Fail-safe fluid piloted valve positioner with hydromechanical po

Details Fail-safe fluid piloted valve positioner with hydromechanical po Fail-safe fluid piloted valve positioner with hydromechanical po

1984-11-01

1987-10-13

Garrett, Robert E.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

91 44, 92 24, 92 84, 92128, 92167, F16K 31163, F15B 1526, F16J 110

Patent

active

046993550

ABSTRACT:
A fail-safe system for use on a hydraulic piloted pressure reducing and regulating valve for holding the valve at the last selected operating pressure in the event of loss of control signals. A pressure regulating valve having a body and a control piston therein is provided with a pilot piston in the body which is adapted to be connected to and responsive to a hydraulic signal pilot pressure. A segmented locking ring surrounds the assembly and coacting concentric V-shaped locking grooves are provided between the locking ring and the assembly for locking the assembly. The segmented ring is biased towards an unlocked position. An annular cam ring engages the exterior of the locking ring. Coacting wedge surfaces between the cam ring and the locking ring are provided for locking and releasing the locking ring. The cam ring is biased for urging the coacting wedge surfaces into engagement. A release piston engages the cam ring for moving the cam ring in a direction to disengage the coacting wedge surfaces upon the application of release pressure.

REFERENCES:
patent: 2815736 (1957-12-01), Wright
patent: 3036596 (1962-05-01), Alfieri
patent: 3311030 (1967-03-01), Halstead
patent: 3353455 (1967-11-01), Berry
patent: 3941141 (1976-03-01), Robert
patent: 3995534 (1976-12-01), Rastetter
patent: 4069747 (1978-01-01), Forry et al.
patent: 4300664 (1981-11-01), Helm et al.
patent: 4305565 (1981-12-01), Abbe
patent: 4444216 (1984-04-01), Loup
patent: 4531548 (1985-07-01), Gottling et al.
patent: 4565349 (1986-01-01), Tomlin

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