Asahi/America”s Type 57LIS thermoplastic butterfly valve is designed to serve as an easy direct replacement of metallic butterfly valves and conforms to ISO-5752 short face-to-face dimensions. The butterfly valve is an industrial quality thermoplastic valve that directly replaces metallic butterfly valves, without any modification to the existing piping system, in applications where metal valves constantly corrode. The face-to-face dimensions of this valve (the distance between the two existing flanges), are the same as those of the metal valves that it would replace. The valve is available in three inches to eight inches as a lever-style or with Asahi’s Plasgear gear-operator, the industry’s first all-plastic housing design. Standard models are supplied as wafer-style for installation between two flanges or factory equipped with 316 stainless steel lugs for end-of-line applications. The valve features an ISO 5211 top flange mounting pattern and molded padlock provision for lever handle models. The valve can easily be electrically or pneumatically actuated using Asahi/America actuators. The design features are identical to those of Asahi/America’s Type 57 and Type 57L butterfly valves. Molded body stops on the valve body make it impossible to over-tighten the mating flanges upon installation. A molded flow-direction arrow on the valve body indicates fluid flow through the valve. A full seat design liner meeting class six bubble-tight shut-off requirements completely encapsulates and isolates the valve body and 316 SS stem from the process media. The valve’s spherically designed disc improves flow characteristics and increases CV values while extending the cycle life of the valve.