... that produce all kinds of engine valves,we have motorcycle valves, diesel engine valves ,auto engine valves and so on. we are a ... material: INLET VALVE IS SUH1(40Cr) ; EXHAUST VALVE IS SUH3(4Cr9Si2).Engine valves are suitable for TOYOTA,AUDI,BESFORD,BMW,CATERILLAR ... ON.We have all kinds of valve techniques, entire material valves, double mttal friction welding , small soldering terminal pin, small ...