... and many countries. We have passed ISO 9001 and TS16949Engine valve kind is complete ,the quality is frist-class, the ... , good material: INLET VALVE IS SUH3(4Cr9Si2) ; EXHAUST VALVE IS SUH35(21-4N), normal material: INLET VALVE IS SUH1(40Cr) ; EXHAUST VALVE IS SUH3(4Cr9Si2 ... ,VOLVO,VOLKSWAGEN AND SO ON.We have all kinds of valve techniques, entire material valves, double mttal friction welding , small ...