Emerson 63EG Instruction Manual page 4

Types 63EG and 1098-63EGR
MAIN VALVE
BODY SIZE
SPRING RANGE
In. DN psig
30 to 125
1 25
85 to 400
10 to 40
2 50 30 to 125
85 to 400
10 to 40
3 80 30 to 125
85 to 400
10 to 40
4 100 30 to 125
85 to 400
6, 150,
10 to 40
8 x 6 200 x 150
30 to 125
and and
85 to 400
12 X 6 300 X 150
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.
4
Table 2. Minimum and Maximum Differential Pressures
MAIN VALVE
SPRING PART
NUMBER
bar
2.1 to 8.6 14A9687X012
5.9 to 27.6 14A9679X012
0.69 to 2.8 14A6768X012
2.1 to 8.6 14A6626X012
5.9 to 27.6 14A6628X012
0.69 to 2.8 14A6771X012
2.1 to 8.6 14A6629X012
5.9 to 27.6 14A6631X012
0.69 to 2.8 14A6770X012
2.1 to 8.6 14A6632X012
5.9 to 27.6 14A6634X012
0.69 to 2.8 15A2253X012
2.1 to 8.6 14A9686X012
5.9 to 27.6 15A2615X012
TYPE 63EG
MAIN Minimum
VALVE Differential
SPRING Pressure Differential
COLOR Required
For Full Stroke
psig bar psig
Green 70 4.8 125
Red 150 10.3 400
Yellow 22 1.5 40
Green 30 2.1 125
Red 90 6.2 400
Yellow 19 1.3 40
Green 25 1.7 125
Red 60 4.1 400
Yellow 16 1.1 40
Green 20 1.4 125
Red 55 3.8 400
Yellow 16 1.1 40
Green 20 1.4 125
Red 55 3.8 400
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
TYPE 63EG WITH TYPE 1098
SIZE 40 ACTUATOR
Minimum
Maximum Differential
Pressure
Pressure Required For
Full Stroke
bar psig bar
8.6 2.5 0.17
27.6 - - - - - - - -
2.8 2 0.14
8.6 3 0.21
27.6 - - - - - - - -
2.8 2.5 0.17
8.6 4 0.28
27.6 - - - - - - - -
2.8 3.5 0.24
8.6 5 0.34
27.6 - - - - - - - -
2.8 6 0.41
8.6 9.5 0.66
27.6 - - - - - - - -
Maximum
Differential
Pressure
psig bar
60 4.1
- - - - - - - -
20 1.4
60 4.1
- - - - - - - -
20 1.4
60 4.1
- - - - - - - -
20 1.4
60 4.1
- - - - - - - -
20 1.4
60 4.1
- - - - - - - -