From the composition of pipe system, cast iron drainage pipe can be divided into three categories: straight pipe, pipe fittings and auxiliary parts. Direct pipe is the main component of the pipe system; various kinds of pipe fittings are the guarantee of the drainage system function (collecting, turning, ventilation, closing water, elimination Can slow pressure, check and clear obstacles, etc.); auxiliary parts mainly connect and seal function. W type is a commonly used connection form, with small radial size (no flange), easy to layout, space saving, length can be in the site according to the demand, section Provincial pipe, convenient disassembly, easy maintenance and replacement and other advantages.
