Chongani valavu: Cheke valavu, yotchedwanso valve imodzi kapena palibe valavu yobwerera. Ntchito yake ndikupewa kutuluka kwa sing'anga m'mapaipi. Valavu ya pansi pa chitoliro cholumikizidwa ndi pampu ndi pa valavu. Zigawo zotseguka ndi zotsekera zomwe zimagwira ntchito zokha kudzera mu mphamvu zopangidwa ndi sing'anga yoyenda kuti aletse ma valve. Chongani mavavu okha, makamaka amagwiritsidwa ntchito pa mapaipi amodzi omwe amangolola sing'anga kuti muchepetse ngozi. Valani mavuvu opindika ndi ofukula kapena opingasa. Fomu yake imaphatikizapo kuphatikiza cholumikizira, cholumikizidwa ndi kuwotcherera.
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