Shijiazhuang Huawo Automobile Accessories Co.,Ltd We are an engine valve manufacturer,We have 29 years experience in production. It passed ISO9001 in 2006 and gained ISO/TS16949 certificate in 2008. we select high quality special valve bar material,such as. 4Cr9Si2,4Cr10Si2Mo,21-4N,X60,X80,21-4NWNB,GH751,Etc The production use connetion processing line,heat treatment with network continuous furnace,welding of double metals,valve seat welding (STELI),U quenching for valve rod slot,chrome plating and soft nitriding on surface, Product Information: Model:C15 Type:Intake&Exhaust OEM:1537023/2365605/1537024/4644668/4907198/4907199/4907200 Material:1.4718(X45CrSi93)/1.4871(X53CrMnNiN219) Size:STD MOQ:1 set Packing:Neutral packing or customized packing Delivery:3-7 days