The Type 57LIS butterfly valve from Asahi/America is an industrial quality thermoplastic valve. It 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 the Type 57LIS (the distance between the two existing flanges), are the same as those of the metal valves that the Type 57LIS replaces.
The Type 57LIS is available in 3 to 8 in as a lever-style or with Asahi’s Plasgear gear-operator. 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 Type 57LIS features an ISO 5211 top flange mounting pattern and molded padlock provision for lever handle models. The Type 57LIS can easily be electrically or pneumatically actuated using Asahi/America actuators.
The design features of the Type 57LIS 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.
