Types 63EG and 1098-63EGR
3
Product Description
Types 63EG and 1098-63EGR pilot-operated pressure
relief valves may be used for both liquid and gas
service. The Type 63EG is also suitable for throttling
backpressure or bypass applications. The main valves
in both constructions use a quick-change trim package
for fast maintenance.
Pilot Descriptions
The following pilot configurations are available
for the Type 63EG or 1098-63EGR relief valve or
backpressure regulator.
Relief Valve
For relief valve application use a Type 6358B, 6358EB
or 6358EBH relief pilot. The pilot bleeds constantly
while the relief valve is in operation. The pilot does
not bleed when inlet pressure is below set pressure.
The pilot exhaust can be connected directly to the
main valve exhaust pipe if the pilot connection and
the exhaust pipe are designed to prevent significant
backpressure buildup during full-flow conditions.
Type 6358B—
Set pressure range from 10 to
125 psig / 0.69 to 8.62 bar in two ranges. This pilot is
available with a high, medium or low-gain restriction.
Type 6358EB—
Set pressure range of 85 to 350 psig /
5.86 to 24.1 bar in three ranges. This pilot is available
with a high or low-gain restriction.
Type 6358EBH—
Set pressure range of 250 to
400 psig / 17.2 to 27.6 bar in two ranges. This pilot is
available with a high or low-gain restriction.
Backpressure Regulator
The
Type 6358
is a low bleed pilot, so it only exhausts
while it is repositioning the main valve. There is no
constant bleed with this construction which is useful for
backpressure applications where minimizing emissions
is important and the pilot exhaust can not be piped
to the downstream piping. This also minimizes dirt
buildup in the pilot. The Type 6358 has a set pressure
range of 10 to 125 psig / 0.69 to 8.62 bar in two
ranges. The Types 6358B, 6358EB and 6358EBH
relief pilots can also be used in backpressure
applications but they will exhaust any time inlet
pressure is above setpoint.
Principle of Operation
A pressure relief valve is a throttling pressure control
device that opens and closes to ensure the upstream
pressure does not rise above a predetermined
pressure. A backpressure regulator is a device that
controls and responds to changes in the upstream
pressure. It functions the same as a relief valve in that
it opens on increasing upstream pressure.
The Types 63EG and 1098-63EGR relief valves are
not ASME safety relief valves.
Type 63EG
Relief Valve
As long as the inlet pressure is below the set pressure,
the Type 6358B, 6358EB or 6358EBH pilot control
spring keeps the pilot valve plug closed. Inlet pressure
passes through the pilot restriction and through the
hollow passage of the valve plug then registers as
TYPE
PILOT TYPE
RELIEF SET
PRESSURE RANGE
(1)
SPRING PART
NUMBER
SPRING
COLOR
SPRING WIRE
DIAMETER
SPRING FREE
LENGTH
psig
bar
In.
mm
In.
mm
63EG
6358
10 to 40
35 to 125
0.69 to 2.8
2.4 to 8.6
1E392527022
1K748527202
Yellow
Red
0.148
0.187
3.76
4.75
2.00
2.19
50.8
55.6
6358B
10 to 30
30 to 60
60 to 125
0.69 to 2.1
2.1 to 4.1
4.1 to 8.6
1B788327022
1B788427022
1K748527202
Silver
Blue
Red
0.142
0.182
0.187
3.61
4.62
4.75
2.13
1.94
2.19
54.1
49.3
55.6
6358EB
85 to 140
130 to 200
180 to 350
5.9 to 9.6
9.0 to 13.8
12.4 to 24.1
17B1261X012
17B1263X012
17B1264X012
Green
Blue
Red
0.225
0.262
0.294
5.72
6.65
7.47
3.70
3.85
4.22
94.0
97.8
107
6358EBH
250 to 400
17.2 to 27.6
17B1263X012
Blue
0.262
6.65
3.85
97.8
1098-63EGR
6358B
3 to 18
15 to 40
35 to 65
0.21 to 1.2
1.0 to 2.8
2.4 to 4.5
1B986027212
1E392527022
1K748527202
Green
Yellow
Red
0.120
0.148
0.187
3.05
3.76
4.75
2.12
2.00
2.19
53.8
50.8
55.6
1. Set pressure plus buildup should not exceed maximum differential pressure of 400 psig / 27.6 bar.
Table 1.
Relief Set Pressure and Backpressure Control Ranges
