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By certification 
Valve including: Valve Spindle, Valve Seat, Valve Guide, Valve Clamp, Valve Rotator, Valve Casing.
VALVE SPINDLE series: The material offered by SANYO SPECIAL STEEL Co., Ltd of Japan, and make the parts in our factory, the series number for this two type of steel are: JIS-SUH3 and JIS-SUH36. The parts are main for Japanese machine, like YANMAR, DAIHATSU, AKASAKA, HANSHIN, NIIGATA etc.
VALVE SPINDLE series: The material offered by SANYO SPECIAL STEEL Co., Ltd of Japan, and make the parts in our factory, the series number for this two type of steel are: JIS-SUH3 and JIS-SUH36. The parts are main for Japanese machine, like YANMAR, DAIHATSU, AKASAKA, HANSHIN, NIIGATA etc.
