GE MN-ValVue-v2-8-IOM Manuale di Servizio Scaricare il pdf (Pagina 232)

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101

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

1 2 ... 227 228 229 230 231 232 233 234 235 236 237 ... 659 660

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GE MN-ValVue-v2-8-IOM Manuale di Servizio Pagina 232

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