Chovala chowunikira ndikudalira kuthamanga kwa sing'anga yokha ndikutsegula ndi kutseka valavu ya valve, yomwe imagwiritsidwa ntchito pofuna kuteteza valavu yobwerera kumbuyo, yomwe imadziwikanso kuti check valve, valve ya njira imodzi, valve countercurrent, ndi valve back pressure.Check vavu kanthu Chongani valavu ndi mtundu wa basi va ...
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