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Fluid Power Symbols
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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)
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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
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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
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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
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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
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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
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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
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8 Pressure Reducing and Relieving Valve Counter Balance Valve with Check Valve Temperature and Pressure Compensated Flow Control Valve with Check Valve Pressure Compensator
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9 Detent Manual Mechanical Pedal or Treadle Push Button Lever Pilot Pressure Solenoid Spring
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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
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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
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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
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13 Unidirectional Pneumatic Motor Bi-Directional Pneumatic Motor Pneumatic Compressor, Fixed Displacement Pneumatic Nozzle Muffler Venturi
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