Pressure Tech LF-301 SERIES Operating And Service Manual

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THE LF-301 SERIES

Operating and Service Manual

Series includes all variants of LF-301/311 and CYL-301/311

Issue B

January 2016

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TABLE OF CONTENTS

1. Description ............................................................................................................................. 3

2. Installation ............................................................................................................................. 3

3. Operation ............................................................................................................................... 4

4. Special Conditions for Safe Use ............................................................................................. 4

5. Hazardous Location Usage ..................................................................................................... 4

6. Servicing and Maintenance .................................................................................................... 4

6.1. Servicing the LF-301 ................................................................................................ 5

6.1.1. Accessing the Main Valve Assembly ........................................................ 5

6.1.2. Adjusting the Set Point ............................................................................ 6

6.1.3. Figure 1 – Sectional View of the LF-301 ................................................... 7

7. Technical Data ........................................................................................................................ 8

8. Warranty Statement .............................................................................................................. 8

Annex A. LF-310/311 – ‘Solid Disk’ Main Valve Design ............................................................. 9

A.1. Description.............................................................................................................. 9

A.2. Servicing .................................................................................................................. 9

A.2.1. Figure 2 – Detail A: LF-310/311 ‘Solid Disk’ MVA (sectional) .................. 9

A.2.2. Figure 3 – Exploded View of LF-310/311 ‘Solid Disk’ MVA ..................... 9

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1. Description

The LF-301 provides a compact and economical solution for controlling pressures up to
180bar on low flow applications. Ideal for first stage pressure let down where basic pressure
control is required. A small piston sensing element allows low torque adjustment with a
range of springs with fine pressure adjustment. The unique soft seat design ensures
particles flow over its surface, rather than perpendicular to it, which helps minimise damage
from potential particles in the system.

Pressure Equipment Directive (PED) 2014/68/EC Declaration
This equipment is designed and manufactured in accordance with Sound Engineering
Practice (SEP) Article 4, Paragraph 3 of the directive 2014/68/EC. As such, CE marking must
not be applied. The equipment is marked under section 3.3 of Essential Safety Requirements
of the directive.

2. Installation

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 British

Standard Pipe (BSPP) ‘B’ and National Pipe Thread (NPT) ‘N’ options are available on this

regulator. Use the correct dowty or bonded seal for BSPP connections, self centering seals
are recommended. 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.