| 摘要 |
The present invention relates to a reciprocating piston pump comprising:
- at least one cylinder with an inlet for a pressure medium;
- a piston slidable in the cylinder between a first and a second position, and forming a pressure chamber in the cylinder;
- a first valve member which is received in the piston and which in an open position mutually connects the cylinder spaces on either side of the piston;
- a second valve member which is received in the piston and which in an open position connects a pressure medium passage formed in the piston to an outlet of the pump;
- a resilient member urging the piston in the first position;
- actuating means which are connected to the valve members and which are embodied such that in the first position the first valve member is closed and the second valve member is opened and in the second position the first valve member is opened and the second valve member is closed, wherein the piston is moved to the second position by the pressure medium.
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