Gawaarida kubbadda ee loo yaqaan 'Trunnion ball valves' waxay leeyihiin obturator oo ku xiran trunnion kaas oo ka hortagaya barakicinta axial ee kubbadda lafteeda ee jihada socodka;Cadaadiska xariiqda ayaa kursiga ku cadaadiya kubbadda, xidhiidhka ka dhexeeya dusha sare wuxuu abuuraa xidhitaanka valve;Dhismaha halbeegga trunnion wuxuu xaqiijiyaa gargaarka tooska ah ee daloolka haddii cadaadis xad dhaaf ah uu ku yimaado daloolka jirka;valves-yadan waxaa loo dooran karaa codsiyo kala duwan oo kala duwan oo aan xad gaar ah u lahayn dhammaan cabbirrada iyo cadaadiska.