... equipment,HIP 4.Good service tungsten carbide balls in various of sizes * High strength, high wear resistance, high precision, ... resistant. * They are mainly used for the sealing of valves of oil pumps in petroleum industry's sand containing wells, ... Xinhua West Road, Hetang district, Zhuzhou, Hunan, P.R.ChinaPostal code: 41200Tel: +86-731-28339730Fax: +86-731-28337210Mobile: +86-15973362017Website: ...