In terms of pipeline system composition, cast iron drainage pipes can be divided into three categories: straight pipes, pipe fittings, and auxiliary parts. Straight pipes are the main component of the pipeline system; a wide variety of pipe fittings are the guarantee for realizing the functions of the drainage system (gathering, steering, ventilation, closing water and air, extinguishing, etc.) It can slow down pressure, check and clear obstacles, etc.); auxiliary parts mainly play the role of connection and sealing. The double flange (type B) connection combines the advantages of the W-shaped straight pipe length that can be cut on demand and the high strength of the A-shaped interface, and is gradually accepted and selected by the market.
