Pneumatic Component Symbols
This article provides a comprehensive guide to the essential symbols used in pneumatic systems, focusing on directional flow control valves, valve actuators, pneumatic cylinders, vacuum components, and air filtration and regulation devices. These symbols are crucial for accurately designing and interpreting pneumatic schematics.
Directional flow control valves
Table 1: Pneumatic valve types and symbols
| Component description | Symbol |
| 2/2-way valve, closed normal position |
|
| 2/2-way valve, open normal position |  |
| 3/2-way valve, closed normal position |  |
| 3/2-way valve, open normal position |  |
| 3/3-way valve, closed neutral position |  |
| 4/2-way valve |  |
| 4/2-way valve, closed neutral position |  |
| 4/2-way valve, exhaust neutral position |  |
| 5/2-way valve |  |
| 5/3-way valve, closed neutral position |  |
| 5/3-way valve, exhaust neutral position |  |
| 5/3-way valve, open neutral position |  |
| Check valve |
|
| Pilot-operated check valve |  |
| Adjustable flow control valve |  |
| Solenoid direct |  |
Read our solenoid valve symbols article for more details on the functions, symbols, and application examples of solenoid valves in fluid power diagrams and piping and instrumentation diagrams (P&ID).
Pneumatic valve operator symbols
Table 2: Pneumatic valve actuator types and symbols
| Description | Symbol |
| General manual |  |
| Push button |  |
| Pull button |  |
| Push/pull button |  |
| Lever |  |
| Pedal |  |
| Plunger |  |
| Spring |  |
| Roller |  |
| Unidirectional |  |
| Pressure |  |
| Differential pressure |  |
Pneumatic cylinder types
Table 3: Pneumatic cylinder types and symbols
| Component description | Symbol |
| Single-acting cylinder, front spring |  |
| Single-acting cylinder, rear spring |  |
| Single-acting cylinder, front spring with position sensing |  |
| Single-acting cylinder, rear spring with position sensing |  |
| Single-acting cylinder, front spring, through rod with position sensing |  |
| Double-acting cylinder, fixed mechanical cushioning |  |
| Double-acting cylinder, fixed mechanical cushioning with position sensing |  |
| Double-acting cylinder, adjustable cushioning |  |
| Double-acting cylinder, adjustable cushioning with position sensing |  |
| Double-acting cylinder, self adjusting cushioning with position sensing |  |
| Double-acting cylinder, through rod, fixed mechanical cushioning |  |
| Double-acting cylinder, through rod, fixed mechanical cushioning with position sensing |  |
| Double-acting cylinder, through rod, fixed mechanical cushioning, hollow piston rod |  |
| Double-acting cylinder adjustable cushioning with position sensing |  |
| Rodless cylinder, double-acting, fixed cushioning with position sensing |  |
| Rodless cylinder, double-acting, adjustable cushioning with position sensing |  |
| Rodless cylinder, double-acting, self adjusting cushioning with position sensing |  |
| Single-acting rotary cylinder |  |
| Double-acting rotary cylinder |  |
| Bellows cylinder |  |
| Clamping cylinder |  |
| Rotary indexing table |  |
| Double-acting parallel gripper |  |
| Double-acting angular grippers |  |
| Single-acting parallel gripper (NC) |  |
| Single-acting angular gripper (NO) |  |
| Inductive proximity sensor (2-wire) |  |
Vacuum components
Table 4: Vacuum components and symbols
| Component description | Symbol |
| Vacuum generator |  |
| Vacuum generator with silencer |  |
| Vacuum suction cup |  |
Air filtration and regulation
Table 5: Air filtration and regulation components and symbols
| Component description | Symbol |
| Filter |  |
| Filter with manual drain |  |
| Filter with automatic drain |  |
| Vacuum filter |  |
| Coalescing filter without drain |  |
| Coalescing filter with manual drain |  |
| Coalescing filter with automatic drain |  |
| Filter regulator, manual drain |  |
| Filter regulator, automatic drain |  |
| Filter regulator, automatic drain, pressure gauge |  |
| Lubricator |  |
| Regulator with relieving |  |
| Regulator, return flow and pressure gauge |  |
| Electrical pressure regulator with gauge |  |
| Air filter, regulator, and lubricator (FRL) |  |
| Pressure gauge |  |
| Shut-off valve |  |
| Soft start valve |  |
Miscellaneous components
Table 7: Miscellaneous pneumatic components
| Component description | Symbol |
| Silencer |  |
| Manifold (Branching module/distributor) |  |
