Data Sheet

GX Control Valve and Actuator
D103171X012
Product Bulletin
51.1:GX
March 2012
27
Coefficients
Table 24. Fisher GX, Equal Percentage Valve Plug, Flow Up Through the Port
Equal Percentage - Flow Up
Equal Percentage
Characteristic
Valve
Size
Port
Diameter
Maximum
Travel
Flow
Coeffi-
cient
Valve Opening–Percent of Total Travel
F
L
(1)
mm mm 10 20 30 40 50 60 70 80 90 100
DN 15
(NPS
1/2)
9.5 20
C
v
0.118 0.191 0.309 0.457 0.607 0.941 1.39 2.00 2.77 3.34 0.98
K
v
0.102 0.166 0.267 0.396 0.525 0.814 1.20 1.73 2.40 2.89 ---
X
T
0.67 0.59 0.58 0.56 0.57 0.55 0.57 0.57 0.61 0.69 ---
F
d
0.11 0.13 0.16 0.19 0.22 0.28 0.34 0.44 0.58 0.80 ---
9.5
(2)
20
C
v
0.089 0.109 0.153 0.213 0.289 0.393 0.552 0.754 1.03 1.43 0.99
K
v
0.077 0.094 0.132 0.185 0.250 0.340 0.478 0.652 0.891 1.24 ---
X
T
0.72 0.65 0.61 0.59 0.57 0.54 0.53 0.55 0.55 0.59 ---
F
d
0.09 0.09 0.09 0.11 0.13 0.14 0.20 0.24 0.28 0.35 ---
DN 20
(NPS
3/4)
14 20
C
v
0.154 0.192 0.311 0.505 0.763 1.18 1.91 3.05 4.93 6.41 0.98
K
v
0.133 0.166 0.269 0.437 0.660 1.02 1.65 2.64 4.27 5.55 ---
X
T
0.62 0.60 0.58 0.59 0.52 0.54 0.54 0.62 0.71 0.77 ---
F
d
0.08 0.08 0.10 0.13 0.16 0.20 0.26 0.33 0.47 0.59 ---
9.5 20
C
v
0.128 0.206 0.325 0.479 0.629 0.984 1.46 2.14 3.06 3.75 0.95
K
v
0.111 0.178 0.281 0.415 0.544 0.851 1.27 1.85 2.65 3.25 ---
X
T
0.65 0.66 0.62 0.61 0.62 0.65 0.64 0.63 0.65 0.62 ---
F
d
0.11 0.13 0.16 0.19 0.22 0.28 0.34 0.44 0.58 0.80 ---
9.5
(2)
20
C
v
0.127 0.149 0.176 0.222 0.311 0.440 0.599 0.828 1.14 1.65 0.97
K
v
0.110 0.129 0.153 0.192 0.269 0.381 0.518 0.716 0.985 1.43 ---
X
T
0.69 0.77 0.68 0.81 0.76 0.71 0.72 0.67 0.75 0.79 ---
F
d
0.09 0.09 0.09 0.11 0.13 0.14 0.20 0.24 0.28 0.35 ---
1. At 100% travel.
2. Restricted trim.
3. Balanced trim.
4. Balanced, restricted trim.
-continued-