Pneumatic circuit is combination of various pneumatic elements arranged in a systematic manner to perform certain task. In this presentation you will able to learn different types of pneumatic circuits.

1. 1
Aldel Education Trust’s
ST. JOHN COLLEGE OF ENGINEERING AND
MANAGEMENT, PALGHAR
(ST. JOHN POLYTECHNIC)
DEPARTMENT OF MECHANICAL ENGINEERING
SUB: INDUSTRIAL HYDRAULICS AND
PNEUMATICS
TOPIC: PNEUMATIC CIRCUITS
PREPARED BY:-
PROF. PRANIT MEHATA
LECTURER, SJCEM
7972064172
DEPT. OF MECHANICAL ENGINEERING SJCEM

2. INTRODUCTION
A pneumatic circuit is defined as the graphical representation of pneumatic
components (using symbols) in a pneumatic operated machine.
It is the arrangement of pneumatic components in a systematic manner to
perform specific task.
Pneumatic circuits do not require return lines which saves cost of piping and
fittings.
It also reduces leakage problems.
The air from exhaust port is allowed to escape to the atmosphere.
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DEPT. OF MECHANICAL ENGINEERING

3. COMPONENTS OF PNEUMATIC
CIRCUIT
Compressor unit
Control valves
Actuators
Accessories
Main components of pneumatic
circuit
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DEPT. OF MECHANICAL ENGINEERING

4. TYPES OF PNEUMATICS
CIRCUITS
Pneumatic Circuits
Direct control circuits
Indirect (pilot) control circuits
Speed control circuits
Sequencing circuit
Logic controlled circuit
Time delay circuit
Piston continuous back and forth
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DEPT. OF MECHANICAL ENGINEERING

5. DIRECT CONTROL CIRCUITS
DIRECT
CONTROL
Actuate Single
Acting Cylinder
Actuate Double
Acting Cylinder
Actuate
Unidirectional
motor
Actuate
Bidirectional
motor
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DEPT. OF MECHANICAL ENGINEERING

6. ACTAUTION OF SINGLE ACTING
CYLINDER
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 Purpose:
Movement of single acting
cylinder is to produce push
force by using compressed air.
Applications:
Clamping of workpiece
Sheet metal press machines
DEPT. OF MECHANICAL ENGINEERING SJCEM

7. ACTAUTION OF DOUBLE ACTING
CYLINDER
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 Purpose:
Movement of double acting
cylinder is to produce to and
fro motion by suing
compressed air
Applications:
Material handling equipment's
like cranes, lifts etc.
DEPT. OF MECHANICAL ENGINEERING

8. ACTAUTION OF
UNIDIRECTIONAL MOTOR
8
 Purpose:
To obtain rotary
movement of air motor
in one direction.
Applications:
Hand tools
DEPT. OF MECHANICAL ENGINEERING

9. ACTAUTION OF BIDIRECTIONAL
MOTOR
9
 Purpose:
To obtain rotary motion in both
clockwise and counterclockwise
direction of bidirectional air
motor.
Applications:
Hand tools like drills, grinders
etc.
DEPT. OF MECHANICAL ENGINEERING

10. INDIRECT CONTROL CIRCUITS
INDIRECT
CONTROL
Actuate Single
Acting Cylinder
Actuate Double
Acting Cylinder
Actuate
Unidirectional
motor
Actuate
Bidirectional
motor
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DEPT. OF MECHANICAL ENGINEERING

11. ACTAUTION OF SINGLE ACTING
CYLINDER
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 Purpose:
Movement of single acting
cylinder is to produce push
force using impulse operation
Applications:
Pilot control of single acting
cylinder.
DEPT. OF MECHANICAL ENGINEERING

12. ACTAUTION OF DOUBLE ACTING
CYLINDER
12
 Purpose:
Movement of double acting
cylinder is to produce
reciprocating motion using
impulse action.
Applications:
Pilot control of double acting
cylinder.
DEPT. OF MECHANICAL ENGINEERING

13. ACTAUTION OF
UNIDIRECTIONAL MOTOR
13
 Purpose:
Rotary movement of
unidirectional motor using
impulse action .
Applications:
Pilot control of unidirectional
air motor
DEPT. OF MECHANICAL ENGINEERING

