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 Office 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.
