Appendix H. Notes On Characterization; Valve Over/Under Reaction Near Endpoints - GE Baker Hughes Masoneilan SVI FF Installation And Operation Manual

Appendix H. Notes on Characterization

Valve Over/Under Reaction Near Endpoints

This section is intended to explain why at times the valve can appear to be either over-reacting
or under-reacting to the user-based configuration.
A principle point to understand is the difference between the travel domain and the user domain:
The travel domain is what is actually happening to the valve - the amount of movement
during operation. This reflects the state of the working setpoint.
The user domain is reflected in the output seen on the LCD, through a DTM or other
interface. This reflects the value of the FINAL_VALUE parameter.
How do these two relate to each other:
FINAL_VALUE --> Characterization process --> Working Setpoint
Whichever user-selected characterization process occurs (based on valve type), dictates the
behavior that are seen during valve operation. Figure 64 shows the characterizations curves.
© 2019 Baker Hughes, a GE company, LLC. All rights reserved.
Figure 64 Characterization Curves
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