We are DOXI, one of XUANDA Indus. Group?s brands, who specialized in TEFLON LINED VALVES.1.Teflon Ball Valve2.Teflon Butterfly Valve3.Teflon Check Valve4.Teflon Diaphragm Valve* Unique triple-seal-structure which has won the national patent.* Capability to produce maximum dimension of DN1800/NPS72. * Offers a Class 10000 Cleanroom for high purity applications.