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Henan Kingwell Oil Equipment Co., Ltd is a professional producer of series butterfly valves, DEMCO butterfly valves equiv., gate valves, check valves, globe valves, air release valves, strainers, expansion joints and rigs, etc. KW brand valves are mainly used in oil & gas drilling and production, water, waste water, marine, chemical, power, mining industries. Kingwell adopts advanced CNC，scientif...