青青草原综合久久大伊人_国产绿奴调教91_他用舌头给我高潮五六次_《性调教》在线播放_fre性欧美69巨大_国产品牌情久久久久久久男_添女人荫蒂全部过程视频_免费夜里18款禁用b站软粉色 _男女猛烈无遮挡_小茹的性荡生活第一部

Under what circumstances suitable for the use of non negative pressure water supply equipment?

    Non negative pressure water supply equipment, as a new energy saving water supply of new technology and equipment, has been a variety of water supply projects, is currently the two most pressurized water supply equipment. So the use of non negative pressure water supply equipment is also a certain condition, not all places are suitable for the use of non negative pressure water supply equipment. So under what circumstances the use of non negative pressure water supply equipment?
1 non negative pressure water supply equipment urban water supply network water supply capacity (water) and the size of the water supply pressure is to determine the "pipe network pressure water supply equipment" can not be the decisive factor. If the urban water supply pipe network water supply pressure is often in the case of more than 0.15Mpa, the equipment can be superimposed municipal pipe network pressure, energy saving effect is more significant.
Because the city water supply network pressure is not large, directly after pumping pressure drop must be very fast, and the city water supply pipe network to ensure the fire hydrant pressure not less than 0.15Mpa, and in the access tube must install a backflow prevention device, in our country the current minimum resistance of the backflow preventing stopper is about 0.03Mpa. In my opinion, the water supply pressure of urban water supply network is often better than 0.15Mpa. At the same time, it should be noted that different parts of the same city are also different, must be treated differently.
2 no negative pressure water supply equipment when the city water supply pipe network DN<300 should not use the "pipe network pressure water supply equipment", especially when the branch pipe network should be more careful.
3 non negative pressure water supply equipment must obtain the consent of the local water supply company in charge of the two water supply department, while obtaining reliable water supply capacity (flow and pressure) in the region.
4 no power supply reliability is restricted by the negative pressure water supply equipment "an important condition of pipe network pressure superposed water supply equipment", if the area often cut and no standby power, there will be "water power" phenomenon, because the device no water tank capacity can be used without section.
    Thus, no suitable conditions have a great relationship with the local negative pressure water supply equipment project of municipal pipe network pressure, because the device itself is the use of municipal pipe network residual pressure two times of pressure superposed water supply technology concept, so as to achieve energy saving, according to customer demand set of data reaches a certain amount will automatically shut down, so don't waste water resources. This is the two biggest advantage.