... in 1985 supply all kinds of OEM intake & exhaust valve non-magnetic and magnetic material ISO 9001 1 ... produce all kinds of engine valves,we have motorcycle valves, diesel engine valves ,auto engine valves and ... 9001 and ISO/TS 16949.2. our engine valve kind is complete ,the quality is frist-class, ... SO ON. 4. We have all kinds of valve techniques, entire material valves, double mttal friction welding ...