I-DN, i-intshi, Φ iikhonsepthi ezintathu kunye nomahluko kwishishini levalvu

Kwimibhobho yofakelo lwemibhobho yofakelo iimpompo kunye nolunye uyilo okanye ukuthengwa sihlala sidibana ne-DN, i-intshi ", Φ kunye nezinye iiyunithi, kukho abahlobo abaninzi (ingakumbi abaninzi abatsha kwizihlangu zeshishini) kule babhidekile, abakwazi ukwahlula imodeli, namhlanje thina iya kushwankathela isishwankathelo seeyunithi ezintathu zohlalutyo oluthile lwesithili.

1.DN
"DN" abahlobo abaninzi ngempazamo bacinga ukuba yi-diameter engaphakathi, eneneni i-DN kunye nobubanzi bangaphakathi bokufutshane, kodwa kufutshane kuphela, intsingiselo yayo yokwenyani ngumbhobho, umbhobho, izifakelo zedayamitha yegama, idiameter yegama (Nominal Diameter), eyaziwa ngokuba I-avareji yangaphandle yedayamitha (Mean Outside Diameter), eneneni, iphantse ibe yi-avareji ngaphandle kwedayamitha.

Kwixabiso le-DN yasekhaya ngokusisiseko lixhaphake kakhulu, kodwa kumbhobho, izixhobo zombhobho kunye nevalve zingamela kuphela inxalenye, kutheni inxalenye yayo?Kuba kwinkqubo yemibhobho yasekhaya, kunokubakho iindidi ezimbini zedayamitha yangaphandle kumbhobho ofanayo ophawulweyo we-DN (Φ yidayamitha yangaphandle yombhobho okanye umbhobho, siya kuchaza kamva), njenge-DN100, kukho uthotho lwe-I kunye nochungechunge lwe-II (kwakhona. luncedo ukuphawula uthotho lwe-A kunye no-B series), I-series kunye no-A series ye-DN100 yi-Φ114.3, ngelixa i-II series kunye ne-B series ye-DN100 yi-Φ108.Ukuba awukhankanyi i-diameter yangaphandle yombhobho Φ emva kwe-DN xa unikezela isicwangciso kunye neenkcukacha, kufuneka uyenze icace ukuba ingaba i-I series (A series) okanye i-II series (B series) xa imakisha nge-DN, ukuze icacile kwinkqubo yokuthenga kunye nokubuza, kwaye unokwazi ukuba luhlobo luni lombhobho okanye ukufakwa ngaphandle kwedayimitha oyifunayo ngaphandle kokunxibelelana kunye nokuqinisekiswa.

ii-intshi ezi-2
I-intshi” yiyunithi yobukhosi, esetyenziswa kakhulu eMelika naseYurophu, ikwayiyunithi, ngokuqinisekileyo, inombhobho wePipe kunye neTube, namhlanje siza kucacisa udidi lwePipe yemibhobho kunye nokufakelwa, kamva iya kwazisa, iPipe pipe kunye neTube. umbhobho umahluko othile.

Kumbhobho wombhobho, i-intshi ayifani neyunithi ye-DN ukwahlula i-diameter yangaphandle yeentlobo ezimbini zemibhobho, yiyunithi ecacileyo, efana ne-4″ icaciswe ngokucacileyo yi-diameter yangaphandle 114.3, kunye ne-10″ yi-Φ273, ukuba nje umbhobho okanye izixhobo ezichazwe nge-intshi zingaziwa ngokucacileyo ngaphandle kokuqinisekiswa kombhobho ofunekayo ubungakanani bedayamitha yangaphandle.

3. Ububanzi Φ
Isimboli sedayamitha ngu-“Φ”, eyenobumba wesiGrike, obizwa ngokuthi “fai”, kwaye inobudlelwane obusondeleleneyo nezimbini zangaphambili, kuba inokutshintsha ezi yunithi zimbini zokuchonga, kunye nombhobho okanye umbhobho usebenzisa i-Φ yeyona icacileyo, kwaye iyeyona ingqalileyo ngaphandle koguqulo, njenge Φ219, Φ508, Φ1020, njl.njl. Le ndlela yokuchonga ikwayiyo ebanzi ngakumbi.