14. ACTAUTION OF BIDIRECTIONAL
MOTOR
14
 Purpose:
Rotary movement of
bidirectional motor using
impulse action .
Applications:
Pilot control of bidirectional
air motor
DEPT. OF MECHANICAL ENGINEERING

15. SPEED CONTROL CIRCUIT
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When speed of actuator is varied by using flow control valve in the
pneumatic circuit it is called as Speed control circuit.
DEPT. OF MECHANICAL ENGINEERING
SPEED
CONTROL
Speed control of
Single Acting
Cylinder
Speed control of
Double Acting
Cylinder
Speed control of
Unidirectional
motor
Speed control of
Bidirectional
motor

16. SPEED CONTROL OF SINGLE
ACTING CYLINDER
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 Purpose:
To control the speed of
forward movement of
piston.
Applications:
Punch press operations,
cranes
DEPT. OF MECHANICAL ENGINEERING

17. SPEED CONTROL OF DOUBLE
ACTING CYLINDER
17
 Purpose:
Movement of DA cylinder
at slow/fast rate using FCV
Applications:
Punch press operations,
cranes
DEPT. OF MECHANICAL ENGINEERING

18. SPEED CONTROL OF
UNIDIRECTIONALAIR MOTOR
18
 Purpose:
Vary the rotational speed of
unidirectional air motor
Applications:
Hand tool
DEPT. OF MECHANICAL ENGINEERING

19. SPEED CONTROL OF
BIDIRECTIONALAIR MOTOR
19
 Purpose:
Vary the rotational speed of
unidirectional air motor
Applications:
Hand tool
DEPT. OF MECHANICAL ENGINEERING

20. SEQUENCING CIRCUIT
20
When numbers of actuators (linear/rotary) are operated one
after another in sequential manner it is called as Sequencing
circuits.
DEPT. OF MECHANICAL ENGINEERING
SEQUENCING
CIRCUITS
Sequencing
of SAC with
DAC
Sequencing
of two SAC
Sequencing
of Two DAC
Sequencing
of SAC/DAC
with Motor
Sequence valves
Roller operated valves
Cam operated
Limit switches
Electrical switch
Sequencing
Devices

21. SEQUENCING OF SAC WITH DAC
DEPT. OF MECHANICAL ENGINEERING
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22. SEQUENCING OF DAC WITH SAC
DEPT. OF MECHANICAL ENGINEERING
22

23. SEQUENCING OF SAC WITH SAC
DEPT. OF MECHANICAL ENGINEERING
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24. SEQUENCING OF DAC WITH DAC
DEPT. OF MECHANICAL ENGINEERING
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25. SEQUENCING OF CYLINDER
WITH MOTOR
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DEPT. OF MECHANICAL ENGINEERING

26. LOGIC CONTROLLED CIRCUIT
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When logic gates (AND & OR) is used to design pneumatic circuit is
called as logic controlled circuit.
DEPT. OF MECHANICAL ENGINEERING
LOGIC
CONTROLLED
CIRCUIT
Actuate SAC with
Shuttle Valve (OR
gate)
Actuate SAC with
Twin Pressure Valve
(AND gate)

27. ACTAUTION OF SAC WITH OR
GATE(SHUTTLE VALVE)
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DEPT. OF MECHANICAL ENGINEERING

28. ACTAUTION OF SAC WITH AND
GATE(TWIN PRESSURE VALVE)
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DEPT. OF MECHANICAL ENGINEERING

29. TIME DELAY CIRCUIT
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When actuation main DC valve is allowed after predetermined time delay
using time delay valve is called as time delay circuit
DEPT. OF MECHANICAL ENGINEERING
TIME DELAY
CIRCUIT
Time delay for
Actuation of SAC
Time delay for
Actuation of DAC
Time delay for
advancement and
retraction

30. TIME DELAY CIRCUIT FOR SAC
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DEPT. OF MECHANICAL ENGINEERING

31. TIME DELAY CIRCUIT FOR DAC
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DEPT. OF MECHANICAL ENGINEERING

32. TIME DELAY CIRCUIT FOR
ADVANCEMENT & RETRACTION
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Mr. Pranit Mehata
7972064172
pranitmehta86@gmail.com
THANK YOU