thediscussionofwater-savingtechnologyaboutwatersupplyanddrainageinbuilding-外文文献(编辑修改稿)

thediscussionofwater-savingtechnologyaboutwatersupplyanddrainageinbuilding-外文文献(编辑修改稿)内容摘要：

D SANITARY WARE A. Adopt watersaving waterdispensing fixtures. When hydraulic pressure is the same, the amount of saving water of Ceramic core watersaving taps and inflating taps, etc. is between 20% ~ 30%. The ceramic core watersaving tap not only has good sealing performance, there is nodrip after switch on and off tens of thousands of times, but also has significant watersaving effect. Especially when static pressure is higher and the water yield of ordinary tap is larger, the volume of saving water of watersaving taps is larger. Watersaving shower only need 9 L water every minute which can save half amount of water pared with ordinary shower. In public buildings the delayedselfclosing or photoelectriccontrol faucets and flush valve is used to avoid waste of water. Because the time of discharge of these sanitary appliances can be adjusted within a certain range. On the other hand, these sanitary appliances can operate by themselves to prevent spread of bacterium. B. Adopt watersaving sanitary ware The amount of water volume of the flushing toilet in residence occupies about 30% ~ 40% water volume of the whole day. In current toilet of residence, big and urination Share the same toilet stool and adopt the same flushing water, the flushes water volume is larger or equal 11L. Water consumption is large. This is obviously a waste. In addition to the toilet bowl whose volume of flushing water is less or equal 6L has been promoted to use, there is a kind of toilet stool which has two gears’ cistern [4]. The flushing water is 3L when flushing urination, while flushing water is 6L when flushing shit. V. PROMOTE THE UTILIZATION OF HIGHQUALITY PIPE AND VALVE Galvanized steel pipe has been widely used in drinking water supply system in the internal building as a water main pipe. However, corrosion of galvanized steel is easy to produce and breed bacteria, which can not only cause serious secondary pollution for water quality, but also the leakage of corrosion can lead to the waste of architectural environment and water resources. China39。 s Ministry of Construction and the other four ministries jointly issued a document, the document required that the cold galvanized steel pipe was banned used as the water supply pipes of newlybuilt residences in national urban since June 1st, 2020. Based on the local conditions, the hot galvanized steel pipe is gradually prohibited to use and the latemodel pipe is promoted to use. In the construction’s water supply system, plastic pipes mainly consist of low plastic rigid polyvinyl chloride pipe (PVCU), chlorinated polyvinyl chloride pipe (PVCC), highdensity polyethylene pipe (HDPE), crosslinked polyethylene pipe (PEx), polypropylene pipe (PPR), polybutylene pipe (PB) and acrylonitrilebutadienestyrene pipe (ABS), etc. Composite pipes include AluminiumPlastic Composite pipes， plasticcoated steel tube, steelplastic posites pipe，etc. Metal pipes have copper pipes and stainless steel tube, etc. Compared with Galvanized steel pipes, plastic pipes have advantages in economy. Although the cost of Copper pipes and stainless steel tube is higher, the mean life may last longer and also can be used for hot water system. So we had better consider 670669the construction’s function, property, specification, the level and water supply before choose the appropriate highquality water supply pipes. The valve is the most mon accessory in building water supply and drainage, whose types and level of quality is the key of affecting watersaving. Generally speaking, the globe valves shut tighter than gate valves, and gate valves shut closer than butterfly valves. Hydraulic valves overe the large size of float valves, and overe the overflow and other disadvantages caused by plug stuck。