What type of valves are used to control or limit flow to the compressed air system?

Relief valves are specifically designed to protect a compressed air system from excessive pressure that could lead to system failure or damage. They automatically open to release excess pressure when it exceeds a predetermined limit, thereby ensuring that the system operates within safe parameters. This functionality is crucial in preventing accidents and maintaining the integrity of the system.

While check valves, ball valves, and gate valves serve important roles in controlling flow, they do not inherently limit flow based on pressure conditions like relief valves do. Check valves are used primarily to prevent backflow, ball valves allow for on/off control of flow, and gate valves are typically used for isolation purposes rather than for pressure regulation.