Valve stem finish effect on fugitive emissions

How stem finish affects friction and fugitive emissions with graphite-based control valve packing.

A well designed and efficiently performing control valve can have a significant impact on process profitability, via reduced process costs, ecological factors and safety via fugitive emissions. We have previously reported that whist control valves are perhaps only 5% of a refinery valve population; they are statistically twice as likely to be found leaking in an emission survey, as of course they are continually in operation and thus pose a greater problem than block valves.