Emerson Fisher LR125 - Page 6

Type LR125
6
Table 3. Outlet (Control) Pressure Ranges
PILOT
OUTLET PRESSURE RANGE SPRING WIRE DIAMETER SPRING FREE LENGTH
SPRING PART NUMBER
AND COLOR
psig bar In. mm In. mm
Type MR95H
15 to 30
25 to 75
70 to 150
1.0 to 2.1
1.7 to 5.2
4.8 to 10.3
0.207
0.234
0.283
5.26
5.94
7.19
2.50
2.60
2.44
63.5
65.9
62.0
ERCA04288A0, Yellow
ERAA01910A0, Green
ERAA01911A0, Red
Type MR95HP
15 to 100
80 to 400
1.0 to 6.9
5.5 to 27.6
0.281
0.375
7.14
9.53
2.50
2.60
63.5
63.5
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 -20 to 150°F / -29 to 66°C 0 to 150°F / -18 to 66°C 0 to 250°F / -18 to 121°C
(1)(2)
General Applications
Best for low pressure di󰀨erential 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 200°F / 93°C in hot water.
2. For di󰀨erential pressures above 400 psig / 28 bar diaphragm temperature is limited to 150°F / 66°C.
Table 5. Main Valve Maximum Pressure Ratings, Diaphragm Selection Information and Main Spring Selection
(1)
BODY SIZE
DIAPHRAGM MATERIAL
MAXIMUM OPERATING
INLET PRESSURE
(4)
MAXIMUM OPERATING
DIFFERENTIAL PRESSURE
(3)(4)
MAXIMUM EMERGENCY INLET
AND DIFFERENTIAL PRESSURE
MAIN SPRING COLOR
In. DN psig bar psig bar psid bar d
1 25
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Black and Yellow
17E97 Nitrile (NBR)
300 20.7 300 20.7 300 20.7 Black and Yellow
600 41.4 600 41.4 600 41.4 Black and White
(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Black and Yellow
600 41.4 500 34 600 41.4 Black and White
(2)
2 50
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Green and White
17E97 Nitrile (NBR)
300 20.7 300 20.7 300 20.7 Green and White
600 41.4 600 41.4 600 41.4 Red
(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Green and White
600 41.4 500 34 600 41.4 Red
(2)
3 80
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Light Blue and White
17E97 Nitrile (NBR)
300 20.7 300 20.7 300 20.7 Light Blue and White
600 41.4 600 41.4 600 41.4 Black and White
(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Light Blue and White
600 41.4 500 34 600 41.4 Black and White
(2)
4 100
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Green and White
17E97 Nitrile (NBR)
300 20.7 300 20.7 300 20.7 Green and White
600 41.4 600 41.4 600 41.4 Red and White
(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Green and White
600 41.4 500 34 600 41.4 Red and White
(2)
1. See Table 1 for main valve structural design ratings and Table 2 for pilot ratings.
2. The black and white, red and red and white springs are only recommended for applications where the maximum inlet pressure can exceed 300 psig / 20.7 bar.
3. Maximum di󰀨erential 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 O󰀩ce for further information if a deviation from the standard
recommendations are required.
Table 6. Main Valve Minimum Dierential Pressures
(1)
MAIN VALVE
BODY SIZE
MAIN SPRING PART NUMBER AND COLOR
DIAPHRAGM
MATERIAL
MINIMUM DIFFERENTIAL, PERCENT OF CAPACITY
For 90% Capacity For 100% Capacity
In.. DN psid bar d psid bar d
1 25
GE12727X022, Black and Yellow
17E68 and 17E88 30 2.1 30 2.1
17E97 35 2.5 35 2.5
19B2401X022, Black and White 17E88 and 17E97 43 3.0 43 3.0
2 50
18B2126X022, Green and White
17E68 and 17E88 18 1.2 19 1.3
17E97 24 1.7 24 1.7
18B5955X012, Red 17E88 and 17E97 29 2.0 31 2.1
3 80
19B0781X022, Light Blue and White
17E68 and 17E88 21 1.5 28 1.9
17E97 23 1.6 23 1.6
19B0782X022, Black and White 17E88 and 17E97 32 2.2 38 2.6
4 100
18B8501X022, Green and White
17E68 and 17E88 16 1.1 30 2.1
17E97 16 1.1 34 2.3
18B8502X022, Red and White 17E88 and 17E97 21 1.5 40 2.8
1. See Table 1 for structural design ratings and Table 2 for pilot rating.