Posankha ndi kugwiritsa ntchito mankhwala opangira ma valve, ndikofunikira kumvetsetsa bwino mfundo ya valve yowunikira kuti musankhe valavu yoyenera ndikuwonjezera moyo wake wautumiki. Mfundo yogwirira ntchito yachekeni valavu ili motere: valavu yowunikira imalola kuti madzi aziyenda kumalo enaake ndipo amalepheretsa madzimadzi kubwerera kumbuyo kapena mbali ina. Ma valve oyenerera ayenera kuyamba kutseka pamene kuthamanga kutsika mu chitoliro ndipo mphamvu ya kinetic yamadzimadzi imachepetsa. Pamene mayendedwe amadzimadzi akubwerera, valve yowunikira iyenera kutsekedwa kwathunthu.
