Bulletin 71.2:LR125
7
RESTRICTOR SETTING C
v
C
1
Setting 2 0.03
35
Setting 4 0.07
Setting 6 0.14
Setting 8 0.17
Table 8. Type 112 Restrictor Flow Coefcients
Table 7. Flow and Sizing Coefcients for Type MR95H Pilot
BODY SIZE,
IN. / DN
WIDE-OPEN COEFFICIENT
C
1
K
m
IEC SIZING COEFFICIENTS
X
T
F
D
F
L
C
v
1/2 / 15 2.9 35.5 0.79 0.797 0.70 0.89
K
m
= F
L
2
BODY SIZE
MAIN VALVE BODY,
LBS / kg
In. DN NPT or SWE CL150 RF CL300 RF CL600 RF
1 25 22 / 10 24 / 11 28 / 13 32 / 15
2 50 51 / 23 54 / 24 58 / 26 65 /29
3 80 103 / 47 107 / 49 110 / 50 123 / 56
4 100 139 / 63 145 / 66 159 / 72 192 / 87
Table 9. Approximate Weights Including Type MR95H Pilot and Restrictor
Cavitation Sizing
Note
The cavitation sizing graph in Figure 4
applies to water only. For cavitation
sizing for other liquids, contact your
local Sales Ofce.
Use Figure 4 to determine cavitation sizing of
Type LR125. The Cavitation Prediction Curve depicts
P1 and P2 combinations where cavitation is likely
to occur. The curve shape was determined through
analysis and lab conrmation on water. Determine the
desired inlet pressure and outlet pressure of the system
and nd the intersection of those values on the graph.
No Cavitation Region—Cavitation is not expected
in this region. Damage to regulator components and
piping is highly unlikely as a result of cavitation.
Note
Emerson
™
denies responsibility for
damage and voids the warranty if the
product is used within the Cavitation
Region (see Figure 4).
Cavitation Region—Cavitation may occur. Damage
to regulator components and piping is possible. The
risk of damage increases as P1 and P2 move down
and to the right on the table. Cavitation damage can
be avoided by dividing the total pressure drop into
stages so that the P1 and P2 combination falls into the
“No Cavitation Region” at every stage.
Capacity Information
Note
Flow capacities are laboratory veried;
therefore, regulators may be sized for
100% ow published capacities. It is not
necessary to reduce published capacities.
The capacity information on the following pages is based
on four % droop, 10%, 20%, 30% and 40%. Droop is
the negative control deviation or pressure offset below
the setpoint of the regulator.
Table 10 shows C
v
values at different % droop and
selected inlet pressures and outlet pressure settings.
Table 11 shows the liquid regulating capacities of the
Type LR125 regulator at selected inlet pressures and outlet
pressure settings. Flows are in gallons per minute (GPM)
and liters per minute (L/min) of water.
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