Emerson FISHER LR128 Series User manual

D103578XUS2
Installation Guide
English – November 2014 Type LR128
www.sherregulators.com
Introduction
This installation guide provides instructions for
installation, startup and adjustment. To receive a copy
of the instruction manual, contact your local Sales
Ofce or view a copy at www.sherregulators.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

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

service a relief valve or backpressure
regulator. Relief valve or backpressure


international and applicable codes
and regulations and Emerson Process

Inc. (Emerson™) instructions.
If using a relief valve or backpressure


property damage could occur due to


1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.


well-ventilated area or containment



buildings or windows so to not create





or bursting of pressure-containing

or backpressure regulator is





piping connections.

provide pressure-relieving or pressure-
limiting devices (as required by

standard) to prevent service conditions
from exceeding limits.

relief valve or backpressure regulator




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 anged
bodies, use suitable line gaskets and approved
piping and bolting practices. Install the relief valve
or backpressure regulator in any position desired,
unless otherwise specied, but be sure ow through
the body is in the direction indicated by the arrow
on the body.

2
Type LR128
Note

backpressure regulator be installed

case is unobstructed at all times. For








or downspouts and be sure it is above

CAUTION

®E-body, damage






if necessary.
Overpressure
Maximum inlet pressures depend upon body
materials and temperatures. Refer to the nameplate
for the maximum inlet pressure of the relief valve
or backpressure regulator. The relief valve or
backpressure regulator should be inspected for
damage after any overpressure condition. 
valve or backpressure regulators are NOT ASME
safety relief valves.
Table 1. Type LR128 Main Valve Body Sizes, End Connection Styles, Structural Design Ratings and
Maximum Operating Inlet Pressures(1)
MAIN VALVE
BODY SIZE MAIN VALVE
BODY MATERIAL END CONNECTION STYLE
STRUCTURAL
DESIGN RATING(3)
MAXIMUM OPERATING
RELIEF (INLET)
PRESSURE INCLUDING
BUILD-UP(3)
MAXIMUM
OPERATING OUTLET
PRESSURE
DN In. bar psig bar psig bar psig
25, 50,
80 and
100
1, 2,
3 and
4
WCC Steel
NPT or SWE (1 and 2 in. only) 103 1500 31.0 450 31.0 450
CL150 RF 20.0 290 20.0 290 20.0 290
CL300 RF 51.7 750
31.0 450 31.0 450CL600 RF 103 1500
PN 16/25/40 RF 40.0 580
CF8M
Stainless steel
NPT (1 and 2 in. only) 99.2 1440 31.0 450 31.0 450
CL150 RF 19.0 275 19.0 275 19.0 275
CL300 RF 49.6 720
31.0 450 31.0 450CL600 RF 99.2 1440
PN 16/25/40 RF 40.0 580
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
2. Ratings and end connections for other than ASME standard can usually be provided. Contact your local Sales Ofce for assistance.
3. Maximum cold working pressure (CWP) per ASME B16.34 or product bulletin limit, whichever is lowest. Temperature may decrease these maximum pressures.
Table 2. Type MR98H Pilot Maximum Cold Working Pressure(1)(2)
BODY SIZE BODY AND SPRING CASE MATERIAL MAXIMUM INLET PRESSURE MAXIMUM OUTLET PRESSURE
1/2 NPT Steel or Stainless steel 31.0 bar / 450 psig 31.0 bar / 450 psig
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
2. Temperature and/or the body end connection may decrease these maximum pressures.
Startup
The relief valve or backpressure regulator is factory
set at approximately the midpoint of the spring range
or the pressure requested, so an initial adjustment
may be required to give the desired results. With
proper installation completed and relief valves properly
adjusted, slowly open the upstream and downstream
shutoff valves (if applicable).

To change the outlet pressure, remove closing
cap or loosen the locknut and turn the adjusting
screw clockwise to increase outlet pressure or
counterclockwise to decrease pressure. Monitor
the outlet pressure with a test gauge during the
adjustment. Replace closing cap or tighten the locknut
to maintain the desired setting.

!
WARNING

from sudden release of pressure,

regulator from all pressure before
attempting disassembly.


main valve may go wide-open and

full inlet pressure.

3
Type LR128
Figure 1. Type LR128 Main Valve Assembly
Figure 2. Type MR98H Pilot Assembly
GF04916
*Recommended spare part
*Recommended spare part
Parts List

Key Description
1 Valve Body
2 Bonnet Assembly
3 Cap Screw
4 Hex Nut
5 Top Plug
6* O-ring
7 Cage
8* Cage O-ring
9* Diaphragm
10 O-ring
11 Bottom Plug
12 Main Valve Spring
14* Top Plug O-ring
13 Flanged Hex Nut
15 Stem
16* Back-up Ring
17 Upper Spring Seat
18* O-ring
19 Indicator Fitting
20 Indicator Washer
21 Indicator Cover
22 Indicator Protector
23 Inlet Strainer
24 Nameplate
25 Flow Arrow
26 Drive Screw
28* O-ring
63 Pipe Plug
70* O-ring
129 Socket Head Screw
130 Lock Washer

Key Description
1 Regulator Body
2 Spring Case
3* Orice
4* Valve Plug
5 Bottom Plug
7 Valve Plug Guide
8 Lower Spring Seat
9 Upper Spring Seat
10 Pusher Post
11 Regulator Spring
12* Diaphragm
15 Adjusting Screw
16 Cap Screw
17 Jam Nut
28 Lock Washer
29* Gasket
31 Locknut
58 Washer
63* Bottom Seal Plug
 
