GONEC high performance butterfly valves are available in sizes DN50 to DN1500. The valve is manufactured in double flanged, wafer and shouldered (victaulic) pattern. The principal feature of the Gonec valve is its ability to seal against full line test pressure in both directions of flow - it is Bi-Directional. The valve is available from 10 Bar to 40 Bar. The standard valve incorporates resilient rubber seal ring that is located in the valves body perimeter, offset to the disc shaft centerline - the shaft does not pass through the seal. The seal and seat are spherically arranged with the inference adjustable by increasing the ring force through tensioning each clamp screw individually. Both seal and pressure rings are replaceable.