Raws li qhov sib txawv ntawm qhov txias thiab cua sov, daim duab peb sab valve tau muab faib ua ob hom:&"txias &"; thiab" kub" (txheeb xyuas los ntawm cov cim xiav thiab liab). Feem ntau ntawm cov khoom siv cua sov thiab cua txias daim duab peb sab li qub hauv cov qauv zoo ib yam, thiab tsis muaj qhov sib txawv tseem ceeb. Lub hom phiaj tseem ceeb ntawm qhov txawv ntawm qhov txias thiab sov yog: Cov cim kub thiab txias yog siv los cais qhov twg yog dej kub thiab dej txias. Tsuas yog qee qhov qis-qis qeeb-qhib daim duab peb sab li qub yog cov nplhaib roj hmab. Cov khoom siv roj hmab tsis tuaj yeem tiv taus 90 degree dej kub thiab yuav tsum tau muab faib ua kub thiab txias. Daim duab peb sab valve tau muab faib ua ob hom raws li hom qhib:&"qhib sai"&"; thiab" qhib qeeb". Kev qhib nrawm yog hais txog kev qhib nrawm thiab kaw lub valve ntawm 90 degrees. Qhib qeeb yog hais txog 360-degree tsis-nres kev sib hloov ntawm lub kaum sab xis valve kom qhib thiab kaw lub valve. Tam sim no yeej siv qhib sai. Qhov loj ntawm daim duab peb sab valve: 3/8 txhais tau tias 3 cov ntsiab lus, uas tuaj yeem txuas nrog rau 3-point dej yeeb nkab (feem ntau yog siv rau 3-point nyuaj yeeb nkab ntawm lub qhov dej nkag). 1/2 hais txog 4 cov ntsiab lus, uas tuaj yeem txuas nrog 4 cov ntsiab lus ntawm cov kav dej (feem ntau yog siv rau cov kais dej, chav dej, 4-taw tes tso cua sov, chav da dej, chav da dej thiab chav da dej, uas feem ntau siv hauv tsev neeg, thiab 1 /2) 3/4 (lub qhov ncaj) hais txog 6-point dej yeeb nkab uas tuaj yeem txuas nrog 6-point dej yeeb nkab (6-point right-angle triangle triangle valve tsis tshua muaj siv hauv tsev neeg.
Cov voos voos peb sab hauv kev txhim kho hauv tsev: lub valve rau lub thoob dej hauv qab chav dej, lub rhaub dej, chav dej hauv chav ua noj, tso dej tso quav tso quav, tso dej tso quav tso quav, thiab tso cov yeeb nkab zais hauv phab ntsa, uas feem ntau yog ntsaws ua ntej Txhawm rau tshem tawm lub ntsaws, koj yuav tsum tau teeb tsa daim duab peb sab. Feem ntau, cov tsev neeg uas siv cov dej nkag zais cia xav tau peb txog tsib.