D103576XUS2
Installation Guide
English – September 2015
Type LR125
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 LR125 Instruction
Manual, D103576X012.
P.E.D. Categories
This product may be used as a safety 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 Structural Design Ratings
(1)
See Table 1
Outlet (Control) Pressure Ranges
See Table 3
Main Valve Minimum Differential Pressure
(1)
See Table 6
Maximum Inlet Pressure
(1)
Type LR125 Main Valve:
See Table 1
Type MR95H/MR95HP Pilot:
See Table 2
Type 112 Restrictor:
103 bar / 1500 psig
Temperature Capabilities
(1)
See Table 4
Main Valve Internal Inlet Strainer Sizes
DN 25 / 1 in.:
12 Mesh (1.68 mm / 0.0661 in.)
(2)
DN 50, 80 and 100 / 2, 3 and 4 in.:
10 Mesh (2 mm / 0.0787 in.)
(2)
Installation
!
WARNING
Only qualified personnel shall install or
service a regulator. Regulators should
be installed, operated and maintained
in accordance with international and
applicable codes and regulations and
Fisher
®
instructions.
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
2. Nominal sieve opening.
If the regulator vents fluid or a
leak develops in the system, it
indicates that service is required.
Failure to take the regulator out of
service immediately may create a
hazardous condition.
Personal injury, equipment damage
or leakage due to escaping fluid
or bursting of pressure containing
parts may result if this 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
regulator could result in personal
injury and property damage due to
escaping fluid. To avoid such injury
and damage, install the regulator in a
safe location.
Clean out all pipelines before installation of the
regulator and check to be sure the 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 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.
Note
It is important that the regulator be
installed so that the vent hole in the
spring case is unobstructed at all
times. For outdoor installations, the
regulator should be located away
from vehicular traffic and positioned
so that water, ice and other foreign
materials cannot enter the spring
case through the vent. Avoid placing
the regulator beneath eaves or
downspouts and be sure it is above
the probable snow level.
