A double offset butterfly valve shifts the shaft position away from the disc centerline in two directions, offset from the pipe centerline and offset from the seat centerline, which lifts the disc away from the seat immediately as it begins to rotate open. This eliminates the constant rubbing contact found in a concentric design, since the disc only touches the seat in the final degrees of closure rather than throughout the full rotation. The reduced contact wear extends seat life significantly and allows this design to handle higher pressure and temperature service than a standard concentric butterfly valve.

Common Applications

• Higher pressure and temperature service beyond concentric valve limits
• Applications requiring extended seat life under frequent cycling
• Chemical and petrochemical process isolation
• Larger diameter lines where reduced torque matters