Founded in 2011 and located in Wenzhou, Zhejiang, with a registered capital of RMB 10.89 million, ZNZK (ZHENGNUO) specializes in the R&D and manufacturing of self-operated control valves. The company supports various connection types, including internal thread, external thread, flanged, and welded connections. Its products are widely used in petroleum, chemical, natural gas, electric power, water supply, pharmaceuticals, metallurgy, food, and other industries, and are sold both domestically and exported worldwide. Its main product lines include ball valves, globe valves, gate valves, butterfly valves, and other related series.