Ponena za ntchito yosavuta yodulira, ntchito yotsekera valavu mumakina ndikuletsa kuti cholumikiziracho chisatuluke kapena kutsekereza zinthu zakunja kuti zisalowe mkati mwa cholumikizira pakati pa zigawo zomwe zili m'bowo momwe valavu ili. Kolala ndi zigawo zomwe zimagwira ntchito yotsekera zimatchedwa zisindikizo kapena zomangamanga zotsekera, zomwe zimatchedwa zisindikizo mwachidule. Malo omwe amakhudzana ndi zisindikizo ndikuchita ntchito yotsekera amatchedwa malo otsekera.

Malo otsekera a valavu ndiye gawo lalikulu la valavu, ndipo mawonekedwe ake otayikira amatha kugawidwa m'mitundu iyi, yomwe ndi kutuluka kwa malo otsekera, kutuluka kwa cholumikizira cha mphete yotsekera, kutuluka kwa gawo lotsekera ndi kutuluka kwa zinthu zakunja zomwe zili pakati pa malo otsekera. Limodzi mwa ma valavu omwe amagwiritsidwa ntchito kwambiri mu mapaipi ndi zida ndikudula kuyenda kwa sing'anga. Chifukwa chake, kulimba kwake ndiye chinthu chachikulu chodziwira ngati kutuluka kwamkati kumachitika. Malo otsekera a valavu nthawi zambiri amakhala ndi awiriawiri otsekera, limodzi pa thupi la valavu ndi lina pa diski ya valavu.