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If you E mail me i have a small xls to work out stem friction from packing, we used for Russian PWR,s Cheers

Bit late From a UK perspective, we have completed the ISO and 77/312 type testing, in essence you have to be carefull with the mechanical testing, whilst we succeded in meeting the fugitive emission standard such as 1000 cycles, max 50 ppm for a gate valve the limiting factor is the cycles at...

A number of companies try Garlock manufacture FDA approved lip seals for powder duty they seem to work well

Pressure seal bonnet seals can be a variety of materials, graphite looks suitable for your application i think Cefilac a french company manufacture this type of seal