Valavu yodulira mpweya ya njira zitatu imaphatikizapo thupi la valve ziwiri, diski ziwiri za valve, mpando wa valve ziwiri, tee imodzi, ndi silinda inayi. Thupi la valve limagawidwa m'mabowo atatu A, B, ndi C omwe amalumikizidwa kunja ndi mpando wa valve plate. Zipangizo zotsekera zimayikidwa pakati pa thupi la valve ndi mpando wa valve plate. Mbale yodulira mpweya yomwe ili m'bowo imalumikizidwa ku silinda kudzera mu shaft yolumikizira. Mwa kusintha malo a valve plate, njira yoyendera mpweya mu payipi imatha kusinthidwa; Chifukwa cha kusinthana kwa kutentha kudzera mu thupi losungira kutentha, kutentha kwa valve yobwerera m'mbuyo kumakhala kochepa, ndipo palibe zofunikira zapadera pazinthu za valve yobwerera mmbuyo.

Komabe, chifukwa cha zofunikira pakupanga kosalekeza, valavu yobwerera m'mbuyo iyenera kuthana ndi kuwonongeka ndi kung'ambika komwe kumachitika chifukwa cha fumbi mu mpweya wotuluka komanso zotsatira zake zowononga. Zigawo zamakina ziyenera kuonetsetsa kuti kuwonongeka ndi kung'ambika komwe kumachitika chifukwa cha kusinthana pafupipafupi kwa zigawo, zomwe zafuna kudalirika kwambiri komanso nthawi yogwira ntchito.