Usage : Chemtrols - Samil V-Port control valves are available in 1"(25mm) through 6"(150mm) sizes with full open Cv values of 3.0 through 400 in a wide range of materials to satisfy your flow control needs. Chemtrols - Samil Special Valves Urea Valves -with washing attachments Cage Control Valves PFA / FEP Lined Plug Valves Details on request.