دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a flow-control device employing a ball with a rotating mechanism to open or close the tubing.

any of several valves that rotate a ball with a flow passage to allow or deny flow.

n: A kind of bailer in cable drilling. The ball valve connected with projecting board is installed in the bailer. Open the ball valve and bail when projecting board touchs the bottom or object on the surface.

n: a joint with ball valve and connected between the pipe and the kelly bar