New design features of the Type 57 butterfly valve include a flange stopper, which prevents overcompression in the valve liner, and a molded body absorption channel. These features work together to eliminate seat compression from effective stem torque, resulting in higher cycle life. A spherical disc provides increased flow characteristics and is less intrusive to piping systems. And, the valve is produced with the first all-plastic gear operator, Plasgear, which is standard on 8-in. through 14-in. models and an option on other sizes. Made of polyvinyl chloride (PVC), polypropylene or polyvinylidene fluoride (PVDF), it is available in sizes from 1-1/2 in. to 14 in.
Company
Asahi/America, Inc.