Manually reset control valve for a fluid actuator

Details Manually reset control valve for a fluid actuator Manually reset control valve for a fluid actuator

1979-03-15

1981-02-24

Weakley, Harold W.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

13762427, 13762566, 13762568, F16K 1700

Patent

active

042521459

ABSTRACT:
A manually reset control valve (28) to control the flow of fluid to a fluid actuator (22) in a safety system for closing a valve in a main flowline (10) upon the reaching of predetermined high and low pressures in the main flowline. The control valve includes an elongate housing having a supply port (26) and a bleed port (124) for the actuator, and a sensing port (34) for monitoring the fluid pressure in the main flowline. The valving in the bore of the housing includes a pressure sensing valve mechanism (42) and a control fluid valve mechanism (44). Pressure sensing valve mechanism (42) includes a high pressure spring (94) responsive to a predetermined high pressure in the flowline to actuate the valving and a low pressure spring (58) responsive to a predetermined low fluid pressure in the flowline to actuate the valving for bleeding the actuator. The control fluid valve mechanism (44) includes a piston (110) movable between supply and vent positions in response to the actuation of the sensing valve mechanism (42). A manual gripping knob (108) on an outer end of the control fluid valve mechanism (44) is pushed for resetting the valving after actuation and a lost motion connection between the pressure sensing valve mechanism (42) and the control fluid valve mechanism (44) permits valve mechanism (44) to be pushed in and reset with a minimum of force.

REFERENCES:
patent: 3874415 (1975-04-01), Pierce
patent: 3943974 (1976-03-01), Connelly
patent: 3977438 (1976-08-01), Muchow
patent: 4026326 (1977-05-01), Wells
patent: 4034613 (1978-04-01), Peters
patent: 4073466 (1978-02-01), Snyder
patent: 4137942 (1979-02-01), Hargraves

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