Valve ya mpira zopangidwa kuchokera ku valavu ya tambala, valavu ya mpira ndi gawo lonse monga valavu yotsegula ndi kutseka mbali (spool), pogwiritsa ntchito chigawo chozungulira kuzungulira kwa valve tsinde la 90 madigiri kuti akwaniritse cholinga chotsegula ndi kutseka valavu. Valavu ya mpira imagwiritsidwa ntchito makamaka kudula, kugawa ndikusintha komwe kumayendera sing'anga mupaipi. Vavu ya mpira yokhala ndi spool yotseguka yooneka ngati V imakhalanso ndi ntchito yabwino yoyendetsera kayendetsedwe kake.
Mavavu a mpira si ophweka popanga komanso abwino posindikiza, komanso kukula kwake kochepa, kulemera kwake, kuchepera pakugwiritsa ntchito zinthu zopangira, kuyika kukula kwazing'ono, kamphindi kakang'ono, kamphindi kakang'ono, kamene kamagwira ntchito mosavuta komanso kosavuta kuzindikira mwamsanga komanso kutsegula. kutseka. Iwo ndi amodzi mwa mitundu ya valve yomwe ikukula mwachangu m'zaka zaposachedwa. Kugwiritsiridwa ntchito kwa ma valves a mpira ndi kwakukulu kwambiri. Mitundu ndi kuchuluka kwa mavavu a mpira akuchulukirabe. Iwo akukula molunjika kutentha kwakukulu, kuthamanga kwakukulu, malo akuluakulu, kutsekedwa kwakukulu, moyo wautali wautumiki, machitidwe abwino kwambiri oyendetsera ntchito ndi ntchito zambiri. Kudalirika kwawo ndi ma index ena ogwira ntchito afika pamlingo wapamwamba, ndipo asintha pang'ono kugwiritsa ntchito ma valve a pachipata, ma valve a globe ndi ma throttle valves. Ndi chitukuko chosalekeza chaukadaulo wa valavu ya mpira, chidzagwiritsidwa ntchito kwambiri pakanthawi kochepa, makamaka m'mapaipi amafuta ndi gasi, magawo ophwanya mafuta ndi mafakitale anyukiliya. Kuonjezera apo, m'mafakitale ena akuluakulu ndi apakati, mabwalo apakati ndi otsika, ma valve a mpira adzakhalanso imodzi mwa mitundu yayikulu ya valve.