ATD is the leading manufacturer of engine valve, valve seat and valve guides in China ,The factory covers an area of more than 25,000 square meters ,can produce 8million pieces of engine valves valve seats and valve guides per year.

The factory has advanced equipments :austenite solution treatment, P.T.A, tip and face, friction welding, nitriding and chromed on stem surface, stem-end'U"hardening, valve seat rolling harden, etc. The company has a testing center, with cylindricity tester, direct reading spectrometer, metallographic microscope, universal tool microscope, Vickers hardness tester, Rockwell hardness tester, tension tester, ultrasonic tester, roughness tester and so on. Can independently complete all valve testing from raw materials to finished products.