Zhonghai shipping spare parts manufactory specializes in producing various engine valves since 1990,which collects together research and development ,production and sales .our factory covers an area of 20000square meters ,with advanced technology and production process,strict testing measures to ensure better product quality ,after nearly 30years effort ,our factory has rich experience in manufacturing diesel engine valves and has become one of the biggest engine valve factories in China .Our factory owns more than 150 advanced special equipments,introduced technique from Japanese FUJI,using electric upsetting, double metal friction welding,blasting,chrome-plating,solution heat treatment,form grinding,polishing spiral,mirror polishing,the valve surface using stellite or Ni-base alloy welding process, the stem using Nitrogen gas fasification process,high precision and wear resistance.