Additional code for electric butterfly valve: BD thermal insulation butterfly valve, SD telescopic butterfly valve, TLD desulfurization butterfly valve, DH check butterfly valve, DKS fast butterfly valve, FDBD square louver butterfly valve; butterfly valve coding code: D for butterfly valve; transmission form code: manual (omitted), 3 for Turbine transmission, 6 means pneumatic transmission, 7 means hydraulic, 9 means electric; connection code: 4 flange type, 6 welding, 7 pair clamp type; structure code: 1 means centerline type, 2 means double eccentric, 3 Means triple eccentricity, 4 means variable eccentricity, 5 means single eccentricity; seal material code: H stainless steel, X rubber, F polytetrafluoroethylene, FX composite rubber, M Monel alloy, Y cemented carbide, W valve body directly processed; Pressure grade code: 10=PN1.0Mpa, 16=PN1.6, 25=PN2.5, 40=PN4.0, PN is the code of domestic pressure, MPA is the unit of pressure, one kilogram is equal to 0.1Mpa; Class150LB=1.6 mpa, 300LB=2.5-4.0mpa, Class is the American standard code name, LB is the American standard pound unit. Shell material code: C cast steel, P stainless steel 304, R stainless steel 316, AL special alloy steel, Z cast iron, Q ductile iron, N nylon.
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