Data Sheet
GX 3--Way Valve and Actuator
Product Bulletin
51.1:GX 3--Way
August 2011
22
Table 15. Fisher GX 3--Way, Side Port Common (SPC) Converging, Linear
Side Port Common (SPC) Converging
Linear
Characteristic
Valve
Size
Maximum
Travel
Inlet Port
(see
figure 7)
Flow
Coeffi-
cient
Valve Opening—Percent of Total Travel (see figure 8)
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 15.9 13.2 10.7 9.30 7.54 6.31 4.65 3.64 2.04 1.04 0 0.978
Kv 13.7 11.4 9.28 8.04 6.52 5.46 4.02 3.15 1.77 0.898 0 -- -- --
Xt 0.658 0.866 0.758 0.657 0.723 0.669 0.739 0.728 0.909 0.898 0 -- -- --
Bottom
Cv 0 0.562 1.72 3.28 4.90 6.51 8.74 10.3 12.9 14.3 16.3 0.949
Kv 0 0.486 1.49 2.84 4.24 5.63 7.56 8.89 11.1 12.4 14.1 -- -- --
Xt 0 0.397 1.005 0.966 0.847 0.767 0.675 0.659 0.605 0.662 0.663 -- -- --
DN40/
NPS
1--1/2
19
Right
Cv 29.3 26.7 23.0 17.1 14.6 11.9 9.47 7.07 4.78 2.34 0 0.999
Kv 25.3 23.1 19.9 14.8 12.6 10.3 8.19 6.12 4.13 2.03 0 -- -- --
Xt 0.821 0.714 0.711 0.857 0.806 0.900 0.907 0.803 0.842 0.660 0 -- -- --
Bottom
Cv 0 0.881 3.02 6.46 8.83 11.7 15.9 18.3 20.9 24.3 28.4 0.978
Kv 0 0.762 2.61 5.58 7.64 10.1 13.7 15.8 18.1 21.1 24.5 -- -- --
Xt 0 -- -- -- 0.994 0.779 0.865 0.832 0.679 0.745 0.752 0.785 0.749 -- -- --
DN50/
NPS 2
19
Right
Cv 54.6 48.5 42.2 35.2 28.5 22.9 18.0 12.4 7.44 3.02 0 0.932
Kv 47.2 42.0 36.5 30.4 24.6 19.8 15.6 10.7 6.43 2.61 0 -- -- --
Xt 0.626 0.636 0.596 0.559 0.574 0.605 0.617 0.685 0.798 0.949 0 -- -- --
Bottom
Cv 0 2.05 6.44 11.0 15.8 20.9 25.6 32.2 41.6 47.6 52.0 0.958
Kv 0 1.78 5.57 9.50 13.7 18.1 22.2 27.9 36.0 41.2 45.0 -- -- --
Xt 0 0.888 0.919 0.958 0.895 0.844 0.859 0.804 0.735 0.745 0.785 -- -- --
DN80/
NPS 3
38
Right
Cv 111.9 101.0 87.8 72.7 59.2 48.3 38.5 28.5 18.9 9.87 0 1.000
Kv 96.8 87.4 75.9 62.9 51.2 41.8 33.3 24.7 16.4 8.53 0 -- -- --
Xt 0.811 0.757 0.669 0.704 0.755 0.765 0.745 0.723 0.725 0.716 0 -- -- --
Bottom
Cv 0 6.84 16.1 26.4 40.0 55.0 70.4 85.7 100.8 113.1 127.8 0.965
Kv 0 5.91 13.9 22.8 34.6 47.6 60.9 74.1 87.2 97.8 110.6 -- -- --
Xt 0 0.989 0.967 0.994 0.876 0.800 0.773 0.759 0.752 0.767 0.752 -- -- --
DN100/
NPS 4
38
Right
Cv 163.4 153.0 137.0 115.0 92.0 74.0 57.8 43.5 28.3 12.8 0 0.869
Kv 141.4 132.3 118.5 99.4 79.6 64.0 50.0 37.7 24.5 11.1 0 -- -- --
Xt 0.688 0.634 0.558 0.558 0.603 0.610 0.595 0.578 0.573 0.525 0 -- -- --
Bottom
Cv 0 12.9 30.1 46.6 66.3 88.4 112.4 135.9 161.4 185.2 212.2 0.816
Kv 0 11.2 26.0 40.3 57.3 76.4 97.2 117.5 139.7 160.2 183.6 -- -- --
Xt 0 0.920 0.949 0.826 0.789 0.737 0.683 0.660 0.625 0.629 0.589 -- -- --
1. At maximum flow.