Magawo otsegulira ndi otseka a valve yoyimitsa ndi diski yofanana ndi plug, malo osindikizira ndi athyathyathya kapena a conical, ndipo diski imayenda molunjika pakati pa mzere wamadzimadzi. Maonekedwe a ndodo ya valve imaphatikizapo mtundu wa ndodo yonyamulira (ndodo ya valve imakwezedwa ndipo gudumu lamanja silinakwezedwe) ndi mtundu wa ndodo yokweza (mkono umazunguliridwa ndi kukwezedwa pamodzi ndi ndodo ya valve, ndipo mtedza umayikidwa. thupi la valve). Ntchito ya valve yoyimitsa imangogwiritsidwa ntchito potsegula ndi kutseka kwathunthu, ndipo sikuloledwa kulamulira ndi kugwedeza. Izi zimatsimikiziridwa makamaka ndi mawonekedwe a valve yoyimitsa, motere:
