城北四镇农村供水管网减压方案比选及减压阀设计

Comparison and Selection of Decompression Schemes and Design of Pressure Reducing Valve for Rural Water Supply Network in Four Towns in the North of the City

当供水管网静压过大时,会带来大概率爆管问题,对此应进行减压设计。文章以新疆昌吉城北四镇农村供水管网为例,通过减压方案比选,方案一的减压稳压阀控制压力受流量变化影响小,下游压力随上游压力变化很小(小于0.03 bar),可平衡阀芯上的作用力,下游压力可精确控制并且稳定,阀门寿命很长,不存在水质二次污染,确定使用减压稳压阀控制工程管道沿线水压,以满足供水需求。同时,以此对对减压阀构造及控制原理,以及减压阀安装位置进行了阐述说明。在减压阀安装过程中,在满足动水压力要求基础上设置减压阀,设计将入村口静压控制在20~30 m之间,最大≤40 m,并确定位置43处,通过复核计算得出减压效果符合要求。

When the static pressure of water supply network is too large,it may cause the problem of high probability of pipe burst.Thus,decompression design should be carried out.Taking the rural water supply network of the four towns in the north of Changji City in Xinjiang as an example,comparison and selection of the decompression schemes are conducted in this paper.The control pressure of the decompressure-stabilized valve in Scheme 1 is little affected by the change of flow,and the downstream pressure changes very little with the value of less than 0.03 bar with the change of upstream pressure,which can balance the force on the valve core.The downstream pressure can be precisely controlled and stablilized.The service life of the valve is very long.There is no secondary pollution of water quality.Therefore,the reduced pressure regulator valve is used to control the water pressure along the pipeline to meet the demand of water supply.At the same time,the structure and control principle of the pressure reducing valve,as well as the installation position of the pressure reducing valve are described.In the installation process of the pressure reducing valve,the pressure reducing valve is set on the basis of meeting the requirements of hydrodynamic pressure.The static pressure at the entrance of the village is controlled between 20~30 m,with the maximum less than 40 m,and 43 positions are determined.The pressure reducing effect meets the requirements through the review calculation.