| 摘要 |
The specification describes a reciprocating piston pump for manual or power driven operation. It comprises a piston, a cylinder for the piston, a piston tube carrying the piston and valves adjacent to an outer end of the piston tube ad to the other end of the pump for regulating flow through the pump. The valves are provided with means for operating them by mechanical friction on relative movement taking place between the piston tube and the cylinder.
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