TDZ.TDZ was established on January 4, 2012, with its registered office located in Daqing City, Heilongjiang Province. Since 2015, the company has obtained 23 invention patents and 60 utility model patents, with products reaching advanced domestic standards. TDZ holds five Special Equipment Manufacturing Licenses and has successively obtained the following certifications between 2014 and 2021: American Petroleum Institute (API) Spec Q1 Quality System Certification, API Spec 11D1 Logo Certification, API Spec 5CT Logo Certification, and API Spec 6A Logo Certification. Primary products include: concrete products, construction machinery, electric motors, instruments and meters, canvas, globe valves, fasteners, electric heating cables, electric heating strips, water treatment equipment, ball valves, check valves, throttle valves, electric heating tubes, and specialized instruments and meters.