Lapho ufaka ama-valve, kuthathwa izinyathelo ezihlukahlukene zokuqapha ohlelweni lobunjiniyela kanye nohlobo lwe-valve ukuqinisekisa ukuphepha. Izinyathelo ezilandelayo zokuzivikela zinconywa nge-valve yokuhlola, i-valve yokuphepha, i-valve yokulawula ukucindezela, nokufakwa kwesicupho se-steam ukuqinisekisa ukusebenza kahle kwe-valve. 1. Bheka...
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