I-lift check valve iyivalvu ezenzakalelayo evula futhi ivala i-disc yayo ngokuncika ekuhambeni komthombo uqobo ukuze kuvinjelwe ukubuyela emuva komthombo. Yaziwa nangokuthi i-non-return valve, i-one-way valve, i-reflux valve, noma i-backpressure valve.

Njengohlobo lwevalvu ezenzakalelayo, imisebenzi eyinhloko ye-check valve ihlanganisa ukuvimbela ukubuyela emuva komthombo, ukugwema ukujikeleza okuphambene kwamaphampu nemishini yawo yokushayela, kanye nokumisa ukuvuza komthombo ezitsheni zengcindezi. Ama-check valve angabuye afakwe kumapayipi okuhlinzeka ezinhlelweni ezisizayo lapho ingcindezi yangaphakathi ingakhuphuka ngaphezu kwengcindezi eyinhloko yohlelo.

Ama-check valve ahlukaniswa ngezigaba ezimbili eziyinhloko: ama-swing check valve (ajikeleza eduze kwesikhungo sawo samandla) nama-lift check valve (ahamba eduze komugqa ophakathi).