GE MN-ValVue-v2-8-IOM Manuel de service Page 632

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ValVue Digital Communications Software Ver. 2.80
632
GE Oil & Gas
Custom
Linearization
When mounted on a reciprocating valve, a small
non-linearity
in the
reported valve
position
versus actual valve position may result
fro
m
the
linkage
configuration.
This non-linearity can
be corrected using a custom characterization that matches the specific linkage used.
The
custom
linearization
procedure
automatically
generates
this custom characterization.
Custom characterization must be the selected configuration option to use the generated
curve.
This option is selected automatically when you click OK to accept the displayed curve.
Two types of linkages are modeled: simple and compound. Most Masoneilan linkages use the
compound linkage system.
Clicking Cancel on the
Custom Linearization
tab returns
to the
Configuration
tab without
changing
the characterization.
Figure 7 Custom Linearization
Linkage
Parameters
Stroke Length - The distance of stem movement from 0% to 100% position.
Lever 1 Length - The length of the lever connected to the rotating element of the SVI2.
Position at horizontal - The valve position when Lever 1 is horizontal (for normally
positioned valves).
Lever 2 Length - The length of the 2nd lever in a compound lever. This lever connects
the 1st lever to the valve stem.
Offset - The horizontal distance from the connection between the two levers and the
connection of the 2nd lever to the stem.
Lever 2 Above/Below - Select above if Lever 2 points toward the open position and
below if it points toward the closed position.
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