Low pressure shutoff valve for fluid operated tool

Details Low pressure shutoff valve for fluid operated tool Low pressure shutoff valve for fluid operated tool

1976-07-21

1978-05-23

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 44, 137466, F16K 31143

Patent

active

040906884

ABSTRACT:
A low pressure shutoff valve adapted to be interposed in the fluid supply conduit of a fluid operated torque tool comprises a piston closure member having opposed differential pressure faces exposed to fluid supply pressure and a coil spring for biasing the piston toward a fluid shutoff position. The piston is disposed in a chamber which may be vented by actuating an axially slidable sleeve on the exterior of the valve body whereby the valve is opened to supply pressure fluid to the tool as long as the fluid pressure is greater than a predetermined minimum value.

REFERENCES:
patent: 2537051 (1951-01-01), Grant, Jr.
patent: 2799466 (1957-07-01), Hickerson
patent: 2814307 (1957-11-01), Hafele et al.
patent: 2996074 (1961-08-01), Page et al.
patent: 3860073 (1975-01-01), Willms

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