| 摘要 |
A downhole pump comprises a pump cylinder driven by a pneumatic cylinder. A compressor compresses air and delivers compressed air to the pneumatic cylinder under the control of first and second trip valves and a pilot valve. The trip valves control the pilot valve so that it alternately delivers the compressed air above and below the pneumatic cylinder piston to reciprocally drive the piston. The pneumatic cylinder piston connects to the pump cylinder via a pair of push rods to drive the pump cylinder piston to pump water from the well to an above-ground reservoir. |
