Kuyinto eqhelekileyo ukuva isandi xa uvula i-cylinder yegesi.
Irhasi, ngokuqhelekileyo kwimeko yegesi, icinezelwe kwi-cylinder ukuze incibilike. Ukuvula ivalve yesilinda kubangela ukuguqulwa kwale gesi engamanzi ibuyele kwimo yayo yegesi ngevalve yokunciphisa uxinzelelo., inkqubo eyenza ingxolo ngenxa yotshintsho loxinzelelo.
Ukongeza, njengoko igesi iphuma kwindawo yokuphuma, idala ukungqubana kunye nemibhobho yerhasi, okukhokelela kwingxolo efuthayo. Esi sandi sibonakala xa uvula isilinda segesi kwaye sichitha xa isilinda sivaliwe..