... equipment.We have two kinds of material,the good and normal, good material: INLET VALVE IS SUH3(4Cr9Si2) ; EXHAUST VALVE IS SUH35( ... ,VOLVO,VOLKSWAGEN AND SO ON.We have all kinds of valve techniques, entire material valves, double mttal friction welding , ... small soldering terminal pin, small soldering alloy, shaft chromium-plating , surfacing nitration treatment.Of course , we can ...