627 Series
7
Startup and Adjustment
Startup
!
WARNING
To avoid personal injury or property
damage due to explosion or damage to
regulator or downstream components
during startup, release downstream
relieving or pressure-limiting device must be provided
by the user for the Types 627, 627H, 627M, and
627HM regulators if the inlet pressure can exceed the
outlet pressure rating, since these regulators do not
have internal relief.
Types 627R and 627LR regulators provide internal
relief which limits the total outlet pressure buildup over
setpoint. Use Tables 3 and 4 to determine the total
outlet pressure. This internal relief may be adequate
for the application, if not, provide additional pressure
relief or a pressure-limiting device downstream.
Table 3. Type 627R Internal Relief Performance
(1)
- continued -
ouTLET
PRESSuRE RANGE,
SPRING PART
NuMBER, AND
CoLoR CoDE
ouTLET
PRESSuRE
SETTING
MAxIMuM
ALLoWABLE
DoWNSTREAM
SySTEM
PRESSuRE
MAxIMuM INLET PRESSuRE To KEEP MAxIMuM ALLoWABLE DoWNSTREAM
SySTEM PRESSuRE FRoM BEING ExCEEDED
(2)
Orifice Size, Inches / mm
3/32 / 2.4
1/8 / 3.2
3/16 / 4.8
1/4 / 6.4
3/8 / 9.5
1/2 / 13
psig
bar
psig
bar
psig
bar
psig
bar
psig
bar
psig
bar
psig
bar
psig
bar
5
(3)
to 20 psig /
0.34 to 1.4 bar
10B3076X012
Yellow
10
0.69
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
1250
2000
2000
2000
2000
2000
86.2
138
138
138
138
138
740
1500
1900
2000
2000
2000
51.0
103
131
138
138
138
320
620
830
1100
1300
1600
22.1
42.7
57.2
75.8
89.6
110
190
390
480
670
770
960
13.1
26.9
33.1
46.2
53.1
66.2
95
180
220
320
360
450
6.6
12.4
15.2
22.1
24.8
31.0
75
130
160
220
260
320
5.2
9.0
11.0
15.2
17.9
22.1
15
1.0
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
1000
2000
2000
2000
2000
2000
69.0
138
138
138
138
138
620
1400
1900
2000
2000
2000
42.7
96.5
131
138
138
138
260
610
810
1100
1300
1600
17.9
42.1
55.8
75.8
89.6
110
170
370
480
670
770
960
11.7
25.5
33.1
46.2
53.1
66.2
90
170
220
320
360
450
6.2
11.7
15.2
22.1
24.8
31.0
70
130
160
220
260
320
4.8
9.0
11.0
15.2
17.9
22.1
20
1.4
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
850
2000
2000
2000
2000
2000
58.6
138
138
138
138
138
490
1300
1800
2000
2000
2000
33.8
89.6
124
138
138
138
210
600
800
1100
1300
1600
14.5
41.4
55.2
75.8
89.6
110
130
360
480
670
770
960
9.0
24.8
33.1
46.2
53.1
66.2
80
170
220
320
360
450
5.5
11.7
15.2
22.1
24.8
31.0
65
120
160
220
260
320
4.5
8.3
11.0
15.2
17.9
22.1
15 to 40 psig /
1.0 to 2.8 bar
10B3077X012
Green
15
1.0
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
1000
2000
2000
2000
2000
2000
69.0
138
138
138
138
138
380
1300
1800
2000
2000
2000
26.2
89.6
124
138
138
138
210
590
800
1100
1300
1600
14.5
40.7
55.2
75.8
89.6
66.2
130
350
470
640
780
960
9.0
24.1
32.4
44.1
53.8
66.2
80
170
220
320
370
450
5.5
11.7
15.2
22.1
25.5
31.0
65
120
160
220
260
320
4.5
8.3
11.0
15.2
17.9
22.1
20
1.4
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
630
2000
2000
2000
2000
2000
43.4
138
138
138
138
138
200
1200
1700
2000
2000
2000
13.8
82.7
117
138
138
138
150
550
760
1100
1300
1600
10.3
37.9
52.4
75.8
89.6
66.2
100
330
450
630
770
960
6.9
22.8
31.1
43.4
53.1
66.2
70
160
210
320
360
460
4.8
11.0
14.5
22.1
24.8
31.7
65
120
160
220
260
320
4.5
8.3
11.0
15.2
17.9
22.1
30
2.1
100
125
175
200
250
6.9
8.6
12.1
13.8
17.2
2000
2000
2000
2000
2000
138
138
138
138
138
950
1500
2000
2000
2000
65.5
103
138
138
138
450
670
1000
1200
1600
31.1
46.2
69.0
82.7
110
260
400
610
760
970
17.9
27.6
42.1
52.4
66.9
140
190
300
360
460
9.7
13.1
20.7
24.8
31.7
110
150
220
260
320
7.6
10.3
15.2
17.9
22.1
40
2.8
100
125
175
200
250
6.9
8.6
12.1
13.8
17.2
1500
2000
2000
2000
2000
103
138
138
138
138
700
1300
1800
2000
2000
48.3
89.6
124
138
138
330
560
1000
1200
1600
22.8
38.6
69.0
82.7
110
200
340
550
730
970
13.8
23.4
37.9
50.3
66.9
120
180
290
350
460
8.3
12.4
20.0
24.1
31.7
108
140
220
250
320
7.4
9.7
15.2
17.2
22.1
1. The internal relief performance values are obtained by removing the disk assembly.
2. For inlet pressures in excess of 1000 psig / 69.0 bar, refer to the maximum body and disk pressure ratings in the Specifications section.
3. For pressure settings under 10 psig / 0.69 bar, inlet pressure should be limited to approximately 100 psig / 6.9 bar so the setpoint adjustment can be obtained.
- Shaded areas indicate maximum inlet pressures allowed during system malfunction only. Table 1 gives the maximum inlet pressure for normal regulator operation.