Fluid Power Symbols Hydraulic Lines Working Hydraulic Line

Fluid Power Symbols

Hydraulic Lines Working Hydraulic Line Pilot Line Drain Line Flexible Lines Joining Lines Passing Flow Direction, Hydraulic Line To Tank (Above Fluid Level) Line To Tank (Below Fluid Level) 1

2 Plug or Plugged Connection Fixed Restriction (Fixed Orifice) Pumps Fixed Displacement, Unidirectional, Hydraulic Pump Fixed Displacement, Bi -Directional, Hydraulic Pump Variable Displacement, Non-Compensating, Unidirectional, Hydraulic Pump

Variable Displacement, Non-Compensating, Bi-Directional, Hydraulic Pump Variable Displacement, Pressure Compensated, Unidirectional, Hydraulic Pump Variable Displacement, Pressure Compensated, Bi -directional, Hydraulic Pump Motors and Cylinders Fixed Displacement, Unidirectional, Rotary Hydraulic Motor 3

4 Fixed Displacement, Bi -Directional, Rotary Hydraulic Motor Variable Displacement, Unidirectional, Rotary Hydraulic Motor Variable Displacement, Bi-Directional, Rotary Hydraulic Motor Limited Rotation Hydraulic Motor Single Acting Cylinder Double Acting Cylinder

5 Double End Rod Cylinder Basic Valves Check Valve, Pilot Operated To Close Check Valve, Pilot Operated To Open Manual Shut off Valve Single Flow Path Valve, Normally Not Passing Single Flow Path Valve, Normally Passing

Basic Valves II Pressure Relief Valve Two Position, Multiple Flow Path Valve(Arrows Indicate Flow Direction) Open Center, Three Position, Directional Control Valve Closed Center, Three Position, Directional Control Valve Tandem Center, Three Position, Directional Control Valve Float Center Three Position, Directional Control Valve 6

7 Unloading Valve, Internally Drained, Remotely Operated Adjustable Non. Compensated Flow Control Valve Deceleration Valve, Normally Passing Sequence Valve, Directly Operated, Externally Drained Pressure Reducing Valve

8 Pressure Reducing and Relieving Valve Counter Balance Valve with Check Valve Temperature and Pressure Compensated Flow Control Valve with Check Valve Pressure Compensator

Detent Manual Mechanical Pedal or Treadle Push Button Lever Pilot Pressure Solenoid Spring 9

Solenoid Controlled, Pilot Pressure Operated 10 Servo Miscellaneous Hydraulic Symbols Pressure Gage Temperature Gage Flow Meter Electric Motor Heat Engine (E. G. Internal Combustion Engine) Hydraulic Nozzle M

Accumulator, Loaded Spring Accumulator, Charged Accumulator, Loaded Gas Weight Filter or Strainer Separator with Manual Drain Separator with Automatic Drain Filter – Separator with Manual Drain Filter – Separator with Automatic Drain 11

Dessicator (Chemical Dryer) Heater Cooler Temperature Controller Intensifier Pressure Switch Lubricator Without a Drain Lubricator With a Drain Pneumatic Symbols Flow Direction Pneumatic 12

13 Unidirectional Pneumatic Motor Bi-Directional Pneumatic Motor Pneumatic Compressor, Fixed Displacement Pneumatic Nozzle Muffler Venturi