A na-eji valvụ nlele pilot na-egbochi cylinder n'akụkụ abụọ ahụ. Ọsọ ọsọ bụ n'efu n'otu ụzọ ma gbochie ya na ntụgharị ihu ruo mgbe etinyere nrụgide pilot. Ịkwanye ihu na-enyere aka mgbakọ ozugbo na cylinder.