The single line central lubrication system BEKAWIND Single was developed especially for operation in wind converters. It can be used for the lubrication of all kinds of bearings including main bearings, blade bearings and yaw bearings. System Design The drawing to the right shows the design and the operating principle of a BEKAWIND Single central lubrication system for 3 blade bearings with each 6 lube points. The system consists of an electrical piston pump EP-1RS, 3 UE distributors with each 6 outlets, a pressure switch with manometer and the necessary tubes and fittings. The automatic lubrication system is controlled and monitored by the central controller of the wind converter. The lubricant is supplied as long into the main line, as the switching pressure of the pressure switch, which is situated at the end of the longest feed line, is reached. To achieve the switching-over of the distributor, the pump and the 22 way solenoid valve are switched off to release the pressure line. The remaining lubricant is delivered back to the reservoir. The automatic lubricating system is protected by a pressure relief valve with return flow to the reservoir. The reservoir is equipped with a level switch.