Pilot-operated devices are mechanisms that use a small input signal to control a larger output. They typically consist of a pilot valve that regulates the flow of fluid or air, allowing for precise control of larger systems. These devices are commonly found in hydraulic and pneumatic systems, where they help manage pressure and flow rates efficiently. These devices are essential in various applications, including industrial machinery, automotive systems, and aerospace technology. By using a small force to control a larger one, pilot-operated devices enhance performance and safety, making them vital components in modern engineering.