A pressure regulator is a device that controls the pressure of a fluid or gas in a system. It ensures that the pressure remains at a desired level, preventing fluctuations that could damage equipment or affect performance. Pressure regulators are commonly used in various applications, including gas pipelines, water supply systems, and industrial machinery. These devices work by automatically adjusting the flow of the fluid or gas based on the pressure detected. When the pressure exceeds a set limit, the regulator reduces the flow, and when it drops below the limit, it allows more flow. This helps maintain consistent pressure for safe and efficient operation.