N'ebe a na-eme ngwa ngwa nke ụlọ ọrụ mmepụta ihe taa, ntụkwasị obi na ịdịte aka bụ isi ihe na-ebute ụlọ ọrụ.Anyị ghọtara nke ahụ wee mee ka valvụ anyị na-egbutu elu ụwa.N'ilekwasị anya na ịdịte aka, nkenke na ntụgharị, valves anyị na-ekwe nkwa ịgbanwe usoro njikwa usoro mmepụta ihe.