The invention relates to a feed pump for delivering fluid media, wherein the pump bearings are lubricated by the feed medium itself. Connecting channels with valve devices are provided on the suction side and on the pressure side upstream and downstream, respectively, of a displacement element and link the bearing area of the pump with the production channel. Said connecting channels are configured as straight bores in the pump housing. The valve devices are configured as tappets that are disposed in the associated connecting channel sections so as to be displaced while being tight with respect to suction.
1. Feed pump for delivering fluid media, wherein pump bearings are lubricated by feed media, the feed pump comprising:
connecting channels with valve devices provided on a suction side as well as on a pressure side of a displacement element,
wherein the connecting channels connect a bearing region of the pump with a production channel, and
wherein the connecting channels are configured in a pump housing as straight-line bores and the valve devices are configured as tappets that are displaceable and are arranged in a suction-tight manner with respect to the associated connecting channels.
2. Feed pump as claimed in claim 1 , wherein the length of the tappets corresponds to the length of the connecting channels.
3. Feed pump as claimed in claim 1 , wherein the tappets are controllable subject to a pressure prevailing in the production channel before and after the displacement element.