ENGINEMAN 1 & Cof the pressure control. When a shuttle valve failsto operate, the stop valves should be closed andthe defective valve removed and repaired.Incorrectly adjusted needle valves can bebecause the valve adjustment may allow morefluid to pass through leakage points in the systemthan through the valve.another source of trouble. Needle valves whichare adjusted too fine may cause the deviceoperated by the valve to stop short of itsintended stopping point. This may happenSERVOVALVESAlthough there are many types of valvesused for control in a hydraulic system, the valveFigure 7-4.—Servovalve—neutral.7-20
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