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.
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
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