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Center line butterfly valve according to the seat material into rubber lining center line butterfly valve and  fluorine plastic lining butterfly valve, rubber lining center line butterfly valve mainly for  cast iron valve body lining EPDM, NBR, VITON  rubber and so on rubber, mainly used for water, serous situation, often used in medium with fresh water, sea water, sewage etc.PTFE lined butterfly valve(Teflon lined butterfly valve) is mainly in WCB body lining PTFE, F46, and other plastics, mainly used in chemical anti-corrosion, often used in corrosive liquids such as nitric acid and sulfuric acid.
Design Feature
  • Concentric design
  • Non Pin stem
  • Low torque
  • Zero leakage
  • Low torque
  • Self cleaning
  • Blowout-proof stem
  • ISO 5211 top flange
Design Standard
  • Design: API 609
  • Face to face: ISO5752-20 / ISO5752-13
  • End connection: ASME B16.5 / ASME B16.47 /EN1092-2
  • Test: API598
Technical Specification
  • Size: 2”~80”(DN50~DN2000)
  • Class: 150Lb(PN10,PN16)
  • Connection: Double flange / U-Type Flange / Wafer / Lug
  • Operation: Manual / Worm Gear / Pneumatic actuator / Electric actuator
  • Temperature: -20°C to +160°C
  • Application: Sewage treatment / Desalination of sea water / Chemical / Corrosion media
Material Option
  • Body: Cast iron / Ductile iron / WCB
  • Disc: Stainless steel(CF8,CF8M,CF3,CF3M) / 
    Duplex stainless steel(4A,5A,6A) / 
    Hastelloy alloy(N-12MV,CW-12MW,CW-2M) / 
    Inconel alloy(CY-40,CW-6MC) / 
    Monel alloy(M35-1) / 
    Aluminium bronze alloy(C95400,C95500,C95800,AB2C)
  • Stem: SS420 / 17-4PH / F304 / F316 / K500
  • Seat: EPDM / NBR / Viton
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