Reducing Flange is reduced bore flange to facilitate connections with other flange smaller than the reducing flange. Often referred as Reducer Flange.
Reducing Flange can be fabricated using a reducing spool with concentric or eccentric reducer & desired flange at each end OR it could be a single flange with internal reduced bore to connect different sized fittings on either sides.
Reducing Flanges need to be described by bigger Inlet size & smaller Outlet size.
These Flanges can be either forged or can be directly machined from heat treated plates. Plate forming is preferable for smaller sized Reducing Flanges.