- Kaizheng Valve Co., Ltd. is a professional manufacturer of forged steel valves, API Valves, Ball valves and Butterfly valves of various specifications. Materials: A105, LF2, F5, F11, F22, 304, 304L, 316, 316L, etc., design standards: API, DIN, JIS, GB, BS, etc. It is widely used in petroleum, chemical industry, papermaking, shipping, electric power, machinery and other industries.