Easy structures and short dimensions are the remarkable features of dual plate check valves They are to be directly mounted between DIN flanges (PN 10, PN 16 or ANSI 150). Dual plate check valves require a low opening pressure. The resulting opening power directs the stems against the spring and the valve’s weight power, so that the media is released. If the initial pressure is higher than the entrance pressure, the valve closes and is sealed by the O-ring to protect it from the media. Dual plate check valves type are designed to block media on one side of the pipe within allowable pressure and temperature limits and to be installed in a pipe system only. They are only to be used with media, which the material and the seals are resistant to. They are not suitable for media with solid components.