Val Controls IHP24-B - Page 17

DHP-UM-020
Val Controls A/S • Limfjordsvej 3 • DK-6715 Esbjerg N • Tel. +45 7547 0600 • Fax +45 7547 0611
vc@valcontrols.com • www.valcontrols.com
Revision: 12
17/38
Custom curve
The positioner offers the user to define his own valve characteristic from the keyboard. This option
makes it possible to use a wide range of valves and still be able to obtain an accurate regulation.
The positioner needs 11 reference points to linearize an arbitrary valve characteristic. Point 0 and
point 10 cannot be entered as they must be (0%, 0%) and (100%, 100%).
Point
Travel %
Flow %
0
0
0
1
66
0
2
72
16
3
78
33
4
83
50
5
89
66
6
94
83
7
100
100
8
100
100
9
100
100
10
100
100
When the points describing the flow curve are keyed in, the valve positioner will linearize the flow
curve.
0
25
50
75
100
0 25 50 75 100
Flow - %
Travel - %