DN (Nominal Diameter) txhais tau hais tias lub nominal txoj kab uas hla ntawm cov yeeb nkab, uas yog qhov nruab nrab ntawm lub puab kab uas hla thiab lub puab txoj kab uas hla.Tus nqi ntawm DN = tus nqi ntawm De -0.5 * tus nqi ntawm lub raj phab ntsa thickness.Lus Cim: Qhov no tsis yog lub taub sab nraud lossis sab hauv.

Dej, roj xa hluav taws xob steel yeeb nkab (galvanized steel yeeb nkab lossis tsis-galvanized steel yeeb nkab), cam khwb cia hlau yeeb nkab, steel-yas composite yeeb nkab thiab polyvinyl chloride (PVC) yeeb nkab, thiab lwm yam., yuav tsum tau kos npe rau kab nominal "DN" (xws li DN15. , DN50).

De (External Diameter) txhais tau hais tias sab nraud txoj kab uas hla ntawm cov yeeb nkab, PPR, PE yeeb nkab, polypropylene yeeb nkab sab nraud txoj kab uas hla, feem ntau yog cim nrog De, thiab tag nrho cov yuav tsum tau cim raws li daim ntawv raws li lub txheej txoj kab uas hla * phab ntsa thickness, piv txwv li De25 × 3. .

D feem ntau yog hais txog lub puab txoj kab uas hla ntawm cov yeeb nkab.

d feem ntau yog hais txog sab hauv txoj kab uas hla ntawm cov yeeb nkab ua vaj tse.Reinforced qhob (los yog pob zeb) cov kav dej, cov kav dej av nplaum, cov kav dej ua kua qaub-resistant ceramic, cov vuas lub tog raj kheej thiab lwm cov kav dej, uas cov yeeb nkab txoj kab uas hla yuav tsum tau sawv cev los ntawm txoj kab uas hla d (xws li d230, d380, thiab lwm yam.)

Φ sawv cev txoj kab uas hla ntawm ib lub voj voog ntau;nws tuaj yeem sawv cev rau sab nraud ntawm cov yeeb nkab, tab sis lub sijhawm no nws yuav tsum tau muab faib ua phab ntsa tuab.