HYDRAULICSDOE-HDBK-1018/2-93Miscellaneous Mechanical ComponentsThe high pressure oil flows through a control valve (directional control). The control valveFigure 8 Basic Hydraulic Systemchanges the direction of oil flow, depending upon the desired direction of the load. In Figure8 the load can be moved to the left or to the right by changing the side of the piston to whichthe oil pressure is applied. The oil that enters the cylinder applies pressure over the area of thepiston, developing a force on the piston rod. The force on the piston rod enables the movementof a load or device. The oil from the other side of the piston returns to a reservoir or tank.HazardsThe hazards and precautions listed in the previous chapter on air compressors are applicable tohydraulic systems as well, because most of the hazards are associated with high pressureconditions. Any use of a pressurized medium can be dangerous. Hydraulic systems carry all thehazards of pressurized systems and special hazards that are related directly to the compositionof the fluid used.ME-05Rev. 0Page 12
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