1. Qhib thiab kaw: Thaum lub ntsuas valve yuav tsum tau qhib, cov txheej txheem kev khiav hauj lwm txav cov tub ntxhais valve mus rau qhov chaw qhib, tso cai rau cov kua nruab nrab ntws zoo. Conversely, thaum lub ntsuas valve yuav tsum tau kaw, lub valve core yog tsiv mus rau qhov chaw kaw, thaiv qhov ntws ntawm cov kua nruab nrab.
2. Flow Regulation: Lwm qhov tseem ceeb ntawm lub ntsuas ntsuas valve yog tswj cov dej ntws ntawm cov dej nruab nrab. Los ntawm kev kho qhov chaw ntawm lub valve tub ntxhais, qhov loj ntawm cov kua dej tuaj yeem hloov pauv, yog li ua tiav kev tswj xyuas meej.