... coefficien,long life. expansion graphite stuffing ring, flexible graphite packing ring, graphite ring, pure graphitering, expanded graphite packing ring, packing ring, molded packing ring, a sealing packing ring, above the fillers ... , valve packing seal. ( boiler feed water pumps, heat pumps and high pressure steam valve )Applicable industry: petrochemical, metallurgy, electric power, nuclear ...