product description:

   The sucker rod anti-drop device is manufactured by a special process. It is installed on the polished rod end and the screw pump end respectively, and is used in series with the sucker rod string. The screw pump can transmit torque when it rotates in the forward direction. When it stops, it can quickly release the energy stored in the rotation of the rod to prevent tripping caused by the reversal of the rod and avoid the risk of injury caused by the polished rod detaching from the rod. The modified products have been widely used in Liaohe Oilfield, Daqing Oilfield, Offshore Oilfield, Shengli Oilfield.