Hydraulic Symbols |
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LINES |
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Line, Working ( Main ) |
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Line, Pilot (For Control) |
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Line, Enclosure Outline |
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| Direction of Flow Hydraulic |
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Direction of Flow Pneumatic |
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| Lines Crossing |   |
Lines Joining |
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| Line with Fixed Restriction |
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Line, Flexible |
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Station, Testing, Measurement or Power Take-Off |
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Variable Component (Run Arrow Through Symbol at 45°) |
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| Pressure Compensated Units (Arrow Parallel to Short Side of Symbol) |
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Temperature Cause or Effect |
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Reservoir |
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Reservoir |
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Line, to Reservoir |
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Line, to Reservoir Below Fluid Level |
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| Vented Manifold |  |
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PUMPS (Hydraulic) |
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| Fixed Displacement |  |
Variable Displacement |  |
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MOTORS AND CYLINDERS |
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Hydraulic Motor Fixed Displacement |
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Hydraulic Motor Variable Displacement |
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| *Cylinder, single acting |  |
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| *Cylinder, Double Acting Single End Rod |
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*Cylinder, Double Acting Double End Rod |
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| *Cylinder, Double Acting Adjustable Cushion Advance Only |
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*Cylinder, Double Acting Differential Piston |
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* Cylinder symbol shown in simplified version
MISCELLANEOUS UNITS |
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| Electric Motor |  |
Accumulator, Spring Loaded |  |
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| Accumulator, Gas Charged |  |
Heater |  |
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| Cooler |  |
Temperature Controller |  |
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| Filter, Strainer |
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Pilot Pressure Remote Supply |
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Pressure Switch |
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Pilot Pressure Internal Supply |
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Pressure Indicator |
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Temperature Indicator |
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Component Enclosure |
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Direction of Shaft Rotation (Assume Arrow on Near Side of Shaft) |
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VALVES |
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| Check |  |
On-Off (Manual Shut-Off) |
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METHODS OF OPERATION |
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Spring |
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Pressure Relief |  |
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Manual |
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Flow Control, Adjustable-Non Compensated |  |
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Push Button |
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Flow Control, Adjustable (Temperature and Pressure Compensated) |  |
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Push-Pull Lever |
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Pedal or Treadle |
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Two Position Two Way |
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| Mechanical |
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Two Position |
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Detent |
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Two Position Four Way |
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Pressure Compensated |
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Three Position Four Way |
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Solenoid, Single Winding |
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Two Position In Transition |
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Servo Motor |
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Valves Capable of Infinite Positioning (Horizontal Bars Indicate Infinite Positioning Ability) |  |
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