Lub pob valve yog cov khoom tiav thiab cov khoom lag luam qub. Nws siv thaj chaw uas lub pob tub ntxhais kiv thiab lub pob valve qhib kom qhib txhawm rau txhawm rau txhawm rau kom hloov kho cov ntsuas kev nrawm. Nws siv cov yam ntxwv yog li nram no:
(1) Qhov loj tshaj plaws yog qhov yooj yim ntws ntawm, txoj kev poob qis me me, thiab qhov zoo tshaj plaws" tu tus kheej" kev ua tau zoo.
(2)" O" -shaped pob valve unimpeded kev kho kom haum. Kv tus nqi yog qhov loj tshaj plaws, feem ntau siv rau ob-ntu txiav ntawm cov xov xwm qias neeg.
(3) Lub" V" -shaped pob valve muab cov yam ntxwv hloov uas kwv yees logarithmic ntws yam ntxwv. Thaum lub" V" -shaped pob valve tig tus nqi txheeb rau lub rooj sib luag, nws tsim cov khoom siv shearing. Nws yog tshwj xeeb tshaj yog tsim nyog rau kev ua haujlwm siab, kev ncua, lub ntsws thiab lwm yam tsis huv thiab cov khoom siv fiber ntau. Kev hloov kho thiab txiav.
(4) Lub zog ntawm qhov tseem ceeb ntawm lub pob valve yog los thawb lub pob valve pob mus rau ib sab ntawm lub pob valve nyob rau hauv qhov kev txiav txim ntawm Δp. Lub zog quab yuam rau ntawm lub rooj sib tw valve nce qhov kev sib txhuam quab yuam thaum lub zog valve tig, yog li mainlyp feem ntau ua Ib hom kev sib txhuam, cov actuator tau yooj yim dua los kov yeej txoj kev sib txhuam no, uas yog, pob valve txiav tawm qhov siab qhov txawv yog loj dua.
(5) Lub pob kaw tshwj xeeb rau kev kho dej tuaj yeem siv rau cov ntawv tshaj tawm corrosive.
(6) Lub pob lub pob yog zoo li daim ntawv thov diaphragm ncig. Nws raug nquahu kom siv cov pob ntau dua thiab tsawg dua cov qub diaphragm (cov diaphragm yooj yim heev).
(7) Dhau heev thiab tsis ntseeg siab.
