Type-57P Butterfly Valves Type-57P 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-57P butterfly valve is well suited for a wide variety of fluid flow applications. Ideal Applications Include: Isolation valves, control valves, chemical processing, water treatment, water features, fountains, aquariums, landfills, swimming pools, power plants, mining, transportation Features & Benefits: 316SS stem with full disc engagement Full seat design eliminates gaskets Seat overtightening prevention Lockout-Tagout lever handle molded padlock provision and 2-molded valve body tag holes Highly visible 0 - 90 degrees position indicator with 19 fine adjustment locking positions ISO 5211 F07 F14 bolt circle on top flange Polypropylene stem retainer Spherical disc design Non-wetted stem and body - Isolated from the media Plasgear operator