actuator. Depending on the mutual distance between the free wheels, and in the absence of the pneumatic signal, the actuator has its central shaft blocked or manually maneuvereable. Moreover, besides the direct rotation of the throttle valve being integral with the shaft of the actuator, the operation of the guillotine-type valves is achieved by providing the shaft of the actuator with a screw chamber and a screw (69) integrated with said chamber for controlling the guillotine-type opening and closing of the valve.
REFERENCES:
patent: 2608374 (1952-08-01), Morehead
patent: 2954703 (1960-10-01), Morrell
patent: 2974921 (1961-03-01), Kaswan
patent: 3007487 (1961-11-01), Adams
patent: 3195418 (1965-07-01), Zukas
patent: 4493336 (1985-01-01), Renfro
G.T.I. du Gaianigo Umberto & Co. Snc
Walton George L.
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