FIELD: mining. SUBSTANCE: device has flexible air supply hose. Extension in the form of hollow body with cylindrical side surface and coming wider to the bottom portion, joined to bottom portion is secured to the hose end. Return valve in the form of a rod spring loaded to the bottom portion is installed on its inlet in the central hole of the extension. Isolating member is secured of the member. Outer surface of extension bottom portion looks like revolution ellipsoid. Internal surface of the bottom portion is conical. EFFECT: high efficiency. 2 dwg
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