Dual flapper safety valve

Details Dual flapper safety valve Dual flapper safety valve

2010-08-17

2011-11-01

Gay, Jennifer H (Department: 3676)

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

C166S386000, C166S313000, C166S242300

Reexamination Certificate

active

08047294

ABSTRACT:
A valve system for use in a subterranean well, the valve having multiple closure devices, or a closure device and a device for protecting the closure device. A valve system includes a valve with a closure assembly. The closure assembly has a closure device and a protective device which alters fluid flow through a flow passage of the valve prior to closure of the closure device to thereby protect the closure device. A safety valve system includes a safety valve with a closure assembly having at least two closure devices arranged in series for controlling flow through a flow passage of the safety valve. Another safety valve system includes a safety valve assembly including multiple safety valves arranged in parallel. One portion of fluid from a fluid source flows through one of the safety valves, while another portion of fluid from the fluid source flows through another safety valve.

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