Pump for conveying liquid media comprises a displacement body with sliding bearings positioned in a pump housing, and channels connecting the sliding bearings to product channel on the vacuum side to recycle the conveying medium

摘要

Pump for conveying liquid media comprises a displacement body (12) with sliding bearings (8, 9) positioned in a pump housing (1), and connecting channels (10, 11) connecting the sliding bearings to the product channel (7) on the vacuum side (S) to recycle the conveying medium lubricating the sliding bearings. The connecting channels are connected to outward-opening control channels (14, 15). Guide channels (16, 17) receiving valve lifters (18, 19) extend the connecting channels into the housing of the lid (2, 3). The valve lifters each have a constriction (20, 21). The parts of the valve lifters adjacent to the product channel have a length and diameter corresponding to the length and diameter of the connecting channel. Preferred Features: The constrictions have a length corresponding to the distance between the opening of the control channel in the lid housing and the opening of the connecting channel on the outer side of the pump housing.