back-pressure valve [′bak ‚presh·ər ‚valv]
An automatic valve which permits liquid to flow in only one direction. Also see non-return valve.
(petroleum engineering)
A check valve installed in a natural-gas well bore to shut off gas flow while replacing the blowout preventer (used during drilling) with a christmas tree piping arrangement, which controls gas flow out of the completed well.
check valve, back-pressure valve, reflux valve
check valve
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