FREE-VALVE’s Stainless Steel Ceramic Lined Butterfly Valves are operated in the harshest control environments and offers excellent resistant to abrasion and corrosion which is major problem for industrial valves. The ceramic materials are applied to the sealing surface of butterfly valve.These ceramic materials are 6-8 times harder than stainless steels and the result is a control valve that functions properly in a harsh, abrasive service environment.