Data Sheet
GX 3--Way Valve and Actuator
Product Bulletin
51.1:GX 3--Way
August 2011
21
Coefficients
Table 14. Fisher GX 3--Way, Side Port Common (SPC) Diverging, Linear
Side Port Common (SPC) Diverging
Linear
Characteristic
Valve
Size
Maximum
Travel
Exit Port
(see
figure 5)
Flow
Coeffi-
cient
Valve Opening—Percent of Total Travel (see figure 6)
F
L
(1)
mm
0
(Plug Down)
10 20 30 40 50 60 70 80 90
100
(Plug Up)
DN25/
NPS 1
19
Right
Cv 16.1 15.0 14.2 13.5 12.6 11.1 9.35 7.21 5.27 2.89 0 0.919
Kv 14.0 13.0 12.3 11.7 10.9 9.56 8.09 6.23 4.56 2.50 0 -- -- --
Xt 0.615 0.543 0.427 0.308 0.250 0.226 0.203 0.148 0.119 0.097 0 -- -- --
Bottom
Cv 0 0.897 2.43 4.29 6.06 7.81 9.78 11.6 13.3 15.0 15.6 0.951
Kv 0 0.776 2.10 3.71 5.25 6.75 8.46 10.0 11.5 13.0 13.5 -- -- --
Xt 0 0.899 0.687 0.654 0.698 0.673 0.622 0.700 0.706 0.702 0.758 -- -- --
DN40/
NPS
1--1/2
19
Right
Cv 25.4 22.4 20.5 17.7 15.8 14.2 11.9 9.27 6.93 4.09 0 0.991
Kv 22.0 19.4 17.7 15.3 13.7 12.3 10.3 8.01 6.00 3.54 0 -- -- --
Xt 0.831 0.882 0.741 0.697 0.565 0.501 0.450 0.389 0.341 0.285 0 -- -- --
Bottom
Cv 0 2.33 4.45 7.45 10.6 13.6 16.9 19.2 21.7 23.4 26.6 0.877
Kv 0 2.01 3.84 6.45 9.18 11.8 14.6 16.6 18.8 20.2 23.0 -- -- --
Xt 0 0.245 0.636 0.722 0.723 0.720 0.655 0.685 0.705 0.843 0.803 -- -- --
DN50/
NPS 2
19
Right
Cv 43.9 40.2 35.8 31.1 26.5 23.1 18.7 15.1 11.1 6.78 0 0.973
Kv 38.0 34.7 30.9 26.9 22.9 20.0 16.2 13.1 9.63 5.87 0 -- -- --
Xt 0.864 0.817 0.767 0.656 0.598 0.533 0.536 0.429 0.333 0.215 0 -- -- --
Bottom
Cv 0 2.66 7.61 13.2 18.1 23.5 29.3 34.9 41.6 48.1 52.2 0.831
Kv 0 2.30 6.58 11.4 15.6 20.3 25.4 30.2 36.0 41.6 45.1 -- -- --
Xt 0 0.614 0.651 0.649 0.651 0.627 0.609 0.599 0.588 0.600 0.640 -- -- --
DN80/
NPS 3
38
Right
Cv 92.8 85.2 70.3 57.6 47.5 39.2 31.6 25.1 19.7 13.8 0 1.000
Kv 80.3 73.7 60.8 49.8 41.1 33.9 27.3 21.8 17.0 11.9 0 -- -- --
Xt 0.858 0.989 0.976 0.934 0.896 0.864 0.789 0.682 0.540 0.306 0 -- -- --
Bottom
Cv 0 9.03 20.4 30.3 41.0 52.1 60.1 69.1 79.4 90.6 101.9 0.839
Kv 0 7.81 17.7 26.2 35.4 45.1 52.0 59.8 68.7 78.3 88.1 -- -- --
Xt 0 0.557 0.695 0.814 0.795 0.790 0.876 0.929 0.937 0.932 0.855 -- -- --
DN100/
NPS 4
38
Right
Cv 145.4 137.4 119.9 100.6 81.6 68.3 57.6 45.5 33.9 21.1 0 0.942
Kv 125.8 118.9 103.7 87.0 70.6 59.1 49.9 39.4 29.3 18.2 0 -- -- --
Xt 0.984 0.956 0.975 0.828 0.817 0.810 0.705 0.601 0.475 0.322 0 -- -- --
Bottom
Cv 0 15.0 37.7 58.7 79.9 99.3 122.3 143.7 166.0 189.3 216.4 0.818
Kv 0 13.0 32.6 50.8 69.1 85.9 105.8 124.3 143.6 163.8 187.2 -- -- --
Xt 0 0.587 0.659 0.764 0.798 0.840 0.887 0.880 0.869 0.810 0.640 -- -- --
1. At maximum flow.