| 摘要 |
A valve for use in a downhole drilling fluid pumping system comprises a valve body, a valve seat 160 disposed within said valve body, a valve member 114 adapted to sealingly engage said valve seat 160, and an actuator 130 operatively coupled to said valve member 114 via a non-rigid connector 143, said actuator 130 being adapted for selectively moving said valve member 114 relative to said valve seat 160. |
