CJW special single riser system is one of the pipe network fittings of the sewage drainage system in the construction area. This is a new process that is replacing the original double riser drainage network system. Its advantages are: unique design, CJS swirl joint has built-in swirl guide vanes and overall capacity expansion. After the water flow in the riser and cross-branch pipes passes through the rotational diversion of the blade, the falling water flows down the pipe wall in a swirling shape; the resulting rotational centrifugal force, even if the water flow speed is faster, the stronger the rotational force; forming in the riser The unobstructed air core balances system air pressure fluctuations, ensuring that the water seal of sanitary appliances is not damaged, and truly achieving single-pipe drainage and ventilation. Its advantages are mainly as follows: large drainage flow, quiet and noise reduction, occupying less area, saving raw materials, easy installation and long service life. The history and prospects of special single riser pipes: Special single riser drainage systems have been used in multi-story and high-rise buildings in European and American continents, Japan, South Korea and other countries for more than 30 years. This system does not require ventilation risers and can improve the air pressure fluctuations in the piping system and the water flow conditions. It has the advantages of saving pipe materials, occupying less building area, and reducing construction costs.