Phallo e lumelloa ho feta ka tsela e le 'ngoe (V1 ho C1 kapa V2 ho C2), joale valve e lula e koetsoe (e hlahlojoe) ka litsela tse peli tse ka morao (C1 ho V1 kapa C2 ho V2) e le ho tšoara le ho notlela sebakeng sa silinda kapa li-actuator tse ling; phallo e khutlelang morao e ka khoneha ha feela khatello e lekaneng ea mofofisi e sebelisoa ho V2 kapa V1, e sebetsang e le likou tsa lifofane tse hokahaneng, 'me piston ea mofofisi a phahamisa poppet setulong sa eona. ho hlola khatello ea li-cylinder port.
Ngola molaetsa wa hao mona mme o re romele wona