Technical Specifications

ValVue Digital Communications Software Ver. 2.80
232
GE Oil & Gas
Characterization
Use the radio buttons to select the characterization type. 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 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 % (50) and Equal % (30): Two equal percentage characterizations are available,
one with R=50 and the other with R=30.
 Quick Open: The quick opening characterization is the inverse to the Equal Percentage
50% characterization curve.
 Custom: Selecting this option displays the Custom Characterization dialog to format a
custom curve. The curve can have up to nine points and points in between are linearly
interpolated. See “Custom Characterization” on page 233.
 Camflex %: This characterizes the valve as a Masoneilan Camflex valve with settings of
Linear and Equal 50%.
Figure 34 shows the characterization curves in a graphical format.
Figure 34 Characterization Curves