Nthawi zambiri tikhoza kuona zilembo kapena manambala pa thupi la valve, ndipo abwenzi omwe sadziwa valavu akhoza kusokonezeka ndi zilembo ndi manambala.Malingana ngati muphunzira kwa kanthawi, mudzapeza kuti zilembo ndi manambalawa ndi othandiza kwambiri.

Mwachitsanzo, pa valavu yachitsulo chosapanga dzimbiri, mawu akuti CF8 / CF8M nthawi zambiri amawoneka.Mawuwa amaimira zinthu za thupi la valve.CF8 / CF8M ndi miyezo yaku America.Zizindikiro zawo zazitsulo zapakhomo zimaponyedwa zitsulo zosapanga dzimbiri 304 ndi zitsulo zosapanga dzimbiri 316, ndi .Boma la China limafuna kuti valavu ya thupi (monga CF8 / CF8M), m'mimba mwake mwadzina (monga DN150 DN60), kuthamanga mwadzina (monga PN16, PN40), nambala ya ng'anjo yachitsulo (monga 7538), ndi zina zotero. kupatsa ogwiritsa ntchito chidziwitso cha ma valve ndi umboni wotsimikizira kuti ndi ndani, zomwe zimathandiza ogwiritsa ntchito kudziwa bwino kugwiritsa ntchito mavavu.