Reducing

Reducing furnace — a furnace for reducing ores.

Reducing pipe fitting — a pipe fitting, as a coupling, an elbow, a tee, etc., for connecting a large pipe with a smaller one.

Reducing valve — a device for automatically maintaining a diminished pressure of steam, air, gas, etc., in a pipe, or other receiver, which is fed from a boiler or pipe in which the pressure is higher than is desired in the receiver.