Electrical, pneumatic and logic symbols
Energy conversion
Compressor
Constant displacement pump
Transfer of ener gy Line
Flexible line
Pressure source – pneumatic
Pressure source – hydraulic
Valves Directional control valves
Actuation methods Manual operation
General
Via push button
Via pull
Via lever
Via pedal
Mechanical actuation Variable displacement pump
Pneumatic fixed displacement motor
Hydraulic motor, adjustable, with one direction of flow
Vacuum pump
Pneumatic fixed displacement motor with two directions of flow
Hydraulic motor, adjustable, with two directions of flow
Line connection
Crossing line
Closed exhaust port
Silencer
Via spring
Via roller
Air outlet with connection facility
Air outlet without connection facility
Pressure connection point, closed
Quick coupling, connected
Pneumatic motor with restricted angle of rotation
Via stem
Rotary connection with one path
Quick coupling with mechanically opening non-return valves, connected
2 (A)
2 (A)
1 (P) 2/2-way valve, normally closed position
1 (P) 2/2-way valve, normally open position
2 (A)
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)
4 (A)
Double-acting pneumtic cylinder
Single-acting pneumatic cylinder, return movement via spring
Double-acting pneumatic cylinder with adjustable cushioning at both ends
Double-acting pneumatic Telescopic hydraulic cylinder with through cylinder piston rod
Pressure intensifier for two different media
Pressure medium converter
Quick coupling, disconnected, line closed
Quick coupling, disconnected, Line open
Filter Shut-off valve (simplified representation)
Filter with water separator, manually operated
2 (B)
Direct via pneumatic actuation
Via differential Spring centered pressure actuation
4 (A)
Cooler with volumetric flow lines to show flow direction of coolant
Via solenoid with one active coil
Via solenoid, e. g. with two counteracting solenoids
Via electric stepper motor
1 (P) 3 (R) 4/3-way valve, mid-position closed
Combined actuation
Via solenoid or manual operation
Via solenoid or manual override and pilot valve
4 (A)
2 (B)
4 (A)
3 (S) 1 (P) 5/2-way valve
5 (R)
Detent
Over-centre device
Service unit Reservoir (simplified representation)
Temperature sensor
Pressure gauge
Temperature gauge
Connection designations
Back pressure nozzle
Nozzle in general, sender nozzle for air barrier
Fluid level gauge
Tachometer
Receiver nozzle (with air supply) for air barrier
Pneumatic proximity switch, actuated by permanent magnet
ISO/ for 2/2DIS and 11727 3/2-way valves 1 P 2 A 3 R – 4 – 5 10* Z Z 12 – 14
for 4/2and 4/3-way valves P B R A – – Y Z
for 5/2and 5/3-way valves P B S A R – Y Z
* Control port, on valves with normally open position (NOT function)
053 614 GB © Festo Didactic GmbH & Co. www.festo.com/didactic
Directional control valve with intermediate switching positions and two end positions
Equation
E 0 1
A 0 1
A=E
E 0 1
A 1 0
A=E
Representation to ISO 1219/1 pneumatic
Symbol to DIN 40900/12
1
E
Representation to DIN EN 60617-7 electrical
A
A
E
E
1
E
A
A
A
E
E
E1 E2 0 0 0 1 1 0 1 1
A 0 1 1 1
A=E1∨E2
E1 E2 0 0 0 1 1 0 1 1
A 0 0 0 1
A=E1∧E2
E1 E2 0 0 0 1 1 0 1 1
A 0 0 1 0
A=E1∧E2
E1 E2 0 0 0 1 1 0 1 1
A 1 0 1 1
A=E1∨E2
E1 E2 0 0 0 1 1 0 1 1
A 1 0 0 0
A=E1∨E2
E1 E2
≥1
A
A
A
E1 E1
Implication
2-way flow control valve
Flow control valve, adjustable, any actuation
Flow divider
Nor
Flow control valve, adjustable, mechanical actuation against spring
A
E1 E2
&
A
A E1
E1 E2
E2
A
E1 E2
&
A
A E2
E1 E2
E1
A
3 (R)
2 (A)
1 (P) Pressure relief valve, adjustable
Nand
1 (P) Pressure sequence valve with exhaust, adjustable 2 (A)
Memory
Non-return valve Non-return valve Non-return valve without spring with spring
Timer
Dual-pressure valve
– adjustable – Switch-on delayed
A
A
E1
Shuttle valve
One-way flow control valve, adjustable
E1 E2 0 0 0 1 1 0 1 1
S 1 0 0 0 E 0 1 1
R 0 0 1 0
A
E2
E1 E2
≥1
A
A
E1
t expired
0 0 1
E2
K1
K
A 1 1 1 0
A 1 1 0 0
E2
E1
A=E1∧E2
E1 E2
&
A
E2 A
A
E1
K1
E2
B 0 0 1 1 A 0 0 1
R S
R S
K
E2 AB
B A S
A
S
K K
R
R
B A
K
E
t1
A
A
E K
E
A P R
Timer Quick exhaust valve
≥1
E1
1 (P) 3 (R) Pressure regulating valve, relieving type, adjustable
1 (P) Pressure regulating valve, non-relieving, adjustable
E1 E2
E1
Pressure valve
E2
E2
Flow control valve
2 (A)
Special symbols
Reflex sensor
Inhibition
Lubricator
Dryer
Flow meter (volume)
And
2 (B)
3 (S) 1 (P) 5/3-way valve, mid-position closed
General explanatory symbol
Pneumatic linear unit
Flow meter (flow)
2 (B)
1 (P) 3 (R) 4/3-way valve, mid position working lines exhausted
Flow control valve with constant restriction
Mechanical actuating components Other symbols Other devices
Or
Electrical actuation
Via solenoid and pilot valve Cooler without volumetric flow lines to show flow direction of coolant
Negation
Pressure actuation
Via electric motor with continuous rotation
Filter with water separator, automatic
Identity
Function table
2 (B)
1 (P) 3 (R) 4/2-way valve
5 (R)
Single-acting pneumatic cylinder, return movement via external force
Designation
2 (A)
1 (P) 3 (R) 3/3-way valve, mid-position closed
Actuated in initial position
Comparison of logic elements
– adjustable – Switch-off delayed
E 0 1 0
t expired
0 0 1
A 0 1 0
E
t2
A
A
E K
E
A P R
