Actuated gate valve with manual override

Details Actuated gate valve with manual override Actuated gate valve with manual override

1989-08-22

1990-05-01

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

74 25, 74 57, 74 89, 74625, 192 71, 251229, 251252, 251 635, 251 636, 251 58, F16K 31143

Patent

active

049212079

ABSTRACT:
An improved gate valve having a body with a gate positioned therein to reciprocate between positions opening and closing flow through the body, a pressure responsive actuator connected to move the gate stem, a manual override stem and an overriding drive connection connecting both the actuator and the manual override stem to the gate stem so that the gate stem and gate are moved by both the actuator and by the manual override stem independently of the actuator. A modified form of the invention is provided for directly connecting to an extension of an actuator stem for operating a valve manually. In another modified form, camming element and a camming extension are provided to increase the forces providing release of the paddles from within a groove on the interior of the housing so that the locking action of the paddles do not prevent proper operation of the mechanism.

REFERENCES:
patent: 2705609 (1955-04-01), Prescott
patent: 2885172 (1959-05-01), Natho
patent: 3417960 (1968-12-01), Stehlin
patent: 3492880 (1970-02-01), Pearson
patent: 4189950 (1980-02-01), Killian
patent: 4194718 (1980-03-01), Baker et al.
patent: 4213480 (1980-07-01), Orum et al.
patent: 4616803 (1986-10-01), Schils
patent: 4650151 (1987-03-01), McIntyre
patent: 4791856 (1988-12-01), Heim et al.

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