Pedagogia

Electrical, pneumatic and logic symbols

Energy conversion

Transfer of ener gy
Line

Compressor

Constant displacement
pump

Flexible line

Pressure source
– pneumatic

Pressuresource
– hydraulic

Valves
Directional control valves

Actuation methods
Manual operation

2 (A)
General

Via push
button

Via pull

Via
lever

Via
pedal

Mechanical actuationVacuum pump

Pneumatic fixed
displacement motor

Hydraulic motor,
adjustable, with one
direction of flow

Pneumatic fixed
displacement motor with
two directions of flow

Hydraulic motor,adjustable, with two
directions of flow

Line connection

Silencer

Via stem

Via spring

Via roller

Air outlet with
connection facility

Air outlet without
connection facilityPressure connection
point, closed

Quick coupling,
connected

Pneumatic motor with
restricted angle of
rotation

2 (A)

1 (P)
2/2-way valve,
normally closed position

1 (P)
2/2-way valve,normally open position

2 (A)

Crossing line

Closed exhaust port

Variable displacement
pump

Rotary connection
with one path

Quick coupling with
mechanically opening
non-returnvalves,
connected

Roller lever in
one direction
only under
tension

1 (P)
3 (R)
3/2-way valve,
normally closed position

1 (P)
3 (R)
3/2-way valve,
normally open position
4 (A)

2(A)
1 (P)
3 (R)
3/3-way valve,
mid-position closed

Actuated in initial position

4 (A)

Double-acting
pneumtic cylinder

Single-acting pneumatic
cylinder, return movement
via springDouble-acting pneumatic
cylinder with adjustable
cushioning at both ends

Double-acting pneumatic Telescopic hydraulic
cylinder with through
cylinder
piston rod

Pressure intensifier for
twodifferent media

Pressure medium
converter

Quick coupling,
disconnected,
line closed

Quick coupling,
disconnected,
Line open

Filter
Shut-off valve
(simplified representation)...