Valvụ eriri mkpọpu ala

Vọlfụ eriri ọkpọkọ na-egbochi mmiri ịgbapụta n'elu eriri ọkpọkọ ahụ mgbe mgbe ma ọ bụrụ na ọkpọkọ ahụ na-amalite site na obere ihe gbapụrụ n'ala. LANDRILL nwere ike inye valvụ nchekwa mepere emepe zuru oke (FOSV), valvụ Kelly, ihe mgbochi mgbapụta n'ime (IBOP), valvụ nlele drop-in, valvụ mmiri na-ese n'elu mmiri.