1. Fluid Power Symbols

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

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

4. 3
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

5. 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

6. Basic Valves 5 Double End Rod Cylinder Check Valve
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

7. Basic Valves II 6 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

8. 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

9. 8
Pressure Reducing and Relieving Valve
Counter Balance Valve with Check Valve
Temperature and Pressure Compensated Flow Control Valve with Check Valve
Pressure Compensator

10. 9
Detent
Manual
Mechanical
Pedal or Treadle
Push Button
Lever
Pilot Pressure
Solenoid
Spring

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

12. 11
Accumulator, Spring Loaded
Accumulator, Gas Charged
Accumulator, Weight Loaded
Filter or Strainer
Separator with Manual Drain
Separator with Automatic Drain
Filter – Separator with Manual Drain
Filter – Separator with Automatic Drain

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

14. 13
Unidirectional Pneumatic Motor
Bi-Directional Pneumatic Motor
Pneumatic Compressor, Fixed Displacement
Pneumatic Nozzle
Muffler
Venturi