Flowserve Logix MD+ ValveSight - Manual (Page 150)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
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for checking for abnormal dynamic error in the system. Note that the test duration can
dramatically affect the dynamic error if the test has been set-up to stroke too quickly for a
particular actuator size.
View Friction/Thrust
This graph shows the friction in the valve based on the pressures measured during the
signature test. This friction is independent of the friction calculation that is shown in the
valve health screen. The friction values will change based on the speed of the ramp test
because of pressure latency in the air lines. Slower ramp tests will provide more consistent
friction values. Note that, for this graph to be accurate, the proper actuator size must have
been entered in the
Actuator information page.