pneumatic components

1. PNEUMATICS COMPONENTS

2. PNEUMATICS COMPONENTS
During the few decades various
automation techniques has been
introduced in the field of
manufacturing in order to enhance
the overall industrial productivity.
Among the various technologies that are
playing important role in rapid growth
of Indian industries, fluid power is
unique.
During past decade number of
applications have been
developed based on
Pneumatics.

3. C O M P R E S S E D A I R G E N E R A T I O N &
C O N TA M I N AT I O N C O N T R O L

4. AIR GENERATION AND DISTRIBUTION
• The generation of
compressed air starts with
compression.
• The compressed air flows
through an entire series of
components before
reaching the consuming
device.
• The equipment to be
considered in the
generation and preparation
of air include :
– Inlet filter
– Air compressor
– Air reservoir
– Air dryer
– Air filter with water
separator
– Pressure regulator
– Air lubricator as required
– Drainage points

5. INTAKE FILTER
• It is used to clean & filter the air used for systems.
• Before the surrounding air enters the compressor, it must pass
through a filter to remove most of the dirt & other solid
contaminants.
• These filters can be of dry or wet type depending on the
compressor manufacturer & the application.

6. AIR COMPRESSORS
• A compressor is the most common industrial energy supply unit that
convert mechanical energy into fluid energy.
• It is design to take in air at atmospheric pressure and deliver the
received air to a closed system with a certain volumetric flow rate, at
a higher pressure.

7. RECIPROCATING PISTON COMPRESSORS
• A piston compresses the air drawn in via an inlet valve. The air is
passed on via an outlet valve.
• Reciprocating compressors are very common and provide a
wide range of pressures and delivery rates.
• For higher pressures multistage compression is used with inter-
cooling between each stage of compression.

8. RECIPROCATING PISTON COMPRESSORS
• A reciprocating compressor
consist of the crankshaft by
a connecting rod.
• Crankshaft is externally
rotate by a electric motor.
• Crankshaft & connecting
rod convert rotary motion
into reciprocating motion.

9. FLOW COMPRESSOR
• These are particularly suitable
for large delivery quantities.
• Flow compressors are made
in axial or radial form. The air
is made to flow by means of
one or several turbine wheels.
• The kinetic energy is
converted into pressure
energy.
• In the case of an axial
compressor, the air is
accelerated in the axial
direction of flow by means of
blades.

10. RESERVOIRS
• A reservoir is configured
downstream of a compressor to
stabilise compressed air.
• A reservoir compensates the
pressure fluctuations when the
compressed air is taken from the
system.
• If the pressure in the reservoir
drops below a certain value, the
compressor will compensate until
the set higher value is reached
again.
• This has the advantage that the
compressor does not need to
operate continuously.

11. RESERVOIRS

12. AIR DRYERS
• The most common type of dryer
today is the refrigeration dryer.
• With refrigerated drying, the
compressed air is passed
through a heat exchanger
system through which a
refrigerant flows.
• The aim is to reduce the
temperature of the air to a dew
point which ensures that the
water in the air condenses and
drops out in the quantity
required.

13. COMPRESSED AIR FILTER
• The selection of the correct filter
plays an important role in
determining the quality and
performance of the working system
which is to be supplied with
compressed air.
• One characteristic of compressed-
air filters is the pore size.
• The pore size of the filter
element indicates the minimum
particle size which can be
filtered out of the compressed
air.

14. LUBRICATOR
• Lubrication of the
compressed air should
therefore always be limited
to the plant sections which
require lubrication.
• For this purpose, lubricators are
fitted to feed the compressed
air with specially selected oils.
• Oils which are introduced
into the air from the
compressor are suitable for
the lubrication of control
system components.

15. SERVICE UNIT
• The individual functions of
compressed air preparation, i.e.
filtering, lubricating and
regulating , can be fulfilled by
individual components.
• These functions have often been
combined into one unit, i.e. the
service unit or FLR.
• Service units are connected upstream
of all pneumatic systems.

