... flange.SIZE: 1/2" - 4".Seat: PTFE 1. Italian type thin Ball valve stainless steel OEM China casting manufacturer Main material: 304 and ... by autocar department of ASQC(American Society for Quality Control),AIAG,Kreisler motors company and Ford general motors company, ... result of material property,measure system analysis, regular lab documents control plan, PSW and samples).At the production stage, we ...