Catalog of Double Eccentric Butterfly Valve KOPERANI Catalog ya Tilting Disc Check Valve KOPERANI Catalog ya Centerline Type Butterfly Valve KOPERANI Catalogue ya DIN PN16 Ductile Iron Valve KOPERANI Catalogue ya API Gate, Check, Globe, Ball Valve KOPERANI Catalog of Triple Metal to Metal Seat KOPERANI Catalog ya Triple offset Butterfly Valve KOPERANI