Data Sheet

Bulletin 71.1:627W
9
Table 7. C
v
Coefcients
(1)
for the Type 627WH Regulator with or without a downstream control line
OUTLET PRESSURE
RANGE AND CONTROL
SPRING (COLOR)
OUTLET PRESSURE
SETTING
INLET
PRESSURE
NPS 3/4 BODY NPS 1 (DN 25) BODY NPS 2 (DN 50) BODY
Psig bar Psig bar
1/4-Inch
(6,3 mm)
Orice
1/2-Inch
(13 mm)
Orice
1/4-Inch
(6,3 mm)
Orice
1/2-Inch
(13 mm)
Orice
1/4-Inch
(6,3 mm)
Orice
1/2-Inch
(13 mm)
Orice
140 to 250 psig
(9,6 to 17,2 bar)
10B3078X012 (blue)
150 10,3
200
250
300
400
500
550
13,8
17,2
20,7
27,6
34,5
37,9
1.17
1.20
1.25
1.20
1.17
1.17
2.83
2.71
2.51
2.01
- - - -
- - - -
1.20
1.24
1.30
1.27
1.23
1.23
2.83
2.71
2.51
2.01
- - - -
- - - -
1.26
1.24
1.30
1.27
1.23
1.23
2.83
2.71
2.51
2.01
- - - -
- - - -
200 13,8
250
300
400
500
600
17,2
20,7
27,6
34,5
41,4
1.26
1.30
1.25
1.22
1.22
3.14
3.05
2.80
- - - -
- - - -
1.30
1.34
1.27
1.27
1.27
3.14
3.05
2.80
- - - -
- - - -
1.34
1.34
1.27
1.27
1.27
3.14
3.05
2.80
- - - -
- - - -
250 17,2
300
400
500
650
20,7
27,6
34,5
44,8
1.27
1.27
1.27
1.27
3.46
3.25
2.92
- - - -
1.27
1.27
1.27
1.27
5.10
3.68
3.33
- - - -
1.32
1.28
1.28
1.28
5.10
3.68
3.33
- - - -
240 to 500 psig
(16,5 to 34,5 bar)
10B3079X012 (red)
250 17,2
300
400
500
650
20,7
27,6
34,5
44,8
1.00
1.07
1.02
1.02
2.46
2.15
2.08
- - - -
1.03
1.10
1.02
1.02
2.52
2.23
2.17
- - - -
1.03
1.10
1.02
1.02
2.52
2.23
2.17
- - - -
300 20,7
350
400
500
700
24,1
27,6
34,5
48,3
1.17
1.22
1.27
1.27
2.63
2.45
2.33
- - - -
1.18
1.25
1.27
1.27
2.69
2.52
2.45
- - - -
1.18
1.25
1.27
1.27
2.69
2.52
2.45
- - - -
400 27,6
450
500
750
800
31,0
34,5
51,7
55,2
1.27
1.38
1.28
1.28
3.16
3.02
- - - -
- - - -
1.29
1.40
1.28
1.28
3.23
3.10
- - - -
- - - -
1.29
1.40
1.28
1.28
3.23
3.10
- - - -
- - -
500 34,5
550
600
750
900
37,9
41,4
51,7
62,1
1.40
1.36
1.34
1.34
3.57
3.51
3.50
- - - -
1.42
1.38
1.38
1.38
3.64
3.60
3.50
- - - -
1.42
1.38
1.38
1.38
3.64
3.60
3.50
- - - -
1. C
v
Coefcients based on a 20% proportional band.
Table 8. Flow and Sizing Coefcients
BODY SIZE,
NPS (DN)
ORIFICE SIZE, INCHES (mm)
Wide-Open C
V
For Relief Sizing K
m
IEC Sizing Coefcients
1/4 (6,3) 1/2 (13) 1/4 (6,3) 1/2 (13)
X
T
F
D
F
L
1/4 (6,3) 1/2 (13) 1/4 (6,3) 1/2 (13) 1/4 (6,3) 1/2 (13)
3/4 1.63 4.87
0.76 0.74
0.592 0.962
0.50 0.50 0.87 0.86
1 (25) 1.70 5.29 0.543 0.815
2 (50) 1.66 5.01 0.620 1.01