I-valve ye-Fire Fight Rood Resed Resed Swing CheckVVVVE iyi-valve esezingeni eliphakeme eyenzelwe ngqo izinhlelo zokuvikela umlilo. Kwenziwa ngezinto ezihlala isikhathi eside ukuze kuqinisekiswe ukusebenza okuhlala isikhathi eside nokwethembeka.