Ball-and-seat valve:

It consists of a polished sphere, or ball, usually or metal, and an annular piece, the seat, ground and polished to form a seal with the surface of the ball.

Gravitational force or the force of a spring holds the ball against the seat.

Flow in the direction of the force is presented, while flow in in the opposite direction overcomes the force and unseats the ball.

Terms Related to Ball-and-seat valve

• Poppet valve

  A device that controls the rate of flow of fluid in a line or opens or shuts off the flow of fluid completely. When open, ...

• Ball valve

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

• Traveling valve

  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 ...

• Standing valve

  A fixed ball-and-seat valve at the lower end of the working barrel of a sucker rod pump. The standing valve and its cage do not ...

• Cage

  The part of a pump valve which holds the ball to limit its movement.

• Ball-out

  To plug open perforations by using ball sealers.

• Ball and seat

  The main parts of the valves in a plunger-type oil-well pump.