Uhlolojikelele I-valve yokulawula iyingxenye yokulawula ohlelweni lokudlulisa uketshezi, olunomsebenzi wokunqamula, ukulawula, ukuphambukisa, ukuvimbela ukugeleza emuva, ukuqina kwamandla kagesi, ukuphambukisa noma ukuchichima kanye nokukhulula ingcindezi. Ama-valve okulawula izimboni asetshenziswa kakhulu ekulawuleni inqubo ku-indi...
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