Ibice bya metering hamwe nisonga byacitsemo ibice, ukurikije buri kintu gisabwa peteroli, hitamo ibice bihuye nubushake hamwe na PV Urukurikirane rwubusa urashobora kuba urukurikirane rwubuntu kandi rusangira imikorere.imiterere: 1. High - igitutu cyamavuta yumuyoboro munini wamavuta asunika umutaka utandukanya peteroli kugirango uzamuke munsi yigitutu. . 3.Imiyoboro y'amavuta irangiye iyo Piston yimukiye muri apex yurugereko rwo hejuru. . Mu mpeshyi, Umbrella Valve isubirwamo kandi ikadodo inlet, na piston ikanda amavuta mu mwobo wo hepfo kugeza mu nzoka zo hejuru umwobo wa Mandrel, kandi itangwa rya peterori rikurikira naryo ryarabitswe.