دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: one of the two valves in a sucker rod pumping system. It moves with the movement of the sucker rod string. On the upstroke, the ball member of the valve is seated, supporting the fluid load. On the downstroke, the ball is unseated, allowing fluid to enter into the production column. Compare standing valve.

the valve at the top of the pump in a beam pump.