2 pneumatic actuator

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May 24, 2012 PMI Revision 00 1

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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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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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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2 pneumatic actuator

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