Valve actuators and combined valves and actuators

Details Valve actuators and combined valves and actuators Valve actuators and combined valves and actuators

1979-08-17

1981-04-07

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

With mechanical movement between actuator and valve

74 8912, 92133, 92136, 92 69R, 92138, 251 31, 251229, 251250, 251288, F16K 3122

Patent

active

042601282

ABSTRACT:
A valve actuator has at least one piston in a cylindrical chamber that has a segmental skirt provided with transverse teeth on its chordal face meshing with lengthwise teeth on the hub of a rotor extending diametrically through the chamber with one rotor end exposed and provided with a portion for mating engagement with a valve stem portion when the valve is clamped to the actuator. Air is delivered into the chamber on opposite sides of the piston and the skirt is provided with anti-friction elements. Single and dual piston embodiments are disclosed as well as the use of springs by which the valve is operated in a wanted manner in the event of loss of piston operating pressures.

REFERENCES:
patent: 2588955 (1952-03-01), Brannen
patent: 3104862 (1963-09-01), Pearson et al.
patent: 3107080 (1963-10-01), Priese
patent: 3246581 (1966-04-01), Carr
patent: 3650506 (1972-03-01), Bruton
patent: 3970285 (1976-07-01), Lonn
patent: 3982725 (1976-09-01), Clark
patent: 4046350 (1977-09-01), Massey et al.
patent: 4087074 (1978-05-01), Massey et al.

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