Zhejiang Gongzheng auto parts factory is China air brake valve manufacturers and suppliers, we OEM/ODM Truck Air Dryer Assembly air brake valve and other components for air brake system.Zhejiang Gongzheng auto parts factory was founded in 1990, which is specializing in the production of commercial vehicle air brake control components. The factory covers an area of 30000 square meters, and the workshop area is 28000 square meters. We have established a comprehensive quality control system according to ISO 9001:2000 standards.We have obtained ROHS, SGS certification, and follow the international standard quality system, and strictly check each process.