I. Malingana ndi mphamvu 1. Vavu yodziyimira yokha: kudalira mphamvu yokha kuti igwiritse ntchito valve.Monga valavu yowunikira, valavu yochepetsera kuthamanga, valve ya msampha, valve yotetezera, ndi zina zotero.2. Valavu yoyendetsa galimoto: kudalira anthu, magetsi, hydraulic, pneumatic, ndi mphamvu zina zakunja kuti zigwiritse ntchito valve.Chotero...
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