Emerson 63EG - Type 1098-63 EGR Operation

Types 63EG and 1098-63EGR
4
Table 2. Minimum and Maximum Dierential Pressures
BODY SIZE
MAIN VALVE
SPRING RANGE
MAIN VALVE
SPRING PART
NUMBER
MAIN
VALVE
SPRING
COLOR
TYPE 63EG
TYPE 63EG WITH TYPE 1098
SIZE 40 ACTUATOR
Minimum
Di󰀨erential
Pressure
Required
For Full Stroke
Maximum
Di󰀨erential
Pressure
Minimum
Di󰀨erential
Pressure
Required For
Full Stroke
Maximum
Di󰀨erential
Pressure
In. DN psig bar psig bar psig bar psig bar psig bar
1 25
30 to 125
85 to 400
2.1 to 8.6
5.9 to 27.6
14A9687X012
14A9679X012
Green
Red
70
150
4.8
10.3
125
400
8.6
27.6
2.5
- - - -
0.17
- - - -
60
- - - -
4.1
- - - -
2 50
10 to 40
30 to 125
85 to 400
0.69 to 2.8
2.1 to 8.6
5.9 to 27.6
14A6768X012
14A6626X012
14A6628X012
Yellow
Green
Red
22
30
90
1.5
2.1
6.2
40
125
400
2.8
8.6
27.6
2
3
- - - -
0.14
0.21
- - - -
20
60
- - - -
1.4
4.1
- - - -
3 80
10 to 40
30 to 125
85 to 400
0.69 to 2.8
2.1 to 8.6
5.9 to 27.6
14A6771X012
14A6629X012
14A6631X012
Yellow
Green
Red
19
25
60
1.3
1.7
4.1
40
125
400
2.8
8.6
27.6
2.5
4
- - - -
0.17
0.28
- - - -
20
60
- - - -
1.4
4.1
- - - -
4 100
10 to 40
30 to 125
85 to 400
0.69 to 2.8
2.1 to 8.6
5.9 to 27.6
14A6770X012
14A6632X012
14A6634X012
Yellow
Green
Red
16
20
55
1.1
1.4
3.8
40
125
400
2.8
8.6
27.6
3.5
5
- - - -
0.24
0.34
- - - -
20
60
- - - -
1.4
4.1
- - - -
6,
8 x 6
and
12 X 6
150,
200 x 150
and
300 X 150
10 to 40
30 to 125
85 to 400
0.69 to 2.8
2.1 to 8.6
5.9 to 27.6
15A2253X012
14A9686X012
15A2615X012
Yellow
Green
Red
16
20
55
1.1
1.4
3.8
40
125
400
2.8
8.6
27.6
6
9.5
- - - -
0.41
0.66
- - - -
20
60
- - - -
1.4
4.1
- - - -
loading pressure on top of the main valve plug. Force
from the main spring, in addition to pilot loading
pressure, provides downward loading pressure to keep
the main valve plug tightly closed.
When the inlet pressure rises above the set pressure,
the pressure on the pilot diaphragm overcomes the
control spring and opens the valve plug. The pilot then
exhausts the loading pressure from the top of the main
valve plug. The pilot continuously exhausts gas while
inlet pressure is above the set pressure. The inlet
pressure unbalance overcomes the main spring force
and opens the plug.
As the inlet pressure drops below the set pressure,
the pilot control spring closes the pilot valve plug and
the exhaust to atmosphere stops. Force from the main
spring, along with pilot loading pressure, pushes the
plug onto the seat, producing tight shutoff.
Backpressure Regulator
As long as inlet pressure remains below set pressure,
the Type 6358 pilot control spring keeps the pilot valve
plug closed. Inlet pressure bleeds around the upper
portion of the pilot valve plug and then through the
hollow passage of that valve plug to produce loading
pressure on the main valve plug. This loading pressure
along with force from the main spring provides the
pressure to keep the main valve plug tightly closed.
When inlet pressure rises above the set pressure, the
pressure on the pilot diaphragm overcomes the control
spring to close the upper portion of the valve plug and
stroke the valve plug to open the lower port. The pilot
exhausts loading pressure from the top of the main
valve plug. Inlet pressure unbalance overcomes the
main spring force to open the plug.
While the main valve is throttling, the upper port of
the pilot stays closed. The pilot exhausts only when
it repositions the main valve. As inlet pressure drops
below setpoint, the pilot control spring overcomes the
diaphragm force to stroke the valve plug down to close
the lower port and open the upper port. Force from the
main spring, along with pilot loading pressure, builds
up to close the main valve plug.
Type 1098-63EGR Relief Valve
As long as inlet pressure remains below set pressure,
the Type 6358B pilot control spring keeps the pilot
valve plug closed. Inlet pressure bleeding through the
pilot restriction and the hollow passage of the valve
stem loads the stem side of the actuator diaphragm,
balancing the actuator and letting the main valve
spring keep the main valve plug tightly shutoff.
An inlet pressure rise above the set pressure
overcomes the pilot control spring and opens the
pilot valve plug. Loading pressure bleeds out the pilot