Cooperating with more than 500 China Valve Manufacturers, Dervos is a professional supplier and exporter of industrial valves, providing valves, steel pipes, flanges, pipe fittings, and fasteners for gas, oil, water treatment, petrochemical, pipeline, power station, and marine industries. Our valve products include ball valve, butterfly valve, check valve, gate valve, globe valve, plug valve, and strainer etc in various materials, sizes, standards and types.