دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a annex with two inverted valves and connected with the bottom of the tail pipe

n: the casing float with two inverted valves ,used to improve the security of cementing operation

n: a kind of inverted valve which can be pumped into drill pipe or can be joined on the top of the drill pipe when necessary

n: a kind of valve joined to the top of the drilling pipe ,and used when there is no inverted valve or the inverted valve is out of work in the pipe

n: also called one-way valve,the valve that permit the fluid flow one way and not reture.