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Backflow prevention device LS21X-16T
Product Name:
Backflow prevention device LS21X-16T
Description:

倒流防止器 LS21X-16T

产品介绍:
  LS21X-16T倒流防止器用于防止生活饮用水管道发生回流污染的安全装置,防止饮用水回流污染的新颖阀门,以确保生活饮用水的卫生和安全。

产品的结构
  LS21X-16T安全型倒流防止器是由两级及一个排水泄压系统组成,排水泄压系统上腔与第一级止回系统进口端连接。第一、第二止回系统主要由阀体、进水口接头、帆辩、蜜封垫、弹簧等组成。排水泄压系统主要由阀盖、膜片、阀芯、密封垫、排水口、弹簧、空气阻隔器等组成。

工作原理
  LS21X-16T 倒流防止器是在二级止回系统增设一个排水泄压装置,这样即使二级止回密封同时破坏,其也能起到防止回流污染的作用。其工作原理:
  1.正常共水:
  A.清洁市政生活水从第一级止回系统经过排水器到第二级止回系统出口向用户供水,第一级止回系统进口高压水进入排水隔膜上腔,而隔膜下腔与第一级止回阀出口(第二级止回阀进口)相通,由于其存在一定的压差,推动阀辫下移,排水器关闭,倒流防止器正常供水;
  B.当阀后管路无用户,水静止,如进口压力保持不变,其前后存在压差,排水器仍呈关闭状态;
  C.如进口压力下降,其前后压差下降到一定值时,弹簧推动阀芯向上,排水器开启泄压到与进口压力恢复一定压差值时,排水器又关闭。
  2.密封失灵时:
倒流防止器之后管网压力升高,超过阀前进口压力时,如第二止回阀密封完好无参漏,高压水不会倒流,排水器隔膜上下保持原来压差,排水器关闭,不泄压。当第二止回阀密封破坏产生参漏,第二止回阀之前压力升高,造成排水器隔膜上下压差减小,排水器打开,排水泄压:此时,如第一级止回阀同时密封破坏,由于第二止回阀倒流回的高压水已泄压减压,故不会倒流回第一级止回阀。
  3.如供水过程中供水压力不断下降,则排水器隔膜上部压力下降,安全排水器控制弹簧推动阀芯打开排水器排水。当进口压力下降至零或负压时,排水器完全打开,水排出,空气从排水器进入真空腔,从而防止产生虹吸倒流现象。

主要性能参数
  使用压力:1.6MPa
  使用介质:洁净水
  介质温度:≤60℃

倒流防止器安装部位
  1.自来水管网接入用户的接户水表后面
  2.生活用水管道上接出非生活饮用水和排污管,安装与接出管起端。
  3.生活饮用水水箱的进入管上(水箱底部进水时)。
  4.生活饮用水水管道上串联加压时安装于泵吸水管上。


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