Fail-safe actuator device

Details Fail-safe actuator device Fail-safe actuator device

1983-08-24

1984-11-06

Chambers, A. Michael

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

92 94, 92 98D, 92 99, 92137, F16K 3100

Patent

active

044808119

ABSTRACT:
The present invention relates to a fail-safe actuator of the type in which a piston riding in a cylinder is urged toward a port end of the cylinder by an energy storage spring. The piston is prevented from moving toward the port end so long as liquid remains entraped between the piston and port end, movement of the piston toward the port end resulting in shifting of a cable and consequent rotation of a quadrant about which the cable is arrayed to rotate a shaft. A rolling seal diaphragm is interposed between the piston and cylinder whereby leakage is prevented over protracted use periods, and the piston is isolated from liquid between the port and piston. Optionally, an annulus disposed between the piston and cylinder bears against the roll seal portion of the diaphragm preventing extrusion or permanent distortion of the diaphragm under high pressure conditions.

REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 3144812 (1964-08-01), Roger et al.
patent: 3293992 (1966-12-01), Baumann
patent: 3386345 (1968-06-01), Taplin
patent: 3801062 (1974-04-01), Arn et al.
patent: 4003547 (1977-01-01), Snyder et al.
patent: 4397219 (1983-08-01), Belart

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