Emerson LR128 Manual de instrucciones descargar pdf (Pagina 10)

Type LR128

Table 6. Type LR128 Main Valve Minimum Differential Pressures

(1)

MAIN VALVE

BODY SIZE

DIAPHRAGM

MINIMUM DIFFERENTIAL, PERCENT OF CAPACITY

For 90% Capacity For 100% Capacity

In. DN Diaphragm Code Diaphragm Material psid bar d psid bar d

1 25

17E68 (standard) Nitrile (NBR), Low Minimum Differential 30 2.1 30 2.1

17E97 Nitrile (NBR), High Erosion Resistance 35 2.5 35 2.5

17E88

Fluorocarbon (FKM),

High Temperature Capability

30 2.1 30 2.1

2 50

17E68 (standard) Nitrile (NBR), Low Minimum Differential 18 1.2 19 1.3

17E97 Nitrile (NBR), High Erosion Resistance 24 1.7 24 1.7

17E88

Fluorocarbon (FKM),

High Temperature Capability

18 1.2 19 1.3

3 80

17E68 (standard) Nitrile (NBR), Low Minimum Differential 21 1.5 28 1.9

17E97 Nitrile (NBR), High Erosion Resistance 23 1.6 23 1.6

17E88

Fluorocarbon (FKM),

High Temperature Capability

21 1.5 28 1.9

4 100

17E68 (standard) Nitrile (NBR), Low Minimum Differential 16 1.1 30 2.1

17E97 Nitrile (NBR), High Erosion Resistance 16 1.1 34 2.3

17E88

Fluorocarbon (FKM),

High Temperature Capability

16 1.1 30 2.1

1. See Table 1 for Type LR128 main valve structural design ratings and Table 2 for Type MR98H pilot rating.

SPRING RANGE,

SPRING PART NUMBER

AND SPRING COLOR

SET PRESSURE

(1)

BUILDUP OVER SET

PRESSURE NEEDED TO

BEGIN OPENING OF

MAIN VALVE

(2)

BUILDUP OVER SET

PRESSURE NEEDED TO

FULLY OPEN

MAIN VALVE

(3)

PRESSURE DROP BELOW

SET PRESSURE NEEDED

TO RESEAT PILOT

psig bar psig bar psig bar psig bar

25 to 75 psig / 1.7 to 5.2 bar

ERAA01910A0

(Green)

35 2.4 1 0.07 1 0.07 2 0.14

50 3.4 1 0.07 1 0.07 2 0.14

75 5.2 1 0.07 6 0.41 2 0.14

70 to 140 psig / 4.8 to 9.7 bar

ERAA01911A0

(Red)

70 4.8 1 0.07 4 0.28 5 0.34

100 6.9 1 0.07 10 0.69 5 0.34

125 8.6 1 0.07 13 0.90 5 0.34

140 9.7 1 0.07 16 1.1 5 0.34

130 to 200 psig / 9.0 to 13.8 bar

ERAA02889A0

(Blue)

130 9.0 1 0.07 14 0.97 6 0.41

150 10.3 1 0.07 14 0.97 6 0.41

175 12.1 1 0.07 17 1.2 6 0.41

200 13.8 1 0.07 17 1.2 6 0.41

150 to 375 psig / 10.3 to 25.9 bar

1N943427142

(Unpainted)

150 10.3 1 0.07 9 0.62 7 0.48

200 13.8 1 0.07 10 0.69 7 0.48

250 17.2 1 0.07 11 0.76 7 0.48

300 20.7 1 0.07 15 1.03 7 0.48

350 24.1 1 0.07 15 1.03 7 0.48

375 25.9 1 0.07 25 1.7 7 0.48

1. Set pressure is dened as the pressure at which the pilot starts-to-discharge.

2. Inlet pressure buildup over the set pressure at which the main valve starts audible ow.

3. Inlet pressure buildup over the set pressure for the main valve to achieve wide-open ow capacity.

Table 5. Build-up Pressure Needed to Begin Opening and Fully Open Main Valve and Pressure Drop Needed to Reseat Pilot

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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Emerson LR128 Manual de instrucciones Pagina 10

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