Wireline safety check valve

Details Wireline safety check valve Wireline safety check valve

1980-04-28

1981-05-12

Novosad, Stephen J.

Wells

Above ground apparatus

With valve on cap or head

166329, 1375195, E21B 3404, E21B 4300

Patent

active

042666058

ABSTRACT:
A check valve for wireline operations is employed in oil well drilling where a high pressure is encountered in a well. The check valve permits a wireline to extend through the check valve and a ball chamber therein. The ball chamber has a check ball therein that rests between the wireline and a non restrictive flow passage open to the well, so that upon loss of the wireline the fluid or gas tending to escape forces the ball to block the wireline opening.

REFERENCES:
patent: 2376605 (1945-05-01), Lawrence
patent: 3424247 (1969-01-01), Lee
patent: 3532163 (1970-10-01), Ecuer

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