Flowserve Valtek Beta Positioners for Control Valves - Manual (Page 10)

24-10 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
100 90 80 70 60 50 40 30 20 10 0
0 10 20 30 40 50 60 70 80 90 100
90
74
61
50
39
30
23
17
12
7
100
90
80
70
60
50
40
30
20
10
0
Percent Signal (Air-to-Close)
Percent Signal (Air-to-Open)
Percent C
v
(Typical)
Degrees Shaft Rotation
100 90 80 70 60 50 40 30 20 10 0
0 10 20 30 40 50 60 70 80 90 100
90
85
79
72
65
57
48
39
28
15
100
90
80
70
60
50
40
30
20
10
0
Percent Signal (Air-to-Close)
Percent Signal (Air-to-Open)
Percent C
v
(Typical)
Degrees Shaft Rotation
Figure 11: Valdisk – Equal Percent Flow Characteristic
(Shaft Rotation vs. Instrument Signal)
Figure 12: Valdisk – Linear Flow Characteristic
(Shaft Rotation vs. Instrument Signal)