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Bulletin 71.4:LR128

Capacity Information

Note

Flow capacities are laboratory

veried; 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 percentages of pressure build-up over set

pressure (10%, 20%, 30% or 40%).

Table 12 shows C

values at different percentages of

pressure build-up over set pressure and selected

set pressures.

Table13showstheliquidowcapacitiesofthe

Type LR128 relief valve or backpressure regulator

at different percentages of pressure build-up over

set pressure and selected set pressure. Flows are in

gallonsperminute(GPM)andlitersperminute(L/min)

of water.

CRITERIA

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)

GeneralApplications

Best for low pressure differential

and cold temperature

service 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.

Table 10. Diaphragm Material Selection Information

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 11. Approximate Weights Including Type MR98H Pilot and Restrictor

RESTRICTOR SETTING C

Setting 2 0.03

Setting 4 0.07

Setting 6 0.14

Setting 8 0.17

Table 9. Type 112 Restrictor Flow Coefcients

Table 8. Flow and Sizing Coefcients for Type MR98H Pilot

BODY SIZE

WIDE-OPEN COEFFICIENT

IEC SIZING COEFFICIENTS

1/2 in. / DN 15 3.4 120 35.3 0.88 0.787 0.78 0.94

= F

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Emerson LR128 Scheda Tecnica Pagina 10

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