Kufotokozera Zamankhwala Valavu ya mpira pambuyo pa zaka zoposa theka la chitukuko, tsopano yakhala gulu lalikulu logwiritsidwa ntchito kwambiri.Ntchito yaikulu ya valavu ya mpira ndikudula ndi kulumikiza madzi mu payipi; Ikhoza kugwiritsidwanso ntchito poyendetsa madzi ndi control.Mpira valavu ili ndi makhalidwe ang'onoang'ono kukana, kusindikiza bwino, kusintha mofulumira ndi kudalirika kwakukulu. Vavu ya mpira imapangidwa makamaka ndi thupi la valavu, chivundikiro cha valve, tsinde la valve, mpira ndi mphete yosindikizira ndi mbali zina, ndi ...
Makhalidwe opangira mankhwala A valve cheke ndi valve "yodziwikiratu" yomwe imatsegulidwa kuti iyende pansi ndikutsekedwa kuti iwonongeke.Tsegulani valavu ndi kukakamizidwa kwa sing'anga mu dongosolo, ndi kutseka valavu pamene sing'anga ikuyenda chammbuyo.Ntchitoyi imasiyanasiyana ndi mtundu wa cheke valve mechanism.Mitundu yodziwika bwino ya ma check valves ndi kugwedezeka, kukweza (pulagi ndi mpira), butterfly, cheke, ndi tilting peduct mankhwala, ndi tilting peduct, ndi tilting disc. mankhwala, chemistry...