A flange is a protruding rim, edge, rib, or collar, as on a wheel or a pipe shaft, used to strengthen an object, hold it in place, or attach it to another object. It is also used for a kind of tool used to form flanges. It can also be a plate or ring to form a rim at the end of a pipe when fastened to the pipe. A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together.

Flap opener provides a separate merging or motion from the side of the carton conveyor. The motion may be rotary or reciprocating and the actuator is custom-designed for the carton.

Flap type diverter valves are designed to divert powders and pellets in dilute phase pneumatic conveying systems. It consists of a casing in stainless steel lined with engineering polymer and a flap in engineering polymer with a steel core. The flap is activated by a manual lever, or by a pneumatic or electric actuator.