Lub tshuab nqaij thiab lub tshuab kub tshuab yog qhov cuab yeej tseem ceeb uas pab hloov cov nqaij rau hauv tsev thiab rau hauv qhov chaw ua haujlwm. Nws tsis yog lub tshuab twg li; nws muaj lub kub tshuab tseem ceeb uas kub cov khoom tawg rau hauv cov nqaij ua ntej khiav cov nqaij mus. Qhov no yog tseem ceeb heev rau cov chaw uas cov nqaij yuav tsum mus rau saum toj lossis mus rau ntev heev. Yog tsis muaj lub kub tshuab, cov khoom tawg yuav pab cov nqaij thiab ua qhov tsis zoo heev. Cov tshuab no pab ua kom txhua yam mus zoo thiab pab tswj cov chaw kom zoo thiab nyab xeeb.
Qhov kub tshuab ntsuas dej tsis zoo uas muaj qhov kub tshuab tshuab tawm yog qhov khoom uas ua haujlwm los txuag dej tsis zoo ntawm lub tsev. Thaum koj tshuab qhov suab lossis tshuab dej, cov dej thiab cov ntaub ntawv yuav mus rau hauv qhov chaw uas hu ua qhov chaw tshuab dej. Ntawd yog qhov chaw uas qhov kub tshuab yuav nyob. Nws nyob rau hauv qhov chaw tshuab dej thiab rov saib kom dej yuav ncav mus rau qhov siab. Thaum dej ncav mus rau qhov siab tshwj xeeb, qhov kub tshuab yuav tshuab. Qhov kub tshuab hauv nws yuav tshuab ntev heev thiab tshuab cov ntaub ntawv uas tsis zoo li cov ntawv tshuab suab lossis cov ntaub ntawv noj rau hauv cov ntaub ntawv leej ntim. Qhov no yog tshwj xeeb vim thaum cov ntaub ntawv no yog loj heev, nws yuav tshem qhov tshuab. Tom qab tshuab, qhov kub tshuab yuav tshuab cov ntaub ntawv leej ntim thiab dej rau hauv cov tshuab mus rau hauv qhov tshuab dej lossis qhov tshuab dej uas muaj qhov tshuab dej. Qhov kev tshuab no yuav pab tshem qhov tshuab thiab tshem qhov tshem. Qhov kev xaiv ntawm cov kub tshuab no yog qhov tshwj xeeb rau kev ua haujlwm. Nws tuaj yeem tshem cov ntaub ntawv ntau thiab siv rau hauv qhov chaw nyob rau hauv qhov tsev lossis qhov chaw uas nyob rau hauv qhov siab tshaj qhov tshuab yuav tsis tuaj yeem pab. Yog li ntawd, nws yog qhov tshwj xeeb rau kev tshem qhov tshuab dej uas zoo. Piv txwv li, Submersible Axial-Flow thiab Mixed-Flow Pumps siv rau qhov kev tshuab no.