Emerson 63EG-98HM Datasheet download pdf (Page 4)

Bulletin 71.4:63EG-98HM

MAIN VALVE BODY SIZE

END CONNECTION STYLE

NPS DN

2 50

NPT, ASME CL150 RF, CL300 RF,

CL600 RF or PN 16/25/40 anged

3, 4, 6 80, 100, 150

ASME CL150 RF, CL300 RF,

CL600 RF or PN 16/25/40 anged

8 x 6 200 x 150

ASME CL150 RF, CL300 RF

and CL600 RF anged

Table 1. Body Sizes and End Connection Styles

BODY SIZE PORT DIAMETER VALVE PLUG TRAVEL

NPS DN In. mm In. mm

2 50 2-3/8 60 1-1/8 29

3 80 3-3/8 86 1-1/2 38

4 100 4-3/8 111 2 51

6 150 7-3/16 183 2 51

8 x 6 200 x 150 7-3/16 183 2 51

Table 2. Port Diameters and Valve Plug Travels

Table 3. Relief Set Pressure or Backpressure Control Ranges

CONTROL PRESSURE RANGE

(1)

PART NUMBER COLOR

SPRING FREE LENGTH SPRING WIRE DIAMETER

psig bar In. mm In. mm

15 to 35 1.0 to 2.4 ERCA04288A0 Yellow 2.50 63.5 0.207 5.26

25 to 75 1.7 to 5.2 ERAA01910A0 Green 2.595 65.9 0.234 5.94

70 to 140 4.8 to 9.7 ERAA01911A0 Red 2.44 62.0 0.283 7.19

130 to 200 9.0 to 13.8 ERAA02889A0 Blue 2.250 57.2 0.331 8.41

150 to 375

(2)

10.3 to 25.9

(2)

1N943427142 Unpainted 5.063 129 0.394 10.0

1. All springs may be backed off to 0 psig / 0 bar. However, highest capacities and best performances are obtained by using these springs in their recommended ranges.

2. 150 to 375 psig / 10.3 to 25.9 bar spring range is for the Type MR98HH pilot construction.

However, the next consideration is making sure there is

enough differential pressure between P

and P

to fully open

the main valve. This minimum differential is determined by

the valve plug area and the main valve spring. The smaller

the valve plug area (i.e. body size) and the heavier the spring

rate (i.e. red spring), the larger the differential requirements.

In Table 5 the yellow main valve spring for NPS 2 / DN 50

body requires a differential pressure of 22 psi / 1.5 bar to fully

open the main valve. Since it was calculated that 17 psi /

1.2 bar differential pressure is available to open the main

valve, the minimum differential pressure can be subtracted

from the calculated available differential pressure. In this

case that would be 22 – 17 = 5 psig / 1.5 – 1.2 = 0.34 bar.

Therefore, the inlet pressure would build-up an additional

5 psig / 0.34 bar in order to fully open the main valve. This

will bring the inlet pressure to a total of 37 psig / 2.6 bar,

32 + 5 = 37 psig / 2.2 + 0.35 = 2.6 bar.

If the pilot were exhausting to atmosphere, the available

differential pressure would be calculated at 25 psig / 1.7 bar

setpoint + 7 psi / 0.48 bar build-up required less the pilot

exhaust pressure 0 psig / 0 bar. After calculating the available

differential pressure of 32 – 0 = 32 psig / 2.2 – 0 = 2.2 bar

– P

). With the minimum differential required to open the

main valve at 22 psi / 1.5 bar, there is enough differential

pressure to open the main valve without further build-up.

The C

can be recalculated using the formula below based on

the higher differential pressure between the inlet and outlet of

the main valve. With a 32 psig / 2.2 bar inlet and a 10 psig /

0.69 bar outlet pressure, the required C

of 38.3 is less than

that based upon our original 10 psi / 0.69 bar differential

pressure. This might be helpful in determining regulator size

with near capacity limits.

= Q

Water and Steam Backpressure Relief

In water and steam applications, a Stainless steel body

ange (bonnet) and cage ensure that the valve plug will travel

on a corrosion-free surface. The cage supplied in standard

Stainless steel constructions is a Whisper Trim™ Cage style.

Please note ow coefcients for capacity information.

Application Guidelines

For high cycling applications and/or fast on and off loads,

such as solenoid valves and temperatures of 300°F / 149°C

or less, Fluorocarbon (FKM) diaphragms are recommended.

A PTFE protector comes standard with Fluorocarbon (FKM)

diaphragms to prevent chemical attack.

If the application is above 300°F / 149°C and high

cycling and/or fast on and off loads occur, a needle valve

can be installed on the sense line to buffer the load on

the diaphragm.

For high viscosity uids, the manufacturer will supply a

needle valve that can be used to replace the xed restriction

which allows the regulator gain to be adjusted. The build-up

may vary from those shown in Table 5. The xed restriction

maintains the proportional gain of the regulator to the

published values relating to build-up.

1 2 3 4 5 6 7 8

Bulletin 71.4:63EG-98HM 2

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Emerson 63EG-98HM Datasheet Page 4

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