17. ACTUATORS AND OUTPUT DEVICES
• An actuator is an output device for the conversion of supply
energy into useful work.
• The output signal is controlled by the control system, and the
actuator responds to the control signals via the control element.
• Other types of output devices are used to indicate the status of the
control system or actuators, e.g. a pneumatically actuated visual
display.
• The pneumatic actuator can be described under two groups, linear
and rotary :
• Linear motion
– Single-acting cylinders
– Double-acting cylinders
• Rotary motion
– Air motor
– Semi-Rotary actuator

18. SINGLE-ACTING CYLINDERS
• With single-acting cylinders compressed air is applied on only one
side of the piston face. The other side is open to atmosphere.
• The cylinder can produce work in only one direction. The return
movement of the piston is effected by a built-in spring or by the
application of an external force.
• The spring force of the built-in spring is designed to return the piston
to its start position with a reasonably high speed under no load
conditions.

19. DOUBLE-ACTING CYLINDERS
• The construction principle of a double-acting cylinder is similar to that
of the single-acting cylinder.
• But no return spring, and the two ports are used alternatively as supply
and exhaust ports.
• The double-acting cylinder has the advantage that the cylinder is able
to carry out work in both directions of motion.
• The force transferred by the piston rod is somewhat greater for the
forward stroke than for the return stroke as the effective piston surface
is reduced on the piston rod side by the cross- sectional area of the
piston rod.

20. DOUBLE-ACTING CYLINDER WITH CUSHIONING
• If large masses are moved by a cylinder, cushioning is used in the end
positions to prevent sudden damaging impacts. Before reaching the end
position, a cushioning piston interrupts the direct flow path of the air to
the outside.
• Instead a very small and often adjustable exhaust aperture is open.
• For the last part of the stroke the cylinder speed is progressively reduced.
If the passage adjustment is too small, the cylinder may not reach the
end position due to the blockage of air.

21. TANDEM DOUBLE-ACTING CYLINDER
• The tandem cylinder incorporates the features of two double- acting
cylinders which have been joined to form a single unit. By this
arrangement and with the simultaneous loading of both pistons, the
force on the piston rod is almost doubled.
• This design is suitable for such applications where a large force is
required but the cylinder diameter is restricted.

22. MULTI-POSITION CYLINDERS
• The multi-position cylinder consists of two or several double- acting
cylinders, which are interconnected.
• The individual cylinders advance when pressure is applied. In the case of
two cylinders with different stroke lengths, four positions are obtained.

23. ROTARY CYLINDERS
• With this design of double-acting cylinder, the piston rod has a geartooth
profile.
• The piston rod drives a gear wheel, and a rotary movement
results from a linear movement.
• The range of rotation varies from 45o, 90o, 180o, 270oto 360o.
• The torque is dependent on pressure, piston surface and gear ratio;
values of roughly up to 150 Nm are possible.

24. DIAPHRAGM CYLINDER
• This is the simplest form of single acting cylinder. In diaphragm cylinder , piston is replaced
by a diaphragm is replaced by a diaphragm of hard rubber, plastic or metal clamped
between the two halves of a metal casing expanded to form a wide, flat enclosure.
• The operating stem which takes place of the piston rod in diaphragm cylinder can also be
designed as a surface element so as to act directly as a clamping surface for example.
• Only short operating strokes can be executed by a diaphragm cylinder, up to a maximum of
50 mm. This makes the diaphragm type of cylinder particularly adaptable to clamping
operations.
• Return stroke is accomplished by a spring built into the assembly or by the tension of
diaphragm itself in the case of very short stroke.
• Diaphragm cylinders are used for short stoke application like clamping, riveting, lifting,
embossing and riveting

25. AIR MOTORS
• Devices which transform pneumatic energy into mechanical rotary
movement with the possibility of continuous motion are known as
pneumatic motors.
• The pneumatic motor with unlimited angle of rotation has become
one of the most widely used working elements operating on
compressed air.
• Pneumatic motors are categorised according to design:
– Piston motors
– Sliding-vane motors
– Gear motors
– Turbines (high flow)

26. PNEUMATIC GRIPPERS
• Pneumatic grippers
– a) Radial grippers
– b) Parallel grippers
– c) 3-point grippers
– d) Angle grippers

27. VACUUM GENERATORS
• Handling with suction cups is generally a simple, low-cost and
reliable solution.
• Suction cups allow the handling of different workpieces with
weights ranging from a few grammas right up to several
hundred kilo grammas.
• They come in a wide variety of different shapes, such as
universal, flat or bellows suction cups, for example.

