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Type-57 Butterfly Valves

Type-57 Butterfly Valves

Type-57 butterfly valves are quarter turn valves with equal percentage type flow characteristics. They provide moderate flow control and therefore can be used for both on/off and modulating service. Good tolerance to suspended solids but not recommended for use with slurries or debris. The Type-57 butterfly valve is well suited for a wide variety of fluid flow applications.

Design Features

  • Flange Stopper - Prevents over-compressing liners due to improper installation
  • Absorption Channel - Never worry about an over-tightened liner causing excessive stem torque
  • Spherical Disc - Gain higher Cv and extended valve life cycle as a result of new disc design
  • Plasgear Plastic Gear Operator - The first industrial, non-metallic gear box - Offers superior corrosion resistance

Ideal Applications Include: Isolation valves, control valves, chemical processing, water treatment, water features, fountains, aquariums, landfills, swimming pools, power plants, mining, transportation


  • Size: Lever: 1-1/2" – 8" Gear: 1-1/2" – 14"
  • Bodies: PVC, PP and PVDF
  • Seats: EPDM, FKM, and Nitrile
  • Seals: Same as seating material
  • Models: Wafer Style, Lug Style
  • Operators: Lever and Gear
  • Discs: PVC, PP, PVDF and CPVC
  • Stems: 403 and 316 stainless steel, Titanium, Hastelloy C® ‡


  • Standard model (1-1/2" – 14") has PVC body and PP disc for superior chemical resistance and elevated temperature capabilities
  • 316/403 stainless steel shaft has full engagement over the entire length of the disc and is a non-wetted part
  • Only solid and abrasion-resistant plastic disc and elastomeric liner are wetted parts
  • ISO bolt circle on top flange–no body or stem modifications required for accessories
  • Stem retainer–PP retainer to prevent stem removal
  • Seat over tightening protection–Molded body stops and seat stress relief area
  • Spherical disc design offers increased Cv, ultimate sealing and high cycle life
  • 18 position throttle plate for lever handle style
  • NSF 61-G Certified
  • ABS Poduct Type Approved for use in Marine and Offshore applications

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