Lub Wafer Npauj Npaim Valve thiab Flange Npauj Npaim Valve yog ob qhov kev sib txuas. Hais txog tus nqi, hom Wafer kuj pheej yig dua, tus nqi yog kwv yees li 2/3 ntawm Flange. Yog tias koj xav xaiv lub pob valve, kom deb li deb tau nrog hom Wafer, tus nqi pheej yig, lub teeb yuag. Qhov ntev ntawm ...
Nyeem ntxiv