D103578XUS2
Installation Guide
English – November 2014
Type LR128
www.fisherregulators.com
Introduction
This installation guide provides instructions for
installation, startup and adjustment. To receive a copy
of the instruction manual, contact your local Sales
Office or view a copy at www.fisherregulators.com. For
further information refer to: Type LR128 Instruction
Manual, D103578X012.
P.E.D. Categories
This product may be used as a pressure accessory
with pressure equipment in the following Pressure
Equipment Directive 97/23/EC categories.
PRODUCT SIZE
CATEGORY
FLUID TYPE
DN 25 and 50 / 1 and 2 in.
SEP
Liquid
DN 80 and 100 / 3 and 4 in.
II
Liquid
Specifications
Main Valve Body Sizes, End Connection Styles
and Body Ratings
(1)
See Table 1
Maximum Control Pressure
(1)
See Tables 1, 2 and 5
Minimum Set Pressure
(1)
1.7 bar / 25 psig
Set Pressure or Backpressure Control Ranges
(1)
See Table 4
Temperature Capabilities
(1)
See Table 3
Installation
!
WARnInG
Only qualified personnel shall install or
service a relief valve or backpressure
regulator. Relief valve or backpressure
regulator should be installed, operated
and maintained in accordance with
international and applicable codes
and regulations and Emerson Process
Management Regulator Technologies,
Inc. (Emerson™) instructions.
If using a relief valve or backpressure
regulator on a hazardous or flammable
fluid service, personal injury and
property damage could occur due to
fire or explosion of vented fluid that
may have accumulated. To prevent
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
such injury or damage, provide piping
or tubing to vent the fluid to a safe,
well-ventilated area or containment
vessel. Also, when venting a hazardous
fluid, the piping or tubing should be
located far enough away from any
buildings or windows so to not create
a further hazard and the vent opening
should be protected against anything
that could clog it.
Personal injury, equipment damage
or leakage due to escaping fluid
or bursting of pressure-containing
parts may result if this relief valve
or backpressure regulator is
overpressured or is installed where
service conditions could exceed the
limits given in the Specifications
section or where conditions exceed
any ratings of the adjacent piping or
piping connections.
To avoid such injury or damage,
provide pressure-relieving or pressure-
limiting devices (as required by
the appropriate code, regulation or
standard) to prevent service conditions
from exceeding limits.
Additionally, physical damage to the
relief valve or backpressure regulator
could result in personal injury and
property damage due to escaping fluid.
To avoid such injury and damage,
install the relief valve or backpressure
regulator in a safe location.
Clean out all pipelines before installation of the
relief valve or backpressure regulator and check to
be sure the relief valve or backpressure regulator
has not been damaged or has collected foreign
material during shipping. For NPT bodies, apply pipe
compound to the external pipe threads. For flanged
bodies, use suitable line gaskets and approved
piping and bolting practices. Install the relief valve
or backpressure regulator in any position desired,
unless otherwise specified, but be sure flow through
the body is in the direction indicated by the arrow
on the body.
