The DBP series connecting diaphragm valve is a valve that combines two DLP or DHP series ultra pure diaphragm valves (two in one) into one. Through a shared piping flow path, it minimizes dead zones while maintaining excellent degassing characteristics. The connecting diaphragm valve not only inherits the basic performance of the prototype valve, but also designs the most compact piping system through the combination of similar or different types, greatly saving space.