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,