Lub pob valve tshwm sim tom qab Tsov Rog Thoob Ntiaj Teb Zaum Ob. Txawm hais tias kev tsim lub pob valve pib txij li thaum pib ntawm lub xyoo pua 20th, daim ntawv pov thawj tsim qauv no tsis tau ua tiav nws cov kauj ruam kev lag luam vim muaj kev txwv hauv kev lag luam khoom siv thiab kev lag luam ua khoom siv. DuPont hauv Tebchaws Meskas tau tsim cov khoom siv polymer polytetrafluoroethylene (PTFE) yas siab txog xyoo 1943. Hom khoom siv no muaj qhov zoo ntawm lub zog tensile thiab compressive txaus, qee qhov elastoplasticity, cov khoom zoo self-lubricating thiab kev tiv thaiv corrosion zoo heev, uas yog qhov tsim nyog heev ua cov khoom siv sealing thiab muaj cov nyhuv sealing txhim khu kev qha heev. Tsis tas li ntawd, lub pob nrog lub voj voog siab thiab qhov chaw tiav zoo tuaj yeem tsim ua tus tswv cuab kaw ntawm lub pob valve vim yog kev tsim cov tshuab sib tsoo pob. Ib hom tshiab ntawm lub valve nrog lub qhov puv thiab 90 ° rotatory angular mus ncig nkag mus rau hauv kev lag luam valve, kos ntau xim. Cov khoom siv qub xws li cov khoom siv nres, cov khoom siv rooj vag, cov khoom siv ntsaws thiab cov khoom siv npauj npaim maj mam hloov los ntawm cov khoom siv pob, thiab cov khoom siv pob tau siv ntau heev, txij li cov kab uas me mus rau cov kab uas loj, qhov siab qis mus rau qhov siab siab, qhov kub ib txwm mus rau qhov kub siab, qhov kub siab mus rau qhov kub qis. Tam sim no, qhov siab tshaj plaws ntawm lub pob valve tau mus txog 60 nti, thiab qhov kub qis tshaj plaws tuaj yeem mus txog qhov kub ntawm cov kua hydrogen -254 ℃. Qhov kub siab tshaj plaws tuaj yeem mus txog ntawm 850 txog 900 ℃. Tag nrho cov no ua rau cov khoom siv pob haum rau txhua yam xov xwm, uas dhau los ua hom khoom siv zoo tshaj plaws.

Lub pob li qub tuaj yeem muab faib ua cov pob li qub ntab thiab cov pob trunnion raws li cov qauv.

Cov pob valve muaj peev xwm muab faib ua cov pob valve nkag sab saud thiab cov pob valve nkag sab. Cov pob valve nkag sab kuj tseem tuaj yeem muab faib ua ib daim pob valve, ob daim pob valve thiab peb daim pob valve raws li cov qauv ntawm lub cev valve. Lub cev valve ntawm ib daim pob valve yog ib qho tseem ceeb; ob daim pob valve muaj cov lub cev valve tseem ceeb thiab cov lub cev valve pab txhawb nqa thiab peb daim pob valve muaj ib lub cev valve tseem ceeb thiab ob lub cev valve pab txhawb nqa.

Raws li cov khoom siv kaw ntawm lub pob valve, cov pob valve tuaj yeem muab faib ua cov pob valve mos thiab cov pob valve tawv. Cov khoom siv kaw ntawm cov pob valve mos yog cov khoom siv polymer siab xws li polytetrafluoroethylene (PTFE), polytetrafluoroethylene uas muaj zog thiab nylon nrog rau roj hmab. Cov khoom siv kaw ntawm cov pob valve tawv yog hlau.