Technical Specifications

ValVue Digital Communications Software Ver. 2.80
102
GE Oil & Gas
Characterization
Control valves are characterized to give a specific relationship between flow capacity (Cv) and
percent opening of the valve. The valve can be characterized with special purpose trim or with
the SVI II AP positioner. Several characterizations are available:
 Linear: Causes the valve to open proportionally with the input signal. Select this option
if non-linear trim is used in the valve.
 Equal Percentage (50) and Equal Percentage (30): Two equal percentage
characterizations are available, one with R=50 and the other with R=30.
 Quick Opening: The quick opening characterization is the inverse to the Equal
Percentage (50) characterization curve.
 Custom Configuration: Selecting this option displays an additional dialog where you
enter or draw a custom characterization curve. The curve can have up to nine points
and points in between are linearly interpolated.
 Camflex: Selecting this option characterizes the valve as if it were a Camflex valve with
settings of Linear and Equal Percentage 50.
Figure 72 shows the characterization curves in a graphical format.
Figure 72 Characterization Curves
Valve Position %
Input Signal %