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30. PNEUMATIC VALVES
• Valve is a device which is used to control out put of the circuit.
• The main purpose of a valve in pneumatics or hydraulic circuit is to
control Final output.
• Valves are divided into number of groups according to what
they control.
• Function
– Example: DCV, FCV, PCV.
• Design
– Example: Spool valve, poppet valve.
• Method of actuation
– Manual, mechanical, pneumatic, electric.
• Mounting angle
– Manifold, in line, sub plate.
• Application
– Speed control, signal processing, proportional valve.

31. GRAPHICAL REPRESENTATION
• PORT & POSITIONS TABLE:
Port Alphabetic system No. sys. Comment
Pressure port P 1 Supply port
Working port A 2 3/2 DC valve
Working ports A, B 4, 2 4/2 or 5/2 DC valve
Exhaust port R 3 3/2 DC valve
Exhaust ports R, E,S 3, 5 3/2 DC valve
Pilot port Z or Y 12 Pilot line (1 2)
Pilot port Z 14 Pilot line (1 4)
Pilot port Z or Y 10 Pilot line (flow closed)
Internal pilot port Pz, Py 81, 91 Auxiliary pilot air

32. PORTS AND POSITIONS (WAYS)

33. 2/2 WAY VALVE
• 2/2 way Normally closed valve
• Initially no flow from1 to 2, switched to flow from 1 to 2. figure
indicates 2/2 way valve normally closed and that when activated
connects pressure port (1) to the output port (2) and therefore
it is used for ON/OFF switch.
1 (P)
2 (A)

34. 3/2 WAY VALVE
• 3/2 way normally closed valve
• Initially no flow from 1to 2 but flow
from 2 to 3 switched to flow from 1 to 2
and 3 closed.
• Figure shows 3/2 way valve normally
closed in which pressure port 1 is off
and output port (2)
exhausting via exhaust port (3). when it
is activated the pressure is applied to
the output port directly and the exhaust
port will be closed.
2
1 3

35. 4/2 WAY VALVE
• 4/2 way valve
• Initially flow from 1 to 2 and 4 to 3.switched to flow or from 1 to
4 and from 2 to 3. A 4/2 way valve is shown in figure in which
pressure is applied to the output port while the output port
exhaust through the exhaust port. When activated the pressure
port (1) is connected to the output port (4) while output port (2)
exhaust through the exhaust port (3).
4 2
1 3

36. 5/2 WAY VALVE
• 5/2 way valve
• Initially flow from 1 to 2 and flow 4
to 5, 3 closed. Switched to flow
from 1 to 4 and from 2 to 3, 5
closed. Figure indicates 5/2 way
valve in which pressure is applied
to the output port while output
port exhaust through the exhaust
port. When activated pressure (1)
is connected to the output port (4)
exhaust through exhaust port (5) 3
will be closed.
4 2
1
5 3

37. METHODS OF ACTUATION

38. METHODS OF ACTUATION

39. SHUTOFF VALVES

40. NON RETURN VALVE

41. PILOT OPERATED CHECK
VALVE

42. TWO PRESSURE VALVE

43. SHUTTLE VALVE

44. FLOW CONTROL VALVES

45. LOGICS
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• AND logic
• OR logic
• NOT logic
• NAND logic
• NOR logic
• EX-OR logic

46. PNEUMATIC PRESET COUNTER
The pneumatic preset counter counts
pneumatic signals, decrementing
from a preset number. When zero is
reached, the counter emits a
pneumatic output signal.
It has 4 ports
1 (P) – pressure port / input
port
2 (A) – output port
12 (Z) – pulse counting port 10 (Y)
– Reset port

47. ADJUSTABLE PRESSURE SEQUENCE VALVE