Emerson Fisher LR125 Series User manual

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
Ofce 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
Specications
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 qualied 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 uid 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 uid
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 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
regulator could result in personal
injury and property damage due to
escaping uid. 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 anged
bodies, use suitable line gaskets and approved
piping and bolting practices. Install the 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.
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 trafc 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.

2
Type LR125
Table 1. Type LR125 Main Valve Body Sizes, End Connection Styles, Structural Design Ratings and
Maximum Operating Inlet Pressure(1)
MAIN VALVE BODY SIZE MAIN VALVE BODY
MATERIAL END CONNECTION STYLES(2)
STRUCTURAL DESIGN
RATING(3)
MAXIMUM OPERATING
INLET PRESSURE(3)
DN In. 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 41.4 600
CL150 RF 20.0 290 20.0 290
CL300 RF 51.7 750
41.4 600CL600 RF 103 1500
PN 16/25/40 RF(4) 40.0 580
CF8M
Stainless steel
NPT (1 and 2 in. only) 99.2 1440 37.9 550
CL150 RF 19.0 275 19.0 275
CL300 RF 49.6 720
37.9 550CL600 RF 99.2 1440
PN 16/25/40 RF(4) 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 pressure.
4. Not available for DN 100 / 4 in. body size.
Table 2. Pilot Maximum Operating Pressure(1)(2)
PILOT BODY SIZE BODY AND SPRING CASE
MATERIAL MAXIMUM INLET PRESSURE MAXIMUM OUTLET PRESSURE
Type MR95H 1/2 NPT Steel
Stainless steel
20.7 bar / 300 psig
20.7 bar / 300 psig
20.7 bar / 300 psig
20.7 bar / 300 psig
Type MR95HP 1/2 NPT Steel
Stainless steel
41.4 bar / 600 psig
41.4 bar / 600 psig
41.4 bar / 600 psig
37.9 bar / 550 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.
Table 3. Outlet (Control) Pressure Ranges
PILOT OUTLET PRESSURE RANGE SPRING WIRE DIAMETER SPRING FREE LENGTH SPRING PART NUMBER
AND COLOR
bar psig mm In. mm In.
Type MR95H
1.0 to 2.1
1.7 to 5.2
4.8 to 10.3
15 to 30
25 to 75
70 to 150
5.26
5.94
7.19
0.207
0.234
0.283
63.5
65.9
62.0
2.50
2.60
2.44
ERCA04288A0, Yellow
ERAA01910A0, Green
ERAA01911A0, Red
Type MR95HP 1.0 to 6.9
5.5 to 27.6
15 to 100
80 to 400
7.14
9.53
0.281
0.375
63.5
63.5
2.50
2.60
ERCA04294A0, Unpainted
ERCA04293A0, Unpainted
Table 4. Diaphragm Material Selection Information
CRITERIA DIAPHRAGM MATERIAL
17E68 Nitrile (NBR) (standard) 17E97 Nitrile (NBR) 17E88 Fluorocarbon (FKM)
Liquid Temperature -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)(2)
General Applications
Best for low pressure differential
service or cold temperature
applications
Best for abrasive or
erosive service applications
Best for high temperature
applications
Heavy Particle Erosion Fair Excellent Good
1. Fluorocarbon (FKM) is limited to 93°C / 200°F in hot water.
2. For differential pressures above 28 bar / 400 psig diaphragm temperature is limited to 66°C / 150°F.

