Pilot operated safety valve

Details Pilot operated safety valve Pilot operated safety valve

1989-04-28

1990-03-27

Cohan, Alan

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

137487, E21B 3300

Patent

active

049111990

ABSTRACT:
A safety valve of the type having a valve body which is closed in response to an excess flow of fluid comprises a pilot piston which causes a sudden increase of the pressure in a cavity around the lower end of the valve stem if the pressure difference across the valve reaches a preset value, thereby controlling the valve such that is closes at a well defined setting point.

REFERENCES:
patent: 2160766 (1939-05-01), Thomason
patent: 2590918 (1952-04-01), Barnes
patent: 3400734 (1968-09-01), Rosenberg
patent: 4708163 (1987-11-01), Deaton

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