| Clamp & Cylinder Symbols |
 |
Push Clamp or cylinder, single-acting |
 |
Push Clamp or cylinder, double-acting |
 |
Pull clamp, single-acting |
 |
Swing clamp, single-acting |
 |
Swing clamp, double-acting |
 |
Extending clamp, single-acting |
 |
Extending clamp, double-acting |
 |
Work support, spring extended |
 |
Work support, fluid advanced |
 |
Work support, air advanced |
| Power Source Symbols |
 |
Power source (simplified) |
 |
Electric Power unit, consisting of a fluid reservoir, pump, electric motor, pressure-relief valve, pressure switch, clamping valve, and gauge. |
 |
Electric motor, showing direction of rotation |
 |
Constant displacement pump |
 |
Variable displacement pump |
 |
Fluid reservoir |
 |
Fluid filter |
| Valve Symbols |
 |
3/2 directional-control valve (3-way, 2-position),
complete symbol with solenoid operator and
spring return (normally open) |
 |
Boxes showing valve positions (two). For valves
with spring return, the neutral position is shown at left (0). |
 |
Inlet and outlet connections are drawn at the
neutral-position box, and are designed by capital letters:
P
A, B, C...
R, S, T
L
Z, Y, Z |
= Inlet pressure from pump
= Operating connections
= Outlet return (tank)
= Leakage line
= Control Lines |
|
 |
Flow lines and directions are shown in each valve-position box. Lines show flow path, arrows show flow direction. Shutoffs are designated by capped-off lines inside the box. |
 |
Valves can be normally open, as shown on top (clamped in neutral position), or normally closed, as shown on bottom (unclamped in neutral position) |
 |
Valve operators are shown outside the boxes |
 |
Solenoid operated |
 |
Spring operated (or returned) |
 |
Manually operated |
 |
Detent position |
 |
Lever operated |
 |
Foot-pedal operated |
 |
Push-button operated |
 |
Cam-roller operated |
 |
Plunger operated |
 |
Air-pilot operated |
 |
2/2 directional-control valve, normally closed on top, normally open below. |
 |
4/2 directional-control valve, for double-acting clamps |
 |
Sequence valve, with unrestricted return line |
 |
Pressure-reducing valve, with unrestricted return line |
 |
Check valve |
 |
Remote-controlled check valve (pilot
operated) |
 |
Shutoff valve |
 |
Pressure-relief valve |
 |
Flow control valve, with unrestricted
return line |
| Accessory Symbols |
 |
Operating line, pressure or return |
 |
Control line, for transmitting control/pilot
signals |
 |
Leakage line, for carrying away fluid leakage |
 |
Flexible line, such as hydraulic hose |
 |
Line connection |
 |
Line crossing, without connection |
 |
Pressure-connection point, such as a port |
 |
Bleeding point |
 |
Quick disconnect, coupled |
 |
Quick disconnect, decoupled |
 |
Rotary coupling (2 passage shown) |
 |
Accumulator |
 |
Gauge |
 |
Pressure switch |
 |
Air filter/regulator/lubricator |
