Cheki valve (Check valve) zvinoreva vharafu inovhurika nekuvhara iyo vharafu zvichienderana nekuyerera kwepakati pachayo kudzivirira yepakati kuti isayerere kumashure.Inonziwo cheki valve, imwe-nzira valve, reverse flow valve, uye back pressure valve.Basa recheki valve ndiro
Ivhavha yekuongorora imhando yevhavha yega yega, basa rayo guru nderokudzivirira kuyerera kwemashure kwepakati, kudzivirira pombi uye motokari yemotokari kubva pakudzokera shure, uye kubudiswa kwemukati wemudziyo.Cheki inogona zvakare kushandiswa kugovera mapaipi ekubatsira masisitimu uko kudzvanywa kunogona kukwira pamusoro pekumanikidza system.
Kurongwa kwecheki mavharuvhu
Zvinoenderana nechimiro chayo uye nzira yekuisa, iyo cheki valve inogona kukamurwa kuita:

1. Swing cheki vharafu
Iyo dhisiki yevhavha yekutarisa-inotenderera ine disc-yakaita uye inotenderera yakatenderedza shaft yevhavha chigaro.Nokuti nzira iri muvharuvhu yakagadziridzwa, kuyerera kwekudzivirira kuduku pane iyo yevhavha yekuongorora.Inokodzera kuderera kwemazinga uye mavharuvhu asingadzoki.Zviitiko zvakakura zvedhayamita neanogara achichinja, asi asina kukodzera kupuruzira kuyerera, uye kuita kwayo yekuisa chisimbiso hakuna kunaka semhando yekusimudza.Swing cheki mavharuvhu akakamurwa kuva marudzi matatu: imwe vharafu, kaviri vharafu uye hafu vharafu.Aya marudzi matatu anonyanya kuiswa maererano nedhayamita yevharuvhu.Chinangwa ndechekudzivirira yepakati kumira kana kuyerera kumashure uye kuderedza iyo hydraulic shock.

2. Simudza cheki valve
A cheki vharuvhu iyo disc inotsvedza ichitevedza vertical centerline yemuviri wevharuvhu.Iyo yekusimudza cheki vharafu inogona kuiswa chete pahorizontal pombi, uye bhora rakatenderera rinogona kushandiswa kune yakafara disc pane yakakwira-kumanikidza diki-diameter cheki valve.Chimiro chemuviri wevhavha yevhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhavhamiswa zvakafanana nevhavha yekumisa (iyo inogona kushandiswa pamwe chete nevhavha yekumisa), saka mvura yayo yekudzivirira inokwana yakawanda.Chimiro chayo chakafanana nevhavha yekumisa, uye muviri wevhavha uye disc zvakafanana nevhavha yekumira.Chikamu chepamusoro chevhavha disc uye chikamu chezasi chechivharo chevhavha chinogadziriswa nemaoko ekutungamira.Iyo dhisiki inotungamira sleeve inogona kusimuka uye kudonha zvakasununguka muvhavhavhavha yevhavha yekutungamira maoko.Kana iyo yepakati ichiyerera ichidzika pasi, mavharuvhu discs anovhurwa nekusundirwa kwepakati.Kana iyo yepakati inomira, ma discs evharuvhu anotsamira ega Inowira pachigaro chevharuvhu kudzivirira yepakati kuti irege kuyerera kumashure.Iyo nzira yepakati pekupinda uye yekubuda mugero weiyo yakatwasuka-kuburikidza nekusimudza cheki cheki valve inotenderera kune iyo nzira yechigaro chevhavha chiteshi;iyo vertical lift cheki valve ine nzira imwechete yepakati inopinza uye yekubuda migero sevhavha yechigaro chevhavha, uye kuyerera kwayo kuramba idiki pane iyo yakatwasuka-kuburikidza nemhando.

3. Disc cheki vharafu
Vhuru ivharuvhu yecheki inotenderera ichitenderedza pini shaft iri pachigaro chevharuvhu.Iyo disc yekutarisa vharafu ine chimiro chakareruka uye inogona chete kuiswa pane yakatwasuka pombi, ine kusasimba kwekuisa chisimbiso kuita.

4. In-line check valve
Vhuru ivharuvhu inotsvedza ichitevedza mutsetse wepakati pemuviri wevharuvhu.In-line cheki vharafu rudzi rutsva rwevharuvhu.Idiki muhukuru, yakareruka muhuremu, uye yakanaka mukugadzira tekinoroji.Ndiyo imwe yenzira dzekusimudzira dzecheki mavharuvhu.Zvisinei, iyo coefficient yekudzivirira kwemvura yakakura zvishoma kudarika iyo ye swing check valve.
5. Compression check valve
Iri rudzi rwevharuvhu rinoshandiswa sevhavha yekudyisa mvura uye vharafu inovhara-vhavha, ine basa rakazara rekusimudza cheki vharafu uye yekumisa vharafu kana kona vharafu.