Ball valve apparatus

Details Ball valve apparatus Ball valve apparatus

E - Fixed Constructions

21

B

166/41

E21B 34/04 (2006.01) F16K 5/06 (2006.01)

Patent

CA 1265438

ABSTRACT OF THE DISCLOSURE In accordance with illustrative embodiments of the present invention, a new and improved subsea test tree includes a hydraulically operable control unit and shut-in valve unit that are releasably latched together. The control unit includes an integral retainer valve system at the upper end thereof. The main shut-in valve, which is a ball valve, is a fail-close device under the influence of a spring and nitrogen pressure. Additional assistance in close the valve may be provided if needed by hydraulic pressure applied to a surface control line. Internal pressure may be vented prior to unlatching the control unit in case of an emergency.

583305

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