Emerson FISHER LR128 Series User manual

1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
Type LR128
Installation Guide
D103578X014
English – June 2021
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
Introduction
This installation guide provides instructions for installation,
startup and adjustment. To receive a copy of the
instruction manual, contact your local Sales O󰀩ce or view
a copy at www.fisher.com. For further information refer
to: Type LR128 Instruction Manual, D103578X012.
PED Categories
This product may be used as a pressure accessory with
pressure equipment in the following Pressure Equipment
Directive categories. It may also be used outside of the
Pressure Equipment Directive using sound engineering
practice (SEP) per table below. For information on the
current PED revision see Bulletin: D103053X012.
Specications
Main Valve Body Sizes, End Connection Styles and
Structural Design 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 3
Temperature Capabilities(1)
See Table 4
Installation
▲ WARNING
Only qualied 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. instructions.
If using a relief valve or backpressure
regulator on a hazardous or ammable
uid service, personal injury and property
damage could occur due to re or
explosion of vented uid that may have
accumulated. To prevent such injury or
damage, provide piping or tubing to vent
the uid to a safe, well-ventilated area or
containment vessel. Also, when venting
a hazardous uid, 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 uid 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 Specications
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 uid.
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 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.

Type LR128
2
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
BODYMATERIAL END CONNECTION STYLE(2)
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 O󰀩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.
Note
It is important that the relief valve or
backpressure regulator be installed
so that the vent hole in the spring
case is unobstructed at all times. For
outdoor installations, the relief valve
or backpressure regulator should be
located away from vehicular tra󰀩c and
positioned so that water, ice and other
foreign materials cannot enter the spring
case through the vent. Avoid placing the
relief valve or backpressure regulator
beneath eaves or downspouts and be
sure it is above the probable snow level.
△ CAUTION
When installing Type LR128 trim in
an existing Fisher™ E-body, damage
can result if ow is not in the correct
direction. Look at the body web to
conrm that ow is in the correct
direction—up through the center of
the cage and down through the cage
slots. Change the existing ow arrow
if necessary.
Overpressure Protection
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. Fisher
relief valve or backpressure regulators are NOT
ASME safety relief valves.
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 shuto󰀨
valves (if applicable).
Adjustment
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.
Taking Out of Service (Shutdown)
▲ WARNING
To avoid personal injury resulting
from sudden release of pressure,
isolate the relief valve or backpressure
regulator from all pressure before
attempting disassembly.
If pressure is introduced rst to
the main valve before the pilot, the
main valve may go wide-open and
subject the downstream system to
full inlet pressure.

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
GF04916
49B6019_A 48B2142_C
Type LR128
3
Parts List
Type LR128 Main Valve
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
Type MR98H Pilot
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
Figure 1. Type LR128 Main Valve Assembly
Figure 2. Type MR98H Pilot Assembly
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.
APPLY LUBRICANT / SEALANT(1):
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE FOR O-RINGS
L2 = ANTI - SEIZE COMPOUND
L4 = GRAPHITE SEALANT FOR GRAPHITE RING
1. Lubricants and sealant must be selected such that they meet the temperature requirements.
APPLY LUBRICANT / SEALANT(1):
L1 = LITHIUM POLYMER TYPE LUBRICANT (MULTI-PURPOSE GREASE)
L2 = ANTI-SEIZE LUBRICANT
S = MEDIUM STRENGTH THREADLOCKER
*Recommended spare part
*Recommended spare part
DN 50, 80 AND 100 / 2, 3 AND 4 IN. BODY SIZES DN 25 / 1 IN. BODY SIZE

Type LR128
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Emerson Automation Solutions
For further information on the current
PED revision see Bulletin: D103053X012
or scan the QR code.
Fisher.com
Americas
McKinney, Texas 75070 USA
T [phone]
[phone]
Europe
Bologna 40013, Italy
T [phone]
Asia Pacic
Singapore 128461, Singapore
T [phone]
Middle East and Africa
Dubai, United Arab Emirates
T [phone]
Table 3. Relief Set Pressure or Backpressure Control Ranges
PILOT SET PRESSURE RANGE SPRING WIRE DIAMETER SPRING FREE LENGTH SPRING PART NUMBER
AND COLOR
bar psig mm In. mm In.
Type MR98H
2.4 to 5.2
4.8 to 9.7
9.0 to 13.8
6.9 to 25.9
10.3 to 25.9(1)
35 to 75
70 to 140
130 to 200
100 to 375
150 to 375(1)
5.94
7.19
8.41
9.53
10.0
0.234
0.283
0.331
0.375
0.394
65.9
62.0
57.2
66.0
129
2.595
2.44
2.250
2.60
5.063
ERAA01910A0, Green
ERAA01911A0, Red
ERAA02889A0, Blue
ERCA04293A0, Unpainted
1N943427142, Unpainted
1. 150 to 375 psig / 10.3 to 25.9 bar spring range is only for the Type MR98HH pilot construction; consult the local Sales O󰀩ce for this option.
Table 4. Temperature Capabilities
17E68 NITRILE (NBR) (STANDARD) 17E97 NITRILE (NBR) 17E88 FLUOROCARBON (FKM)
-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 5.Type LR128 Maximum Pressure Ratings and Diaphragm Selection Information(1)
BODYSIZE DIAPHRAGM MATERIAL
MAXIMUM
OPERATING
INLET
PRESSURE(3)
MAXIMUM
OPERATING
DIFFERENTIAL
PRESSURE(3)
MAXIMUM
EMERGENCY
INLET AND
DIFFERENTIAL
PRESSURE
DIAPHRAGM
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 3 for pilot ratings.
2. For di󰀨erential 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 O󰀩ce for further information if a deviation from the standard
recommendations are required.
D103578X014 © 2013, 2021 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 06/21.
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not to be construed as warranties or guarantees, express or implied,
regarding the products or services described herein or their use or
applicability. All sales are governed by our terms and conditions, which
are available on request. We reserve the right to modify or improve the
designs or specications of our products at any time without notice.
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product. Responsibility for proper selection, use and maintenance of any
Emerson Process Management Regulator Technologies, Inc. product
remains solely with the purchaser.