3
Type LR125
BODY SIZE DIAPHRAGM
MATERIAL
MAXIMUM OPERATING
INLET PRESSURE(4)
MAXIMUM OPERATING
DIFFERENTIAL PRESSURE(3)(4)
MAXIMUM EMERGENCY INLET
AND DIFFERENTIAL PRESSURE MAIN SPRING COLOR
DN NPS bar psig bar psig bar d psid
25 1
17E68 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Black and Yellow
17E97 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Black and Yellow
41.4 600 41.4 600 41.4 600 Black and White(2)
17E88
Fluorocarbon (FKM)
20.7 300 20.7 300 20.7 300 Black and Yellow
41.4 600 34 500 41.4 600 Black and White(2)
50 2
17E68 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Green and White
17E97 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Green and White
41.4 600 41.4 600 41.4 600 Purple(2)
17E88
Fluorocarbon (FKM)
20.7 300 20.7 300 20.7 300 Green and White
41.4 600 34 500 41.4 600 Purple(2)
80 3
17E68 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Light Blue and White
17E97 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Light Blue and White
41.4 600 41.4 600 41.4 600 Black(2)
17E88
Fluorocarbon (FKM)
20.7 300 20.7 300 20.7 300 Light Blue and White
41.4 600 34 500 41.4 600 Black(2)
100 4
17E68 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Green and White
17E97 Nitrile (NBR) 20.7 300 20.7 300 20.7 300 Green and White
41.4 600 41.4 600 41.4 600 Red(2)
17E88
Fluorocarbon (FKM)
20.7 300 20.7 300 20.7 300 Green and White
41.4 600 34 500 41.4 600 Red(2)
1. See Table 1 for main valve structural design ratings and Table 2 for pilot ratings.
2. The black and white, purple, black and red springs are only recommended for applications where the maximum inlet pressure can exceed 20.7 bar / 300 psig.
3. Maximum differential pressures may be lower for applications where cavitation may be present.
4. 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. Main Valve Maximum Pressure Ratings, Diaphragm Selection Information and Main Spring Selection(1)
Overpressure Protection
The recommended pressure limitations are
stamped on the regulator nameplate. Some type of
overpressure protection is needed if the actual inlet
pressure exceeds the maximum operating outlet
pressure rating. Overpressure protection should
also be provided if the regulator inlet pressure
is greater than the safe working pressure of the
downstream equipment.
Regulator operation below the maximum pressure
limitations does not preclude the possibility of
damage from external sources or debris in the line.
The regulator should be inspected for damage after
any overpressure condition.
Startup
The 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.
Adjustment
To change the outlet pressure, loosen the jam nut
and turn the adjusting screw clockwise to increase
outlet pressure or counterclockwise to decrease it.
Monitor the outlet pressure with a test gauge during
the adjustment. Tighten the jam nut to maintain the
desired setting.
Taking Out of Service (Shutdown)
!
WARNING
To avoid personal injury resulting from
sudden release of pressure, isolate the
regulator from all pressure before
attempting disassembly.
Table 6. Main Valve Minimum Differential Pressure(1)
MAIN VALVE BODY SIZE
MAIN SPRING PART NUMBER AND COLOR DIAPHRAGM MATERIAL
MINIMUM DIFFERENTIAL, PERCENT OF CAPACITY
For 90% Capacity For 100% Capacity
DN In. bar d psid bar d psid
25 1 GE12727X022, Black and Yellow 17E68 and 17E88 2.1 30 2.1 30 17E97 2.5 35 2.5 35
19B2401X022, Black and White 17E88 and 17E97 3.0 43 3.0 43
50 2 18B2126X022, Green and White 17E68 and 17E88 1.2 18 1.3 19 17E97 1.7 24 1.7 24
18B5955X012, Red 17E88 and 17E97 2.0 29 2.1 31
80 3 19B0781X022, Light Blue and White 17E68 and 17E88 1.5 21 1.9 28 17E97 1.6 23 1.6 23
19B0782X022, Black and White 17E88 and 17E97 2.2 32 2.6 38
100 40 18B8501X022, Green and White 17E68 and 17E88 1.1 16 2.1 30
17E97 1.1 16 2.3 34
18B8502X022, Red and White 17E88 and 17E97 1.5 21 2.8 40
1. See Table 1 for Type LR125 main valve structural design ratings and Table 2 for pilot rating.

4
Type LR125
*Recommended spare part
Figure 1. Type LR125 Main Valve
APPLY LUBRICANT / SEALANT(1):
L1 = LITHIUM POLYMER TYPE LUBRICANT (MULTI-PURPOSE GREASE)
L2 = ANTI-SEIZE LUBRICANT
S = MEDIUM STRENGTH THREADLOCKER
1. Lubricants and sealant must be selected such that they meet the temperature requirements.
21
20
19
17
2
14
L2
5
70
10
11
7
8
L1
L1
SS
22
15
4
6
18
16
63
12
28
9
13
1
23
L1
L1
L2
48B2142_C
DN 50, 80 AND 100 / 2, 3 AND 4 IN. BODY SIZES
49B6019_A
DN 25 / 1 IN. BODY SIZE
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
Parts List
Type LR125 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
13 Flanged Hex Nut
14* Top Plug O-ring
15 Stem
16* Back-up Ring
17 Upper Spring Seat
18* O-ring
19 Indicator Fitting or
Travel Indicator Plug
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

5
Type LR125
Parts List (continued)
Type MR95H/MR95HP Pilot
Key Description
1 Regulator Body
2 Spring Case
3* Orice
4* Valve Plug Assembly
5 Valve Plug Guide
6 Stem Assembly
7 Stem Guide Bushing
8 Lower Spring Seat
9 Upper Spring Seat
11 Regulator Spring
12* Diaphragm
15 Adjusting Screw
16 Cap Screw
17 Jam Nut
18 Nameplate Drive Screw
26 Inner Valve Spring
63 Bottom Plug Seal
*Recommended spare part
GF04914
APPLY LUBRICANT / SEALANT(1):
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE
L2 = ANTI-SEIZE COMPOUND
1. Lubricant and sealant must be selected such that they meet the temperature requirements.
2. Apply L2 (anti-seize compound) on key 16 for Stainless steel bolts.
L2
L2
L2
L1
L2
15 17
8
12
1
20
6
3
26
9
2
11
16
7
4
5
63
L2(2)
Figure 2. Type MR95H/MR95HP Pilot Assembly

Type LR125
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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.
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and maintenance of any Emerson Process Management Regulator Technologies, Inc. product remains solely with the purchaser.
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