500R系列是控制硫酸、盐酸、氯气等有毒、腐蚀性流体的控制阀。本体内部接触流体部位全部用聚四氟乙烯制造，填料部分也用聚四氟乙烯波纹管完全密封。另外在聚四氟乙烯阀体外侧加金属外壳补强，坚固耐用。

This series provides globe type control valves for controlling corrosive and/or poisonous fluids. Body wetted parts are made of pure teflon and gland parts are completely sealed by bellows seal bonnet made of pure teflon. Body is coverd by cast iron or stainless body cover which is resistant to shock form outside.