standard as API/DIN/JIS,the material about cast/forged carbon steel,stainless steel,alloy steel and A890 F4 ,F51/F53 We are one of valves`manufactures in China,have many year`s experience.Name is Zhejiang ONERO VALVE CO.,LTD.Production gate,globe,check,ball valves ,the material with cast/forged carbon steel,stainless steel,alloy steel ,such as WCB,A105,CF8,F304,WC6,F11 etc. If you need,please ...