A regulator is a pressure control device used to reduce and maintain a constant output pressure from a higher and often fluctuating input pressure source. In pneumatic and fluid systems, regulators ensure that air or fluid is delivered at the correct pressure level required for safe and efficient operation of downstream equipment.

Regulators are widely used in industrial automation, pneumatic circuits, gas systems, laboratories, and process industries. They protect components from overpressure, improve system stability, reduce energy waste, and help maintain consistent performance. Choosing the right regulator is essential for system safety, accuracy, and long-term reliability.