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Bulletin 71.4:63EG-98HM

Installation

Not all codes or regulations will permit these units to be used

as nal overpressure protection devices.

On the Type 63EG relief valve, normal pressure drop assists

shutoff. Therefore, leakage may result during any reverse

pressure drop condition.

These valves may be installed in any position desired as long

as the ow through the main valve complies with the ow

arrow on the body. Pilot exhaust must be piped downstream of

the relief valve plug or to a drain.

For safety during shutdown, vent valves will be required

immediately upstream and downstream of the main valve on

backpressure or bypass installations.

Universal NACE Compliance

Optional materials are available for applications

handling sour gases. These constructions comply

with the recommendations of NACE International sour

service standards.

The manufacturing processes and materials used by

Emerson Process Management Regulator Technologies, Inc.

assure that all products specied for sour gas service comply

with the chemical, physical and metallurgical requirements

of NACE MR0175 and/or NACE MR0103. Customers have

the responsibility to specify correct materials. Environmental

limitations may apply and shall be determined by the user.

Table 4. Flow Coefcients at Maximum Rated Travels

Table 6. Minimum and Maximum Differential Pressures and Build-up Required for Wide-Open Flow

BODY SIZE,

NPS / DN

MAIN VALVE SPRING RANGE,

SPRING PART NUMBER

AND COLOR

MINIMUM DIFFERENTIAL

PRESSURE REQUIRED

FOR FULL STROKE

(1)

BUILD-UP OVER SET

PRESSURE REQUIRED

FOR FULL STROKE

MAXIMUM DIFFERENTIAL

PRESSURE

psi bar psi bar psi bar

2 / 50

10 to 40 psig / 0.69 to 2.8 bar

14A6768X012 Yellow

22 1.5 7 0.48 40 2.8

30 to 125 psig / 2.1 to 8.6 bar

14A6626X012 Green

30 2.1 9 0.6 125 8.6

85 to 400 psig / 5.9 to 27.6 bar

14A6628X012 Red

90 6.2 23 1.6 400 28

3 / 80

10 to 40 psig / 0.69 to 2.8 bar

14A6771X012 Yellow

19 1.3 5 0.34 40 2.8

30 to 125 psig / 2.1 to 8.6 bar

14A6629X012 Green

25 1.7 7 0.48 125 8.6

85 to 400 psig / 5.9 to 27.6 bar

14A6631X012 Red

60 4.1 17 1.2 400 28

4 / 100

10 to 40 psig / 0.69 to 2.8 bar

14A6770X012 Yellow

16 1.1 4 0.28 40 2.8

30 to 125 psig / 2.1 to 8.6 bar

14A6632X012 Green

20 1.4 6 0.4 125 8.6

85 to 400 psig / 5.9 to 27.6 bar

14A6634X012 Red

55 3.8 16 1.1 400 28

6, 8 x 6 /

150, 200 x 150

10 to 40 psig / 0.69 to 2.8 bar

15A2253X012 Yellow

16 1.1 4 0.28 40 2.8

30 to 125 psig / 2.1 to 8.6 bar

14A9686X012 Green

20 1.4 6 0.4 125 8.6

85 to 400 psig / 5.9 to 27.6 bar

15A2615X012 Red

55 3.8 16 1.1 400 28

1. Minimum differential is dened as the difference between the inlet pressure to the main valve body and the exhaust pressure from the pilot outlet. If the pilot exhaust is piped to the

immediate downstream system, the differential is between the inlet and outlet pressure of the backpressure regulator. The pilot exhaust also may be discharged to atmosphere.

BODY SIZE,

NPS / DN

PIPING STYLE

Line Size Equals Body Size 2:1 Line Size to Body Size

Linear Cage Whisper Trim™ III Cage

Linear Cage Whisper Trim III Cage

2 / 50

3 / 80

2280

4630

63.3

132

36.0

35.1

1970

3760

54.7

107

36.0

35.0

0.71

2050

4410

59.6

128

34.4

1830

3630

52.2

106

35.0

34.2

0.71

4 / 100

6 / 150

8 x 6 / 200 x 150

7320

12,900

17,800

202

397

556

36.2

32.5

32.0

6280

9450

10,500

180

295

300

34.8

32.0

35.0

0.71

6940

12,100

17,100

198

381

534

35.0

31.7

32.0

6020

9240

10,270

171

291

293

35.2

31.7

35.0

0.71

BODY SIZE, NPS / DN X

2 / 50 0.82 0.35 0.84

3 / 80 0.78 0.30 0.84

4 / 100 0.83 0.28 0.84

6 or 8 x 6 / 150 or 200 x 150 0.67 0.28 0.84

Table 5. IEC Sizing Coefcients

1 2 3 4 5 6 7 8

Bulletin 71.4:63EG-98HM 2

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