When it rains, you can hear, even if the sound insulation effect of the house is extremely excellent, the drain pipe will periodically emit a really terrible Gu dong sound, this is the gravity drain pipe, when the water is large enough, because of the gravity pressure, in the drain inlet will produce large pressure, water can not fall down, only with a lot of gas into the pipe, bubbles with water, It will rub against the wall, causing a loud sound. And because the water is continuously affected by the top pressure, the flow rate is very low. The HDPE siphon drain does not have this problem. China HDPE parts factory talk about the characteristics of siphon system drainage: 1. At the beginning of rainfall, if the height of the accumulated rainwater on the roof does not exceed the rainfall height designed by the siphon rainwater bucket, the drainage mode of the whole siphon drainage system is the same as that of the gravity drainage system. 2. Once the roof rain height exceeds the rain height designed by the siphon rain hopper, the siphon will occur in the pipe of the siphon system, and the drainage pipe in the system is in a state of full flow. At this time, the water in the pipe flows at a steep speed, and the roof rainwater is discharged to the outside at a steep velocity under the suction effect of the negative pressure in the pipe. Principle of siphon drainage From the above two characteristics, it is not difficult to draw the following two conclusions: 1. In a siphon drainage system, the discharge of the drainpipe is considerably larger than that of the drainpipe with the same diameter in a gravity drainage system. 2. For the same rainwater volume, the impact force of the water inside the pipe in the siphon drainage system on the pipe wall is greater and stronger. Therefore, the siphon pipe is under negative pressure, which requires extreme toughness of the pipe. The pressure of an ordinary PE pipe is not sufficient to meet the needs of the siphon drainage system. Special hdpe pipe fittings must be used. HDPE pipe has distinct advantages different from other pipes: 1. It can be connected by pair welding and capacitor welding to facilitate the formation of a closed anti-seepage system, especially when laying pipes along the trench, it can reduce the amount of trench digging and the use of accessories. 2, HDPE pipe weight is light, easy to install and handle. 3. Strong wear resistance and pressure resistance 4, HDPE pipe is extremely resistant to chemical corrosion, suitable for conveying sewage, natural gas, gas and other substances. 5, high service life, with more than 50 years of service life