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Table 4.
Minimum and Maximum Differential 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
(2)
28
(2)
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
(2)
28
(2)
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
(2)
28
(2)
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
(2)
28
(2)
1. Minimum differential is defined 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.
2. CL150 steel body is limited to 290 psig / 20 bar.
WARNING
1.
Call a qualified personnel when installing,
operating, and maintaining relief valves and
backpressure regulators. Before installing,
inspect the main valve, pilot and tubing for any
shipment damage or foreign material that may
have collected during crating and shipment. Make
certain the body interior is clean and the pipelines
are free of foreign material. Apply pipe compound
only to the external pipe threads with an NPT
body, or use suitable line gaskets and good bolting
practices with a flanged body.
2. A Type 63EG-98HM may be installed in any
orientation, as long as flow through the valve
matches the direction of the arrow on the main
valve body.
Type 63EG relief valves vent from the
main valve outlet and from the pilot
exhaust. In hazardous or flammable
gas service, personal injury, death or
property damage may occur due to fire
or explosion or exposure of vented gas
(or liquid) that has accumulated. To
prevent such injury or damage, provide
piping or tubing to vent the gas (or
liquid) to a safe location. The exhaust
piping must be designed and installed to
guard against excessive flow restriction.
This piping must be protected against
condensation or anything else that could
clog it.
For safety during shutdown, vent valves
are required immediately upstream
and downstream of the main valve on a
backpressure or bypass installation.
3. If system operation is necessary during
maintenance or inspection, install isolating and
vent valves as needed.
4. A relief valve must be installed so that the pilot
exhausts properly and in a safe place. Make
sure to keep the pilot spring case vent open to
atmospheric pressure.
5. If the exhaust is to be piped to the main valve
outlet or remotely vented, install obstruction-free
tubing or piping with a minimum number of bends
into the 1/2 NPT pilot exhaust connection.
4
Type 63EG-98HM
