1970's
　　　 Company founded，specialized in manufacturing of all kinds of spare parts
　　　 of diesel engines.

1980's
　　　 Reorganized and focus on manufacturing of cylinder head system like valves,
　　　 seats and guides.

1990's
　　　 HD VALVE was put forward formally.
　　　 ISO9002 certified.
　　　 "Plasma welding machine" was imported from USA and the quality stability of
　　　 welding was significantly improved.

2000's
　　　 CCS, Lloyd's certified.
　　　 Nimonic valve manufacturing and friction welding
　　　 technology were applied to regular production.
　　　 Been approved by MAN（PIELSTICK），DAIHATSU and YANMAR to supply valves
　　　 and seats to their engines.
　　　 Worldwide agents and distributors were set in order to offer better service to
　　　 customers all over the world.