Ball Valves: Ball valves are widely used in natural gas pipelines, oil transport systems, and liquid fuel transportation due to their excellent sealing performance and quick opening and closing features. For example, the API 6D ball valve ensures tight sealing when transporting high-pressure natural gas.

Relief Valves: Used in petrochemical reactors and storage tanks, relief valves automatically open when the system pressure exceeds set limits, preventing explosion risks. The API 520 relief valve is a critical component in pressure vessels in refineries.

Diaphragm Valves: Used to control the flow of highly corrosive liquids or chemicals in acid-base regulation and chemical material transport systems.