B300/B320 Series

B300 and B320 triple offset butterfly valves are created by designing the valve with the shaft located behind the centerline of the sealing surface (offset 1) and slightly to one side of the pipe centerline (offset 2). Offset 3 is the point of intersection of tangents of the seat and disc sealing deviating from the disc face.

These offsets are to eliminate all disc-to-seat friction throughout the valve’s entire 90 degrees of rotation. Metal seal and laminated seat are optional. The triple offset provides ANSI Class IV, V, and VI leakage performance. The seat seal ring can be changed easily from the body.

B300 is wafer type, B320 is double flanged type