... or regulating flow and its function allows for quick shut off. There are many ... different kinds of butterfly valves, each adapted for different pressures and different usage in the industry. ... : API 598, Flanged End Dimension: DIN PN10/16/25, ANSI B16.1, BS4504, ISO PN10/16, JIS B2212/2213, ... with eccentric tilting tapered valve seat sealing ring for the purpose if pressing out the sealing surface ...