| 摘要 |
Pump for liquids and gases, particularly for immersing in a well hole. A pump piston (35) is operated by a double acting operating piston (33) provided with working medium through a supply conduit (13). The supply of working medium to the respective sides of the operating piston (33) is controlled by a reversing valve (34). This has a slide (45) being operated by the operating piston (33).
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