This section presents a list of common hydraulic symbols, hydraulic
schematic diagrams which are useful for reading, understanding and
interpreting hydraulic schematics and circuit drawings. The following
page shows the Working Line-Pressure/Return Hydraulic symbols, Hydraulic
Cylinder Symbols, Hydraulic Motors Symbols etc. Check out
"Hydraulic Symbols" are used to read hydraulic schematics by
technicians and students. The varied hydraulic symbols for cylinders,
motors, lines, reservoirs, filters, directional valves, control valves,
control buttons etc. are illustrated in both line art/engineering
drawings and cut-away view drawings. These symbols are used to represent
hydraulic components, tools in hydraulic schematic circuits.
Technicians/students can easily identify these symbols which help in
simplifying the task of visualizing hydraulic circuits. Once visualized,
more detailed circuit drawings become easier to read and comprehend.
| Line |
Capacity |
 |
Working Line-Pressure/Return |
 |
Fixed Capacity with one Direction of Flow |
 |
Pilot Control Line- External/Internal Drain Line |
 |
Fixed Capacity with Two Directions of Flow |
 |
Enclosure of two or more functions contained in one
unit |
 |
Variable Capacity (with Undefined Control Mechanism
One Direction of Flow |
 |
Flexible Connection |
 |
Variable Capacity (with Undefined Control Mechanism
Two Directions of Flow |
 |
Pipe Line Junction |
 |
Variable Capacity-Pressure Compensate Pump with One
Direction of Flow |
 |
Crossing -Not Connected |
Motors |
 |
Hydraulic Source of Energy |
 |
Fixed Capacity Uni-Directional Output |
 |
Pneumatic Source of Energy |
 |
Fixed Capacity Bi-Directional Output |
| Direction |
|
|
 |
Directions of Flow |
 |
Variable Capacity (with Undefined Control Mechanism
Uni-Directional Output |
 |
Directions of Rotation |
 |
Variable Capacity (with Undefined Control Mechanism
Uni-Directional Output |
 |
Facility for Adjustment of: Spring Pump,
Solenoid,Cylinder, Damping etc. |
Cylinders |
 |
Spring |
 |
Single Acting Spring Return (Pneumatic) |
 |
Restriction to flow Line |
 |
Double Acting-Single Piston Rod (Hydraulic) |
 |
Power Line Plugged |
 |
Double Acting-Double Piston Rod |
| Connections |
|
|
 |
Quick Release-Self Sealing Coupling-Connected
(Mechanically opened) |
 |
Double Acting-Fixed Cushion at full area side only |
 |
Coupling-Blocked e.g. Gauge Point |
 |
Double Acting-Fixed Cushioning at both ends |
 |
Rotary Juction-One Connection |
 |
Double Acting-Adjustable Cushioning at both ends
(Pneumatic) |
 |
Rotary Juction-Thre Connections |
 |
Double Acting Telescopic Cylinder |
 |
Rotary Shaft-Uni-directional |
 |
Semi -Rotary Actuator Limited Angle |
 |
Rotary Shaft-Bi-directional |
|
|
 |
Shaft-Detent Held |
|
|
 |
Pivoting Device |
|
|
|
|
|
|