Wire cutting valve actuator

Details Wire cutting valve actuator Wire cutting valve actuator

1990-09-19

1993-01-12

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

92130A, 92130C, 92130D, 251 636, F16K 31122, F15B 1514, F15B 2000

Patent

active

051783606

ABSTRACT:
The invention is a valve actuator or a booster module for an existing valve actuator that provides an incremental force to the valve stem at a position close to valve closure. The force is stored in a spring which is held in the compressed position by a collet. Upon sufficient movement of the valve actuator stem in the direction towards valve closure, the collet which had previously held the spring in a compressed position is freed to move to allow the spring to expand against the collet. Since movement of the collet has caused it to be engaged to the valve actuator stem, the spring forces are transmitted directly to the valve actuator stem via the collet. The spring is oriented in a direction substantially parallel to the valve stem so that substantially all of its retained energy is transmitted directly to the valve stem through the collet.

REFERENCES:
patent: 3272087 (1966-09-01), Culver
patent: 3320861 (1967-05-01), Johnson
patent: 4372333 (1983-02-01), Goans
patent: 4519575 (1985-05-01), Akkerman
patent: 4523639 (1985-06-01), Howard, Jr.
patent: 4651970 (1987-03-01), Sadler
patent: 4871143 (1989-10-01), Baker
patent: 4925154 (1990-05-01), Baker
Otis Engineering Corporation brochure #OEC5315(03094) dated Apr. 1982 "Introducing the Otis Type WC Actuator".
AVA International Catalog No. PA8603 entitled "Gate Valve (SSV) Actuators".

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