A na-ejikọta valvụ ahụ site na otu ụzọ mkpọ, na nhazi ahụ siri ike.N'ihi mkpụmkpụ mmechi strok na ntinye mmiri na-acha odo odo, mmechi na-agba ọsọ na-adị ngwa ngwa, nke nwere ike ibelata ihe ngosi hama mmiri.The valvụ nwere àgwà nke obere olu, ìhè arọ, mmetụta mmetụta, a pụrụ ịdabere na akara, adaba echichi, wdg Enwere ike tinye ya horizontally ma ọ bụ kwụ ọtọ.