Ma valve amasiyanitsidwa ndi kuyendetsa, kugwiritsa ntchito ndi ntchito
Mavavu amasiyanitsidwa ndi kuyendetsa, kugwiritsa ntchito ndi ntchito ya York valavu, imapangidwa makamaka ndi thupi la valve, kutsegulira ndi kutseka zigawo ndi chivundikiro cha valve magawo atatu. Mpando wa valavu mu thupi la valavu, tsinde la valve limayendetsa mbali zotsegula ndi kutseka za valve (di...
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