Lub 90 degree ob lub qhov (socket) khoov yog khoov los ntawm kev siv tag nrho cov khoom siv khoov, uas tau muab faib ua ob txoj haujlwm: txias simmer thiab kub thawb. Tsis muaj teeb meem dab tsi ntawm cov tshuab, cov cuab yeej siv thiab cov kav dej siv, feem ntau yog siv ob lub qhov (socket) khoov ntawm 90 degree, uas yog siv rau cov roj, roj, infusion, engineering thiab choj, thiab lwm yam.
Lub deformation degree ntawm cov kav dej nyob ntawm tus nqi ntawm tus txheeb ze dabtsi yog khoov vojvoog R / D thiab tus txheeb ze thickness t / D. Qhov me dua tus nqi ntawm R / D thiab t / D, qhov ntau dua qhov deformation degree. Txhawm rau kom ntseeg tau tias kev tsim cov yeeb nkab fittings zoo, qhov deformation degree yuav tsum tau tswj nyob rau hauv qhov kev tso cai. Txoj kev khoov ntawm cov yeeb nkab fittings nyob ntawm tsis yog tsuas yog cov khoom siv kho tshuab thiab khoov txoj kev ntawm cov ntaub ntawv, tab sis kuj yog nyob ntawm kev siv cov yeeb nkab fittings. Kev tsim cov yeeb nkab fittings yuav tsum muaj cov ntsiab lus hauv qab no:
(1) Lub elongation deformation nyob rau hauv lub tensile deformation cheeb tsam sab nraum lub nruab nrab txheej tsis tshaj cov yas tso cai tus nqi ntawm cov khoom, ua rau tawg;
(2) Nyob rau hauv lub compression deformation cheeb tsam ntawm sab hauv ntawm lub nruab nrab txheej, nyias-walled qauv nyob rau hauv qhov kev txiav txim ntawm tangential compressive kev nyuaj siab yuav tsis wrinkle tshaj lub buckling;
(3) Yog hais tias cov yeeb nkab fittings muaj ovality yuav tsum tau, tswj qhov distortion ntawm nws seem;
(4) Yog tias cov yeeb nkab fittings muaj lub zog yuav tsum tau ua rau lub siab sab hauv, kev tsim cov phab ntsa tuab yuav tsum tau tswj.
