What is Air Filter Regulator ?

A device that used primarily for regulate pressure and

filtering the air for stable source of air to process control

equipment such as current to pneumatic (I/P) transducers

and control valve positioners.

Why is it important to regulate Pressure?

• Pressure is one of the most important aspects of ANY piping system.

•If pressure is too low, the system is powerless.

•And if it is too high, overpressure affects filters, tools, sprayheads, instruments any vital tool in a liquid piping system.

Uses of a Pressure Regulator:

1. As a control element- to ensure that downstream pressure does not exceed a

set point.

2. As a safety device- to protect equipment from harmful overpressure.

3. Regulate to the correct pressure range - so that a flow system or piece of equipment can

operate safely and effectively.

Simple definition:

• A pressure regulator is a normally-open valve

that takes a high inlet pressure and converts it to a

lower, pre-set downstream pressure.

What a Pressure Regulator

WON’T Do:(common misconceptions)

1. It can’t convert a low inlet pressure to a

higher downstream pressure – it won’t

function like a pump.

2. It won’t control backpressure.

Based On:

Masoneilan®

Model 78 Series

Air Filter Regulators

Specification Data

CY7840

11/03

How It Works ?

Cut-away View of 78 Series Pressure Regulator

Rotation of the pressure

setting knob compresses

the range

spring against the

diaphragm plate, opening

the main supply

valve.

As the outlet pressure

increases, it flows through

the aspirator

and acts on the lower side

of the diaphragm causing

it to move upward until it

balances the force of the

range spring.

This

balanced condition

maintains constant output

pressure with

changes in supply pressure

and output load.

If the output pressure

rises above the set pressure, the

relief valve opens and

bleeds the excess pressure to

atmosphere.

Numbering System and General Data

Example of Air Filter Regulator use in Lgast.

Beach Valve

Pressure Control Valve

Conclusion The air filter regulator is a very important device in

process system to regulate the pressure and to filter the air.

Without this device, the over-pressure can occur and causing a damage to other device.

The wet and dirty air can cause corrosion and clogingto other equipments.

Thank You