The Type 567 product range from Georg Fischer Piping Systems now also includes DN 350 to DN 600 models for the materials PP-H with models DN 350 to DN 400 being available for PVC-U. Thanks to the double-eccentric function principle the contact surfaces between medium and elastomers is reduced. In connection with pressure support from a transition seal, it is possible to achieve an activating torque which is up to 50 % lower, in comparison with centric valves, whereby the plate has no contact with the seal in the open position.
Double-sided sealing inside the passage section is guaranteed with the aid of a sealing ring equipped with a specially adapted sealing geometry. External sealing within the axis area is achieved by means of O-rings. The design of the valve has been arranged to suit all conventional connection standards (ANSI/BS, ISO-DIN, JIS), so that only one version is necessary. A standard interface also ensures a problem-free connection of actuators. All butterfly valves are supplied complete with either manual or pneumatic actuators or with electric actuator ex works.