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