Dome loaded section overview0 pages

"

IVP REGULATORS

nnnn

Dome loaded section overview

nnnn

Regulators

nnnn

Function

nnnn

Pressure regulators (reducers or controllers)

nnnn

control the outlet pressure over a range of

nnnn

varying inlet pressures and flows. Regulators

nnnn

are sometimes called "Forward Regulators" to

nnnn

limit confusion with Back Pressure Maintaining

nnnn

Valves.

nnnn

Remote control

nnnn

A small, low flow, spring loaded regulator or

nnnn

proportional valve can Pe connected to the

nnnn

external vent port of a larger dome loaded

nnnn

regulator. The outlet set pressure of the dome

nnnn

loaded valve is therefore controlled by adjusting

nnnn

the spring loaded regulator.

nnnn

It is ideal that a spring loaded regulator

nnnn

with down stream release is used.

nnnn

Dome Loaded Regulators

nnnn

How does it work

nnnn

We can divide the valve into three modules

nnnn

of construction.

nnnn

• Control Module

nnnn

• Sensing Module

nnnn

• Metering Module

nnnn

PORT '0 PRESSURISE THI

nnnn

DOME FROM AN EXTERNAL

nnnn

SOURCE

nnnn

■TAKE-OFF TO

nnnn

UNE LOAD THE

nnnn

:X)Mr

nnnn

CONTROL MODULE

nnnn

DOME

nnnn

Control Module

nnnn

With Dome Loaded Regulators the down

nnnn

stream pressure is set by increasing or

nnnn

decreasing the pressure in the dome

nnnn

via pressurising the dome with an inert gas.

nnnn

The supply can either come via an external

nnnn

source (e.g. gas bottle) or in the case of inert

nnnn

medias from the line loading. The dome loaded

nnnn

valves are supplied un-charged. Do not use

nnnn

liquid.

nnnn

lENCELOAD

nnnn

{DOME PRESSURE)

nnnn

ISTREAM PRESSURE

nnnn

CHAMBER

nnnn

SENSING MODULE

nnnn

DOME

nnnn

Sensing Module

nnnn

The sensing module compares the down

nnnn

stream pressure on one side of the module

nnnn

to the applied reference load on the other.

nnnn

In matching the forces generated on each

nnnn

face provides the mechanical link to open

nnnn

and close the valve. Thompson Valves use

nnnn

two approaches, they are

nnnn

• Diaphragm

nnnn

• Metering

nnnn

Diaphragm-rubber (elastomer), metal

nnnn

The flexible diaphragm keeps the dome

nnnn

pressure isolated from the outlet side. As the

nnnn

areas on both sides of the diaphragm are the

nnnn

same then the set outlet pressure is about the

nnnn

same as the dome pressure.

nnnn

60

nnnn

Tel: +44 (0)1202 697521 Fax: +44 (0)1202 605385

"