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Characteristics for triple offset butterfly valve

Characteristics for triple offset butterfly valve

Characteristics for triple offset butterfly valve

(OP)
is it suppose to be Equal percentage?

Thanks,

RE: Characteristics for triple offset butterfly valve

Offset butterfly valves address butterfly valve seat and stability issues.  The equal percentage characteristic is easily machined into a globe valve plug or cage.  A butterfly is more linear through the middle travel, likely quick opening at the beginning and perhaps the end of travel.  You may be able to characterize a valve with a smart electronic positioner; or cams on a mechanical positioner.  Fisher provides lots of capacity data.  Use the Fisher butterfly valve data and draw some curves.

RE: Characteristics for triple offset butterfly valve

     The curves of triple offset valves usually may be considered about halfway between equal percentage and square root characteristics... resulting in a linear behaviour (and therefore a good rangeability) far from the complete opening and closing positions, i.e. approx. in the 20°÷70° or 20%÷70% range.
 
     For more specific information, of course, refer to the Manufacturer.

Hope this helps,      'NGL   

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