627 Series
9
pressure to prevent an overpressure
condition on the diaphragm of
the regulator.
In order to avoid an overpressure
condition and possible equipment
damage, pressure gauges should
always be used to monitor pressures
during startup.
1. Slowly open the upstream shut-off valve.
2. Slowly open the downstream shut-off valve.
3. Check all connections for leaks.
4.
Make final control spring adjustments
according to the adjustment procedures.
Adjustment
The range of allowable pressure settings is marked on
the nameplate. If a pressure setting beyond this range
is necessary, substitute the appropriate regulator
control spring. Change the nameplate to indicate the
new pressure range.
Before increasing the setting, refer to Table 1, 2, 3, or 4.
Review the pressure limits for the control spring range
being used and be certain that the new pressure setting
will not result in an overpressure condition.
Note
Always use a pressure gauge to monitor
pressure when making adjustments.
KEy NuMBER
(1)
DESCRIPTIoN
MAxIMuM ToRquE
FooT-PouNDS
N•
m
2
Orifice
25
34
3
Cap screw (with aluminum diaphragm casing)
16
22
Cap screw (with ductile iron or steel/stainless steel diaphragm casing)
25
34
18
Lever cap screw
7
9.5
22
Diaphragm connector nut
17
23
26
Guide retainer (for Types 627R, 627LR, and 627MR only)
3
4.1
37
Spring case cap screw (with aluminum or ductile iron diaphragm casing)
7
9.5
Spring case cap screw (with steel/stainless steel diaphragm casing)
35
47
46
Diaphragm cap screw (with Type 627 or 627M)
7
9.5
Diaphragm cap screw (with Type 627H or 627HM)
14
19
1. Refer to Figures 7 through 13 for key number locations.
Table 7. Maximum Torque Values
Table 5.
Flow Coefficients
oRIFICE
3/4 NPT
NPS 1 / DN 25 BoDy
NPS 2 / DN 50 BoDy
Inch
mm
Wide-open
C
g
for
External
Relief Sizing
Wide-open
C
v
for
External
Relief Sizing
C
1
Wide-open
C
g
for
External
Relief Sizing
Wide-open
C
v
for
External
Relief Sizing
C
1
Wide-open
C
g
for
External
Relief Sizing
Wide-open
C
v
for
External
Relief Sizing
C
1
3/32
2.4
6.9
0.24
29.2
6.9
0.24
28.5
6.9
0.23
29.7
1/8
3.2
12.5
0.43
29.1
12.5
0.43
29.4
12.5
0.42
29.5
3/16
4.8
29
1.01
28.6
29
0.93
31.2
29
1.02
28.5
1/4
6.4
50
1.63
30.6
50
1.71
29.3
52
1.66
31.3
3/8
9.5
108
2.99
36.1
108
3.42
31.6
115
3.39
33.9
1/2
13
190
4.87
39.0
190
5.29
35.9
200
5.01
39.9
oRIFICE SIzE
x
T
F
D
F
L
Inch
mm
3/4 NPT Body
NPS 1 / DN 25 Body
NPS 2 / DN 50 Body
3/32
2.4
0.539
0.514
0.558
0.50
0.85
1/8
3.2
0.536
0.547
0.539
0.79
3/16
4.8
0.517
0.616
0.514
0.85
1/4
6.4
0.592
0.543
0.620
0.87
3/8
9.5
0.824
0.632
0.727
0.89
1/2
13
0.962
0.815
1.01
0.86
Table 6.
IEC Sizing Coefficients