Uhlobo olujwayelekile oluvaliwe noma uhlobo olujwayelekile oluvulekile lungakhethwa ngokuya ngesikhathi sesikhathi esiqhubekayo sokusebenza.
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2. Isikhathi eside sokuvula nokuvala sobabili siyadingeka, ngaleyo ndlela sezenzele
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I-4 valve evamile ye-solenoid isetshenziswa ekusikeni okuphuthumayo Kepha, ngesinye isikhathi, i-solenoid valve ejwayelekile ayikwazi ukukhethwa, njengesithando somlilo kanye ne-kiln umlilo ukubheka umlilo,
