Flapcon® CV20 Series Disc Check Valves are manufactured to prevent backflows in piping systems. It provides economical solutions thanks to easy connection and short spots. It is produced according to DIN EN 558-1, line 49 however there are special production for other connection standards. The most striking feature of disc type check valves is that they provide an optimum solution when flanges with larger nominal widths are necessary or more convenient. CV20 type disc check Valves are compatible for industrial use in piping systems for the transport of liquid or gas fluids. Disc check valves may have any mounting position. It is opened by medium pressure and is closed again by a spring before the back pressure is established. They are opened by medium pressure and are closed again by a spring before a reverse gear is formed.