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PNEUMATIC
ACTUATOR
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Pneumatic instrument
INTRODUCTION
Pneumatic instrument systems were the main method of
controlling and monitoring industrial plant.
Electrical instrument systems, with faster response times
and ease of installation, have already overtaken pneumatic
systems and are now used for most applications previously
considered to be the duty of their pneumatic counterpart.
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Pneumatic instrument
The slow response and costly installation problems of
Pneumatic system are however accepted when the prevailing
conditions make electrical systems unacceptable.
Pneumatic instruments also find service in the smaller one offcontrol system, where transmission lags are small due to the
size of the loop.
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Pneumatic instrument
1. FLAPPER/NOZZLE.
PNEUMATIC INSTRUMENTS RELAY ON THE ACCURATE CONVERTION
OF MECHANICAL MOVEMENT TO A PROPORTIONAL PNEUMATIC
SIGNAL.
2. ELECTRICAL/PNEUMATIC CONVERTION INSTRUMENTS.
3. DIAPHGRAM AIR MOTORS.
4. PNEUMATIC CYLINDER AIR MOTORS.
5. TYPES OF CYLINDERS.
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FLAPPER
.6MM
.2MM
O/PSUPPLY
RESTRICTOR
NOZZLE
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PNEUMATIC CONTROL VALVE
USAGE-1)WHERE COMPLETE PROCESS CUT OFF REQD
2)PRECISE POSITIONING OF VALVE REQD FOR
CONTROL LOOP IN AUTO/MANUAL
COMPONENT-
1) CONTROL VALVE
2) POSITIONER
3) E/P CONVERTER
4) AIR FILTER CUM REGULATOR
5) AIR LOCK UP RELAY
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Type 3582 and3582i ValvePositioners
POSITIONER
INPUT SIGNAL-1) 3-15 psi FOR
PNEUMATIC
2)4-20 m.a DCFOR ELECTRO-PNEUMATIC
TYPE-1) ELECTRO-PNEUMATIC
2)PNEUMATIC
OUTPUT- 0.3 BAR MOREPRESSURE THAN REQD. BY
ACTUATOR.
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SOLENOID
GENERAL A solenoid valve consists of two major
component parts:
1. The driver (solenoid operator)
2. The flow controller (valve)
OPEARTING VOLTAGE-230/110 V.AC-24/48/240 V DC
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TYPES-
1) DOUBLE ACTING
2) DOUBLE ACTING DOUBLE ENDED
3)TANDEM CYLINDER
4)SINGLE ACTING ( FOR FAIL SAFE
OPERATION BY SPRING RETURN)
5) DOUBLE ENDED SINGLE ACTING
6)ROTARY ACTUATOR
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