Select or enter a symbol name to view the graphic and description.
| No | Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Mechanical components, such as shafts, pistons or levers |
| 2 |  |
Set of hydraulic components integrated into a single device |
| 3 |  |
Control signal line (internal or external) or drainage of excess fluid (e.g., leaks, venting) |
| 4 |  |
Line transporting hydraulic fluid (working, control, return) |
| 5 |  |
Direction of hydraulic fluid flow |
| 6 |  |
Linear motion, direction of fluid flow in valves |
| 7 |  |
Rotational motion in a specific direction |
| 8 |  |
Variability or adjustability (pumps, springs, electromagnets, etc.) |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Hydraulic pump with constant output and single flow direction |
| 2 |  |
Hydraulic pump with dual flow direction |
| 3 |  |
Hydraulic pump with variable output and single flow direction |
| 4 |  |
Hydraulic motor with constant absorption and single flow direction |
| 5 |  |
Hydraulic motor with constant absorption and dual flow directions |
| 6 |  |
Hydraulic motor with variable flow direction, constant working volume and dual rotation directions |
| 7 |  |
Hydraulic motor with single flow direction, variable working volume, unspecified control mechanism, internal leak drainage, single rotation direction, with double-ended shaft |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Hydraulic accumulator without indication of load type (vertical position only) |
| 2 |  |
Gas hydraulic accumulator, fluid maintained under pressure by compressed gas |
| No | Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Hydraulic actuator (cylinder) single-acting, pushing with spring |
| 2 |  |
Hydraulic actuator (cylinder) double-acting |
| 3 |  |
Telescopic hydraulic actuator (cylinder) double-acting |
| 4 |  |
Hydraulic actuator (cylinder) double-acting, adjustable with single-sided braking |
| 5 |  |
Hydraulic actuator (cylinder) single-acting plunger |
| 6 |  |
Hydraulic actuator (cylinder) with single-sided piston rod single-acting |
| 7 |  |
Hydraulic actuator (cylinder) with double-sided piston rod double-acting |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Non-loaded check valve, open when input pressure exceeds output pressure |
| 2 |  |
Spring-loaded check valve, open when input pressure exceeds the sum of output pressure and spring force pressure |
| 3 |  |
Controlled check valve, permissible flow directions: A1 - A2 (free flow), A2 - A1 (with control signal X) |
| 4 |  |
Hydraulic lock (double controlled check valve), permissible flow directions: A1 - A2 and simultaneously B2 - B1, B1 - B2 and simultaneously A2 - A1 |
| 5 |  |
Shut-off valve |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Non-adjustable throttle valve - flow resistance independent of working fluid viscosity |
| 2 |  |
Non-adjustable throttle valve - flow resistance dependent on working fluid viscosity |
| 3 |  |
Adjustable throttle valve - flow resistance dependent on working fluid viscosity |
| 4 |  |
One-way throttle-check valve, with adjustable throttling |
| 5 |  |
Flow divider |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Open-to-atmosphere tank, with return line below fluid level, with air filter |
| 2 |  |
Non-adjustable throttle valve - flow resistance dependent on working fluid viscosity |
| 3 |  |
Closed tank under normal pressure or closed with lines below fluid level, without atmospheric connection |
| 4 |  |
Filter |
| 5 |  |
Cooler |
| 6 |  |
Cooler with cooling medium flow lines |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Pressure indicator |
| 2 |  |
Pressure gauge |
| 3 |  |
Differential pressure gauge |
| 4 |  |
Thermometer |
| 5 |  |
Liquid level indicator |
| 6 |  |
Flow indicator |
| 7 |  |
Flow meter |
| 8 |  |
Tachometer symbol for measuring rotation frequency |
| 9 |  |
Torque meter |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
General symbol without indicating control method |
| 2 |  |
Push button |
| 3 |  |
Pull button |
| 4 |  |
Manual lever |
| 5 |  |
Spring |
| 6 |  |
Electromagnet with one coil |
| 7 |  |
Electromagnet with two coils, acting in opposite directions |
| 8 |  |
Hydraulic control by pressure: general, by pressure increase, by pressure decrease |
| 9 |  |
Hydraulic control with assistance by pressure increase, Hydraulic control with assistance by pressure decrease |
| 10 |  |
Two-stage control using hydraulic pressure |
| 11 |  |
Two-stage hydraulic control, external control supply |
| 12 |  |
Two-stage hydraulic control, internal control supply |
| 13 |  |
Two-stage hydraulic control, main valve set in middle position by springs, external control supply |
| 14 |  |
Two-stage hydraulic control, main valve set in middle position by pressure, external control supply, external drainage of control fluid and leaks |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Two-position valve |
| 2 |  |
Three-position valve |
| 3 |  |
Open channel, two paths connected, flow direction indicated by arrow |
| 4 |  |
Closed channel, two paths blocked |
| 5 |  |
Three-way spool channel |
| 6 |  |
Four-way spool channel |
| No | Graphic Symbol | Symbol Description |
|---|---|---|
| 1 |  |
Flow direction control valve 4/2, four flow paths, two independent positions, manually controlled, spring return |
| 2 |  |
Flow direction control valve 4/3, four flow paths, three independent positions, manually controlled, set in middle position by springs |
