Shijiazhuang Haoda Internal Combustion Engine Parts Co., Ltd. was founded in 1990. Our company is a professional manufacturer of automotive valves and internal combustion engine intake and exhaust valves. The company has advanced technology and excellent equipment, with various processing and testing equipment such as bimetallic friction welding and plasma surfacing. It also has advanced production processes such as conical surfacing, spiral polishing, rod end quenching, rod plating, nitriding, and surface laser treatment. The company introduces PAL CNC automation specialized production machinery; Especially in the surface treatment of the valve, the German QPQ salt bath soft nitriding process is adopted...[more]