... High pressure. High pressure control valveMainly technical inspection1,Nominal size(mm); 6 ,10 ,15 ,25 ,32 ,40 ,50,65 2,Seat ring diameter3,Rated flow ... coefficient4, Flow characteristic : Linear ,linear ,equal percentage5, Nominal pressure: 22 326, Single pressure :standard signal :20 ... yarn,asbestos yarn with graphite,graphite packing High pressure control valve