Pob lub pob, lub valve uas qhib thiab kaw qhov (pob) tau tsav los ntawm lub qia lub qia thiab tig ncig ib puag ncig ntawm lub pob valve. Nws kuj tseem tuaj yeem siv rau kev hloov dej thiab tswj. Ntawm lawv, qhov tawv-kaw V-puab lub pob valve muaj lub zog shear quab yuam nruab nrab ntawm V-puab cov tub ntxhais thiab lub rooj hlau ntawm cov tawv tawv tawv tawv. Nws yog qhov tshwj xeeb tshaj yog tsim rau cov fibers thiab cov khoom me me. Thiab lwm yam xov xwm. Lub pob ntau txoj hauv kev tuaj yeem tsis tsuas yog tswj tau qhov sib tshuam, sib txawv, thiab hloov pauv ntawm cov kev taw qhia ntawm qhov nruab nrab ntawm cov raj xa dej, tab sis kuj kaw ib qho channel thiab txuas rau lwm ob txoj hauv kev. Hom valve no feem ntau yuav tsum tau teeb tsa kab rov tav hauv cov raj xa dej. Raws li txoj kev tsav tsheb, lub pob valve tau muab faib ua: lub pob pneumatic, lub pob hluav taws xob, lub pob siv phau ntawv.
Lub pob valve tau tawm hauv xyoo 1950. Nrog kev txhim kho sai ntawm kev tshawb fawb thiab thev naus laus zis, kev txhim kho txuas ntxiv ntawm kev siv thev naus laus zis thiab cov khoom lag luam, hauv tsuas yog 40 xyoo, nws tau hloov pauv sai sai rau hauv qeb loj valve. Hauv cov tebchaws sab hnub poob tsim, kev siv pob li qub tau nce ntau xyoo los ntawm xyoo.
Hauv peb lub tebchaws, pob pob tau siv dav hauv kev kho cov roj av, cov kav dej ntev, cov tshuaj, tshuaj tua kab, tshuaj, kev txuag dej, hluav taws xob, kev tswj hwm hauv nroog, hlau thiab lwm yam lag luam, thiab muaj txoj haujlwm tseem ceeb hauv kev lag luam hauv tebchaws. Nws muaj qhov kev ua haujlwm ntawm tig 90 degrees, lub cev qaib ntxhw yog tus kheej, nrog ncig los ntawm lub qhov lossis cov channel hla los ntawm nws cov axis.
Lub pob valve feem ntau yog siv los txiav tawm, faib tawm thiab hloov txoj kev khiav ntawm qhov nruab nrab hauv cov raj xa dej. Nws tsuas yog xav tau tig 90 degrees thiab lub zog me me tuaj yeem kaw nruj. Lub pob valve yog qhov tsim nyog tshaj plaws los siv ua qhov hloov pauv thiab kaw lub pob valve, V-shaped ball valve. Ntxiv rau qhov ua tib zoo saib xyuas cov raj xa dej, cov khoom siv hluav taws xob yuav tsum tau them nyiaj tshwj xeeb rau cov xwm txheej ib puag ncig uas lawv tau siv. Txij li cov cuab yeej hluav taws xob hauv lub tshuab hluav taws xob yog lub tshuab hluav taws xob, nws cov xwm txheej siv tau cuam tshuam loj heev los ntawm nws qhov chaw siv. Nyob rau hauv ib txwm muaj xwm txheej, tshwj xeeb yuav tsum tau them nyiaj rau siv hluav taws xob pob li qub thiab npauj npaim li qub hauv ib puag ncig hauv qab no.
