How to reduce your process varibility effectively?
The Fisher Control Disk has been designed to:
You can click the following links for more information:
http://www3.emersonprocess.com/videos/CONTENT/BruceQuernemoenControlDisk/player.html
Hi,
Seems like the main thing that is special is the contour and profiel of the disk...
Can I upgrade existing buetterfly valve to Control Disk by simply changing the disk only while retaining the valve body?
In reply to chowyang.neo:
It is technically possible but I would like to recommend no, there are few reasons below:
a. It may cost you more if just chang the disc, lots of design modification might be required to make sure the shaft and pin match the Control-Disk
b. The special contour and profile of the disk is one of the most important reason to get better control performace. But there are also other necessary factors impact the performace. The shaft-disk connection without lost mothing, shaft-actuator connection without lostion mothion and accuracy of the diaphram spring return actuator are all necessary factors to the control-performace.
So the most reliable solution to is to Control-Disk valve assembly with high accuracy actuator and Fisher Digital Valve Controller (DVC6200).
In reply to Jacky:
In a separate post, I shared that independent study showed as much as 40% of process variability is caused by control valves. In the Fisher Control-Disk valve, the cumulative dead band is kept to a minimum (0.5% or less) by using a clamped lever coupled with the single-pivot linkage and splined valve shaft to reduce lost motion between actuator and valve. The improved shaft/disk pinning also acts to minimize backlash. To improve your loop performance, I highly recommend pairing the Fisher Control-Disk with the new compact size Fisher 2052 spring-and-diaphragm actuator and FIELDVUE Digital Valve Controller for overall optimum valve performance.