A pressure regulator is a control device used to reduce high or fluctuating inlet pressure to a stable, lower output pressure suitable for safe system operation. It automatically adjusts to changes in supply or demand, ensuring that air or fluid is delivered at a consistent pressure to protect equipment and maintain reliable performance.

Pressure regulators are widely used in pneumatic systems, gas supply lines, process industries, laboratories, and HVAC systems. They improve system stability, prevent overpressure damage, reduce energy waste, and help maintain accurate control over industrial and commercial processes.