Lub ntsiab lus ntawm txoj kab uas hla Φ, txoj kab uas hla DN, nti cov specification units

Dab tsi yog ib nti ": Inch (") yog ib qho kev qhia tshwj xeeb ntawm American system, xws li steel kav, li qub, flanges, luj tshib, twj tso kua mis, tees, thiab lwm yam. Yog hais tias tus specification yog 10 ".

DN yog dab tsi: DN yog ib qho qauv siv feem ntau siv hauv Suav thiab European systems. Nws tseem yog cov lus qhia tshwj xeeb rau kev kos cov kav dej, li qub, flanges, fittings, thiab twj, xws li DN25.

DN yog hais txog lub nominal txoj kab uas hla ntawm cov yeeb nkab (tseem hu ua lub nominal txoj kab uas hla). Lus Cim: Qhov no tsis yog lub taub sab nraud lossis sab hauv. Nws yog qhov nruab nrab ntawm sab nraud thiab sab hauv txoj kab uas hla, uas yog hu ua qhov nruab nrab sab hauv txoj kab uas hla.

Dab tsi yog Φ: Φ yog ib lub universal unit, uas yog hais txog sab nraud txoj kab uas hla ntawm cov kav dej thiab / los yog lub luj tshib, round steel thiab lwm yam ntaub ntawv. Nws kuj tseem tuaj yeem hais tias yog txoj kab uas hla, xws li Φ609.6mm yog hais txog sab nraud ntawm 609.6mm.

"Inch" muaj tib lub ntsiab lus raws li DN daim ntawv lo, qhov tseem ceeb nws txhais tau tias lub nominal txoj kab uas hla, qhia qhov luaj li cas ntawm no specification, Φ yog ib tug ua ke ntawm ob.

Cov nti dav dav yog tus lej ncaj qha muab faib los ntawm 25 kom sib npaug DN, xws li 1 "* 25=DN25 2" * 25=50 4 "* 25=DN100, thiab lwm yam.

1/2 "= DN15 3/4"=DN20 1-1 / 4 "= DN32 1-1 / 2" {{11} } DN40