Definox DPAX DN100 Spring Pressure Check Valve is a 4-inch (DN100) spring-loaded check valve designed to prevent backflow in piping systems. As part of the DPAX series, it uses a compression spring to hold the valve closed when reverse pressure is present and opens to allow forward flow when upstream pressure exceeds the spring force. The DN100 (4") nominal size supports standard 100 mm pipe installations, providing reliable backflow prevention in liquid piping applications.
