▁incorpor ating ▁water - f ed ▁hyd ra ul ic ▁bear ings . ▁ ▁Operation ▁ ▁Fl uid ▁bear ings ▁are ▁non contact ▁bear ings ▁that ▁use ▁a ▁thin ▁layer ▁of ▁rapidly ▁moving ▁press ur ized ▁liquid ▁or ▁gas ▁fluid ▁between ▁the ▁moving ▁bearing ▁faces , ▁typically ▁se aled ▁around ▁or ▁under ▁the ▁rot ating ▁sh aft . ▁ ▁The ▁moving ▁parts ▁do ▁not ▁come ▁into ▁contact , ▁so ▁there ▁is ▁no ▁sl iding ▁fr iction ; ▁the ▁load ▁force ▁is ▁supported ▁sole ly ▁by ▁the ▁pressure ▁of ▁the ▁moving ▁fluid . ▁There ▁are ▁two ▁principal ▁ways ▁of ▁getting ▁the ▁fluid ▁into ▁the ▁bearing : ▁ ▁In ▁fluid ▁static , ▁hydro static ▁and ▁many ▁gas ▁or ▁air ▁bear ings , ▁the ▁fluid ▁is ▁p ump ed ▁in ▁through ▁an ▁or ifice ▁or ▁through ▁a ▁por ous ▁material . ▁Such ▁bear ings ▁should ▁be ▁equ ipped ▁with ▁the ▁sh aft ▁position ▁control ▁system , ▁which ▁adjust s ▁the ▁fluid ▁pressure ▁and ▁consumption ▁according ▁to ▁the ▁rotation ▁speed ▁and ▁sh aft ▁load . ▁▁▁▁▁▁ ▁In ▁fluid - dynamic ▁bear ings , ▁the ▁bearing ▁rotation ▁su cks ▁the ▁fluid ▁on ▁to ▁the ▁inner ▁surface ▁of ▁the ▁bearing , ▁forming ▁a ▁lub ric ating ▁w edge ▁under ▁or ▁around ▁the ▁sh aft . ▁ ▁H ydro static ▁bear ings ▁rely ▁on ▁an ▁external ▁p ump . ▁ ▁The ▁power ▁required ▁by ▁that ▁p ump ▁cont ributes ▁to ▁system ▁energy ▁loss , ▁just ▁as ▁bearing ▁fr iction ▁otherwise ▁would . ▁ ▁Better ▁se als ▁can ▁reduce ▁leak ▁rates