Ob lub pob valveyog qhov kev xaiv nrov hauv ntau daim ntawv thov kev lag luam thiab kev lag luam, tshwj xeeb tshaj yog thaum tswj cov dej ntws. Cov valve no yog ahom lub quarter-tig valveuas siv lub hollow, perforated, thiab rotating pob los tswj cov dej ntws, huab cua, roj, thiab ntau yam kua dej. Rau ob-thooj pob li qub, PVC yog ib yam khoom siv vim nws cov kav ntev thiab corrosion kuj.

Kev ua haujlwm ntawm ob lub pob valve yog qhov yooj yim tab sis siv tau. Thaum lub valve kov tig, lub pob hauv lub valve tig kom tso cai lossis tiv thaiv cov kua dej ntws. Qhov no ua rau nws zoo tagnrho rau cov ntawv thov uas xav tau kev tswj xyuas qhov ntws. Ob lub pob valve tseem tsim los kom yooj yim rau kev tswj thiab kho, ua kom muaj txiaj ntsig zoo rau ntau qhov kev lag luam.

Rau PVC ob-thooj pob li qub, cov khoom siv no muaj ntau yam zoo. PVC (los yog polyvinyl chloride) yog cov khoom siv thermoplastic uas paub txog nws cov tshuaj tiv thaiv zoo heev, ua rau nws zoo tagnrho rau kev siv qhov twg li qub tuaj rau hauv kev sib cuag nrog ntau yam kua. Ntxiv thiab,PVC yog lub teeb yuag thiab yooj yim rau nruab thiab tuav. Nws kuj yog qhov ruaj khov heev, ua rau nws siv tau ntev thiab txhim khu kev qha rau ob lub pob li qub.

Ib qho ntawm cov haujlwm tseem ceeb ntawm ob lub pob valve yog muab lub kaw ntom nti. Kev tsim ntawm lub valve tsim muaj kev ruaj ntseg foob thaum kaw, tiv thaiv kom tsis txhob muaj cov kua dej tswj tau. Qhov no yog qhov tseem ceeb hauv cov ntawv thov uas qhov dej xau yog kim lossis txaus ntshai. Cov khoom siv PVC siv nyob rau hauv ob-thooj pob li qub kom ntseeg tau tias lub valve tseem kaw nruj rau lub sijhawm ntev, txawm tias raug tshuaj hnyav lossis kub heev.

Lwm qhov tseem ceeb ntawm ob lub pob valve yog lub peev xwm los tswj cov dej ntws. Los ntawm tsuas yog tig tus kov, tus nqi ntws tuaj yeem hloov kho kom tau raws li qhov tshwj xeeb ntawm daim ntawv thov. Kev tswj hwm qib no yog qhov tseem ceeb hauv ntau qhov kev lag luam, los ntawm cov chaw kho dej mus rau cov chaw kho tshuaj. Cov khoom siv PVC siv nyob rau hauv ob lub pob li qub kom ntseeg tau tias lawv tuaj yeem ua tau raws li kev tswj hwm kev xav tau ntawm ntau yam kev siv.

Ob-thooj pob li qub kuj muaj qhov zoo ntawm kev yooj yim rau disassemble thiab tswj. Qhov no yog qhov tseeb tshwj xeeb tshaj yog rau PVC ob-thooj pob li qub, qhov twg cov khoom siv lub teeb yuag thiab ruaj khov ua rau kev saib xyuas thiab kho cov haujlwm yooj yim thiab raug nqi. Qhov no, txuas nrog nws cov kaw ntom nti kaw thiab ntws tswj kev tswj hwm tswj hwm, ua rau lub pvc ob-thooj pob valve ib qho kev ntseeg tau thiab kev xaiv tswv yim rau ntau yam kev siv.

Hauv cov ntsiab lus, kev ua haujlwm ntawm ob-daim pob valve (tshwj xeeb yog ib qho ua ntawm pvc) yog los muab cov khoom kaw nruj, tswj cov kua dej, thiab yuav yooj yim tswj. Thaum tswj cov dej ntws, huab cua lossis tshuaj lom neeg, ob lub pob li qub yog ib qho kev xaiv ntau yam thiab txhim khu kev qha rau ntau qhov kev lag luam. Nws txoj kev tsim qauv yooj yim tab sis zoo ua ke nrog qhov zoo ntawm cov khoom siv PVC ua rau nws zoo tagnrho rau ntau yam kev siv.