论文部分内容阅读
在较大直径的输水管路中,常需安装一定数量的法兰闸阀。管接头一般为刚性接口,由于阀门两端的管子已被土压紧,几乎无活动余地。阀门维修更换时,又由于两法兰之间的垫圈已处在压缩状态,拆卸很困难,二次重装时更困难。如选用原厚的垫圈放不进去;如厚度选用小于原来的,密封达不到要求,常出现漏水现象。为解决上述问题,目前多采用套管式伸缩器(给水排水
In larger diameter water pipelines, it is often necessary to install a certain number of flanged gate valves. Pipe joints are generally rigid interfaces, and there is little room for movement because the pipes at both ends of the valve are compacted by soil. When the valve is replaced during maintenance, because the gasket between the two flanges is in a compressed state, the disassembly is difficult and it is more difficult to perform secondary reloading. If you choose to use the original thick gasket can not go in; if the thickness is less than the original selection, the seal can not meet the requirements, often leaking phenomenon. In order to solve the above problems, a sleeve type expansion device (water supply and drainage