Valavu yotulutsa mpweya kawiri imagwiritsa ntchito kusintha kwa mavavu apamwamba ndi otsika nthawi zosiyanasiyana kuti nthawi zonse pakhale ma valve plate pakati pa zida zomwe zili zotsekedwa kuti mpweya usayende. Ngati ili pansi pa kupanikizika kwabwino, valavu yotseka mpweya iwiri ya pneumatic ingathandizenso kulinganiza ndikukweza kuyenda kwa valavu yolimbikitsira, kuti chipangizocho chizitha kugunda chakudya mosalekeza komanso kukhala ndi ntchito yotseka mpweya kuti ikwaniritse mphamvu ya pneumatic. Zofunikira pakunyamula ufa ndi zinthu zopangidwa ndi granular.

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