Description; Installation - Pressure Tech LF-792 Series Operating And Service Manual

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1. Description

The LF-792 is a single stage piston sensed pressure regulator for gas applications,

capable of a maximum 1034 bar inlet pressure. This can then be controlled to a range

of outlet pressures depending upon the sensing arrangement and loading mechanism.

As standard, the LF-792 comes with a Tecasint seat for regulators (with Cv 0.1/0.05)

and 316-SS main valve, which provides a positive shut off and can withstand 1034 bar

working pressure.

The balanced designed regulators (with Cv 0.3) are supplied with PEEK and 316-SS

main valve, as standard, which provides a positive shut off and can withstand 690 bar

working pressure. This also allows for high accuracy control of both low and high

downstream pressures, depending upon the sensing arrangement and loading

mechanism.

Before system start-up, it is recommended that all systems be pressure tested, leak

tested and purged with an inert gas such as nitrogen.

Prior to placing into service ensure that the regulator is in the fully closed position,

with the adjusting mechanism turned completely anti-clockwise.

Check the model number reference to ensure that the pressure range complies with

the installation requirements.

Visually inspect the regulator for any signs of damage or contamination. If any foreign

materials are present and cannot be removed from the regulator, or if the threads on

the regulator appear to be damaged, please contact the office immediately to arrange

for the regulator to be returned for service.

The Inlet and Outlet ports are clearly marked. Select the correct size and type of

connection fittings for these ports which are indicated in the regulators part number.

Both medium pressure type (MP) 'A' and National Pipe Thread (NPT) 'N' options are

available on this regulator. For NPT threads, ensure that PTFE tape is applied correctly

to the fittings, applying two overlapping layers in the direction of the thread, taking

care that the tape does not come into contact with the first thread.

Any gauge ports on the regulator will be 1/4" NPT unless otherwise stated. If any

gauge port is not required, ensure that the port is plugged prior to installation.

The media supplied to the regulator must be clean. Contamination can damage the

seat which may cause the regulator to fail. Filtration suited to the application is

recommended upstream of the regulator.

Should further assistance or information be required in relation to installation of any

Pressure Tech regulator please contact the office, giving reference to the regulators

part number and/or serial number.

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