... valves, diesel engine valves ,auto engine valves and so on. We have exported many years and many countries.We have ... normal, 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 ... ,ROVER,SUBARU,SUZUKI,VOLVO,VOLKSWAGEN AND SO ON.4. We have all kinds of valve techniques, entire material valves, double metal ...