Vavu yoyang'ana ndi mtundu wa valavu yomwe imatsegula ndi kutseka ndi mphamvu ya sing'anga yokha. Ma valve owunikira amagwiritsidwa ntchito makamaka kupewa kubwereranso kwa media. Pamene madzi akuyenda chammbuyo, valavu yoyendera imatseka. Ma valve owunikira nthawi zambiri amagawidwa kukhala ma valve okweza ndi ma valve oyendera.
Nyamulani Vavu Yoyang'ana (Globe Check Valve): Disiki yonyamula Check Valve nthawi zambiri imayenda pamzere woyima wapakati wa thupi la cheki valavu. Ma valve okweza macheke amatha kugawidwa m'mitundu yopingasa komanso yoyima. Valavu yokweza imapangidwa ndi thupi, boneti, tsinde, mpando ndi spool.
Swing check valve (pivotal check valve): Disiki ya swing check valve nthawi zambiri imazungulira pini kunja kwa mpando. Vavu yoyang'ana swing imatha kugawidwa m'mitundu itatu: valavu imodzi, valavu iwiri ndi valavu yambiri. Valavu yofunikira kwambiri imapangidwa ndi thupi, chivundikiro, shaft yozungulira ndi mbale yakuthwa.
Valavu yoyang'ana imagwira ntchito molingana ndi kusintha kwamphamvu kwamadzimadzi a raccoon palokha, ndikulepheretsa atolankhani kubwereranso kumbuyo. Amagwiritsidwa ntchito kwambiri pamapaipi operekera madzi.
Vavu yoyamwa pansi ndi mtundu wa valavu yoyendera. Valavu yokweza pansi imakhala ndi ntchito yabwino yosindikiza komanso phokoso lochepa. Nthawi zambiri amagwiritsidwa ntchito m'mapaipi opingasa okhala ndi mainchesi osakwana 200 mm. Ma valve a pansi pa swing suction nthawi zambiri amagwiritsidwa ntchito pamapaipi oyimirira kapena akulu akulu chifukwa chosasindikiza bwino komanso phokoso lalikulu. Vavu yoyamwa pansi imayikidwa kumapeto kwa chitoliro choyamwa cha mpope, ndipo imalumikizidwa ndi payipi ndi nthiti zamkati kapena flanges.