Pressure regulators are used to maintain a constant outlet pressure or flow

IC voltage regulators are three-terminal devices that provide a constant DC output voltage that is independent of the input voltage, output load current, and temperature.

Hydraulic regulators maintain the output pressure at a set value

Air pressure regulators control pressure in air lines (usually adjustable) to remove fluctuations and maintain consistent pressure for pneumatic devices

Air valves allow metered fluid flow in one or both directions.

Speed controls, including speed regulators and rate controllers, are used to decelerate and regulate the speed of loads such as moving carriages and machining feeds near the end of their travel

Current limiting diodes (CLD) regulate current over a wide voltage range.