Lub laub - Hauv Kos Valve yog tsim rau kev sib txuas sai thiab zoo nyob rau hauv cov tshuab siv hluav taws xob. Nws lub laub - rau - Txuas Tsim Kom Yooj Yim Installation Tsis muaj qhov xav tau cov cuab yeej tshwj xeeb, ua rau nws zoo rau kev saib xyuas thiab hloov. Lub valve no tau lees paub ib - Txoj kev khiav, tiv thaiv backflow thiab ua kom lubrication ua haujlwm rau kev lag luam tshuab.