Qhov UPVC foot valve no tau los rau pump suction lines. Thaum pump sau, nws tsim ib qhov vacuum/suction uas yuav ntxoov lub ball hauv, txhim kho kom dej dhau los ntawm sab nraud mus sab saud. Thaum pump ncav, lub zog suction yuav ncav, thiab lub ball yuav tso lawm rau saub nrog lawv qhov chaw nyob, rov kaw valve kom tsis txhob muaj kev rov qab thiab tshem kub dej nyob hauv pump.
