Displacement pump with suction groove

摘要

A displacement pump, including a pump chamber and a regulating chamber which are separated from each other by a piston, wherein the pump has a device with which fluid flowing from the pump chamber toward the regulating chamber can be drained.

主权项

1. A displacement pump, comprising a pump chamber and a regulating chamber which are separated from each other by a piston, wherein the piston comprises a channel and a fluid guiding section, wherein the channel is disposed in a region in which the piston forms a sealing gap with a piston guide which surrounds the piston, wherein the channel is open toward the sealing gap and the fluid guiding section leads into the channel and to a suction side, wherein the suction side is connected to the channel fluidically via the fluid guiding section such that a pressure which is present on the suction side of the pump is also present in the channel such that fluid flowing from the pump chamber via the sealing gap toward the regulating chamber is drained to the suction side.