Technical Specifications

ValVueFF Software Interface to FVP
102
GE Energy
To configure this option:
1. Select Define from the Options tab Characterization pick list and click Customize.
2. Select Custom Linearization and the Custom Linearization window (Figure 85)
appears.
3. Select inch or mm for Length Unit Select.
4. Select Simple or Compound:
❑ Simple - The simple lever has the pivot point (the position sensor in the FVP)
mounted a fixed distance (L1) from the valve stem pickup point.
❑ Compound - The compound linkage has Lever L1 attached at one end to the pivot
(the position sensor in the FVP) and at the other end to Link L2. Link L2 connects
Lever L1 to the valve stem pickup point. Most linkages use a linkage with L3 equal
to L1, the second lever arm is vertical when the first lever arm is horizontal. The
correction computation correctly computes the correction curve when L3 is not
equal to L1. However, L3 must be greater than 0, which requires that the valve
stem pickup not be lined up with the pivot and that the pickup be on the same side
of the pivot as the link between the first and seconds lever. A dialog box
(Figure 86) displays the angle that the linkage moves. See Specifications for
allowable angle segments.
Figure 86 Rotation Angle
Most linkages use the compound linkage system.
5. Enter data into:
6. Click OK.
❑ Stroke Length (S) ❑ Lever Arm Length (L1) - distance from the
pivot to the valve stem pickup point.
❑ Valve Position at Horizontal (T)% ❑ Lever Arm 2 Length (L2) - Compound only
❑ Offset length (L3) - the distance from the
pivot to the valve stem pickup (L3). Com-
pound only.
❑ L2 above L1 or L2 below L1 - Compound
only