(1):



(1):



1. Lubricants and sealants must be selected such that they meet the temperature requirements.
2. Apply L2 (anti-seize compound) on key 16 for stainless steel bolts.
3. Apply L4 (graphite sealant) instead of L1 (general purpose PTFE or lithium grease) on key 63 for graphite ring.
1. Lubricants and sealant must be selected such that they meet the temperature requirements.
49B6019_A 48B2142_C
3
24
26 25
22
15
4
6
18
16
63
12
28
9
130
1
23
21
20
19
17
2
14
L2
5
70
10
11
129
7
8
L1
L1
L1
L2
L1
L1
21
20
19
17
2
14
L2
5
70
10
11
7
8
L1
L1
S
S
22
15
4
6
18
16
63
12
28
9
13
1
23
L1
L1
L2
L2 15 17
11
31
29
L2 10
L2(2) 16
12
28
58
63
2
9
L2
7
3
5
8
1
4
OR(3)
L1
L4
L2
L2
L2

Type LR128
©Emerson Process Management Regulator Technologies, Inc., 2013, 2014; All Rights Reserved
The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls International LLC,
a business of Emerson Process Management.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties
or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specications
of such products at any time without notice.
Emerson Process Management Regulator Technologies, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use
and maintenance of any Emerson Process Management Regulator Technologies, Inc. product remains solely with the purchaser.
Industrial Regulators
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. [phone]
Asia-Pacic
Shanghai 201206, China
Tel: [phone]
Europe
Bologna 40013, Italy
Tel: [phone]
Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]
Natural Gas Technologies
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. [phone]
Asia-Pacic
Singapore 128461, Singapore
Tel: [phone]
Europe
Bologna 40013, Italy
Tel: [phone]
Chartres 28008, France
Tel: [phone]
Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]
TESCOM
Emerson Process Management
Tescom Corporation
USA - Headquarters
Elk River, Minnesota 55330-2445, USA
Tels: [phone]
[phone]
Europe
Selmsdorf 23923, Germany
Tel: [phone]
Asia-Pacic
Shanghai 201206, China
Tel: [phone]
For further information visit www.fisherregulators.com
Table 4. Relief Set Pressure or Backpressure Control Ranges
PILOT SET PRESSURE RANGE SPRING WIRE DIAMETER  SPRING PART NUMBER
AND COLOR
bar psig mm In. mm In.
Type MR98H
1.7 to 5.2
4.8 to 9.7
9.0 to 13.8
10.3 to 25.9(1)
25 to 75
70 to 140
130 to 200
150 to 375(1)
5.94
7.19
8.41
10.0
0.234
0.283
0.331
0.394
65.9
62.0
57.2
129
2.595
2.44
2.250
5.063
ERAA01910A0, Green
ERAA01911A0, Red
ERAA02889A0, Blue
1N943427142, Unpainted
1. 150 to 375 psig / 10.3 to 25.9 bar spring range is for the Type MR98HH pilot construction.
BODY SIZE 
MAXIMUM
OPERATING
INLET
PRESSURE(3)
MAXIMUM
OPERATING
DIFFERENTIAL
PRESSURE(3)
MAXIMUM
EMERGENCY
INLET AND
DIFFERENTIAL
PRESSURE

STYLE
DN In. bar psig bar d psid bar d psid
25 1
17E68 Nitrile (NBR), Low temperature 31.0 450 27.6 400 31.0 450
130
17E97 Nitrile (NBR), High-pressure and/or erosion resistance 31.0 450 31.0(2) 450(2) 31.0 450
17E88 Fluorocarbon (FKM), High aromatic hydrocarbon content resistance 31.0 450 31.0(2) 450(2) 31.0 450
50 2
17E68 Nitrile (NBR), Low temperature 31.0 450 27.6 400 31.0 450
17E97 Nitrile (NBR), High-pressure and/or erosion resistance 31.0 450 31.0(2) 450(2) 31.0 450
17E88 Fluorocarbon (FKM), High aromatic hydrocarbon content resistance 31.0 450 31.0(2) 450(2) 31.0 450
80 3
17E68 Nitrile (NBR), Low temperature 24.8 360 20.7 300 31.0 450
17E97 Nitrile (NBR), High-pressureand/or erosion resistance 31.0 450 31.0(2) 450(2) 31.0 450
17E88 Fluorocarbon (FKM), High aromatic hydrocarbon content resistance 31.0 450 31.0(2) 450(2) 31.0 450
100 4
17E68 Nitrile (NBR), Low temperature 24.8 360 20.7 300 31.0 450
17E97 Nitrile (NBR), High-pressure and/or erosion resistance 31.0 450 31.0(2) 450(2) 31.0 450
17E88 Fluorocarbon (FKM), High aromatic hydrocarbon content resistance 31.0 450 31.0(2) 450(2) 31.0 450
1. See Table 1 for main valve structural design ratings and Table 4 for pilot ratings.
2. For differential pressure above 27.6 bar d / 400 psid diaphragm temperatures are limited to 66°C / 150°F.
3. These are recommendations that provide the best regulator performance for a typical application. Please contact your local Sales Ofce for further information if a deviation from
the standard recommendations are required.
Table 5.Type LR128 Maximum Pressure Ratings and Diaphragm Selection Information(1)
 17E97 NITRILE (NBR) 
-29 to 66°C / -20 to 150°F -18 to 66°C / 0 to 150°F -18 to 121°C / 0 to 250°F(1)
1. Fluorocarbon (FKM) is limited to 93°C / 200°F in hot water.
Table 3. Temperature Capabilities