Subsea master valve apparatus

Details Subsea master valve apparatus Subsea master valve apparatus

1976-03-22

1977-03-01

Leppink, James A.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

166319, 166298, 251 58, E21B 2900

Patent

active

040097536

ABSTRACT:
A control valve apparatus adapted to be positioned within a subsea blowout preventer stack for controlling the flow of fluid from an offshore well includes a ball valve element provided with the capability of cutting coil tubing typically employed in well workover and completion operations. The ball element has a cutting edge that coacts with the valve seat to shear the tubing, and a relief slot that receives the tubing during cutting to prevent the tubing from being placed in double shear. Hydraulically operable means is provided to assist in closure of the ball valve element and consequent cutting of tubing extending into the well, in case of emergency.

REFERENCES:
patent: 2969838 (1961-01-01), Wilde
patent: 3233860 (1966-02-01), Dollison et al.
patent: 3561526 (1971-02-01), Williams, Jr. et al.
patent: 3766978 (1973-10-01), Orund et al.
patent: 3786865 (1974-01-01), Tausch et al.
patent: 3946806 (1976-03-01), Meynier

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