... of engine valves,we have motorcycle valves, diesel engine valves ,auto engine valves and so on. we are a manufacturer, we ... passed ISO 9001 and ISO/TS 16949. 2. our engine valve kind is complete ,the quality is frist-class, the price ... ,VOLKSWAGEN AND SO ON. 4. We have all kinds of valve techniques, entire material valves, double mttal friction welding , small soldering ...