Ib qho kev tshawb nrhiav hauv internet ceev rau lub valve yuav nthuav tawm ntau yam txiaj ntsig: phau ntawv lossis tsis siv neeg, tooj dag lossis stainless hlau, flanged lossis NPT, ib thooj, ob lossis peb daim, thiab lwm yam. Nrog ntau ntau hom li qub xaiv los ntawm, koj yuav ua li cas thiaj paub tseeb tias koj tab tom yuav hom zoo? Thaum koj daim ntawv thov yuav pab qhia koj hauv kev xaiv lub valve, nws yog ib qho tseem ceeb kom muaj qee qhov kev nkag siab yooj yim ntawm ntau hom li qub.

Lub pob valve ib-thooj muaj lub cev cam khwb cia uas txo qhov kev pheej hmoo ntawm kev xau. Lawv pheej yig thiab feem ntau tsis kho.

Ob-thooj pob li qub yog qee qhov feem ntau sivpob li qub. Raws li lub npe qhia, ob lub pob valve muaj ob daim, ib daim nrog ib daim txuas ntawm ib kawg thiab lub valve lub cev. Cov khoom thib ob haum rau thawj daim, tuav lub trim nyob rau hauv qhov chaw thiab suav nrog qhov kawg txuas thib ob. Thaum ntsia, cov valve feem ntau tsis tuaj yeem kho tshwj tsis yog tias lawv raug tshem tawm ntawm kev pabcuam.

Ib zaug ntxiv, raws li lub npe qhia, peb lub pob valve muaj peb ntu: ob lub kaus mom kawg thiab lub cev. Cov kaus mom kawg yog feem ntau threaded lossis welded rau cov yeeb nkab, thiab lub cev feem tuaj yeem tshem tau yooj yim rau kev ntxuav lossis kho yam tsis tau tshem lub hau kawg. Qhov no tuaj yeem yog qhov kev xaiv tseem ceeb heev vim nws tiv thaiv cov kab ntau lawm los ntawm kev kaw thaum yuav tsum tau saib xyuas.

Los ntawm kev sib piv cov yam ntxwv ntawm txhua lub valve nrog koj daim ntawv thov, koj yuav muaj peev xwm txiav txim siab uas zoo tshaj plaws rau koj cov kev xav tau. Mus ntsib peb lub vev xaib valve kom paub txog peb cov khoom siv pob valve lossis pib teeb tsa hnub no.

UV raug
DawbPVC yeeb nkab,hom siv rau cov kav dej, tawg thaum raug UV teeb, ib yam li los ntawm lub hnub. Qhov no ua rau cov khoom siv tsis zoo rau kev siv sab nraum zoov uas nws yuav tsis raug them, xws li flagpoles thiab daim ntaub ntawv vov tsev. Nyob rau tib lub sijhawm, UV raug txo qis qhov hloov pauv ntawm cov khoom siv los ntawm cov khoom siv polymer degradation, uas tuaj yeem ua rau tawg, tawg, thiab tawg.

kub kub
Raws li qhov kub thiab txias, PVC ua ntau thiab nkig. Thaum raug rau qhov txias txias rau lub sijhawm ntev, nws ua nkig thiab tawg yooj yim. PVC tsis haum rau cov ntawv thov uas muaj qhov kub thiab txias, thiab dej yuav tsum tsis txhob khov rau hauvPVC cov kav dejvim nws tuaj yeem ua rau tawg thiab tawg.

hnub nyoog
Tag nrho cov polymers lossis plastics degrade mus rau qee lub sijhawm dhau sijhawm. Nws yog ib yam khoom ntawm lawv cov tshuaj muaj pes tsawg leeg. Thaum lub sij hawm, PVC absorbs cov ntaub ntawv hu ua plasticizers. Plasticizers tau ntxiv rau PVC thaum lub sij hawm tsim khoom los ua kom nws yooj yim dua. Thaum lawv tsiv tawm ntawm cov kav dej PVC, cov kav dej tsis yog tsuas yog hloov tau yooj yim vim lawv tsis muaj, tab sis kuj tseem tshuav qhov tsis xws luag vim tsis muaj plasticizer molecules, uas tuaj yeem tsim cov kab nrib pleb lossis tawg hauv cov kav dej.

raug tshuaj lom neeg
Cov kav dej PVC tuaj yeem ua nkig los ntawm kev raug tshuaj lom neeg. Raws li cov khoom siv polymer, cov tshuaj muaj peev xwm muaj qhov cuam tshuam tsis zoo rau cov pleev ntawm PVC, loosening bonds ntawm molecules nyob rau hauv cov yas thiab ua kom ceev cov migration ntawm plasticizers tawm ntawm cov kav dej. Cov kav dej PVC tuaj yeem ua nkig yog tias raug cov tshuaj lom neeg ntau, xws li cov uas pom hauv cov kua dej ntsaws ntsaws.