Automatic self-closing valve closure assembly for valve bags

A valve bag assembly comprising:

• a tubular bag body having a satchel-type bag end being a valve end having a valve side, an interior portion and an exterior surface, said valve side including an opening at said valve end for accommodation therein of a valve;
• and,
• a valve having:
• a valve tube disposed within the said opening of said valve side of the valve end and having a width smaller than said opening, the valve tube further having an inner opening, an outer opening, an interior surface and an exterior surface, the inner opening extending into the interior portion of said tubular bag body and the outer opening being substantially coterminous with the opening of said valve side of the tubular bag body, the outer opening being open outwardly of the exterior surface of said tubular bag body, said valve tube providing a channel through said opening of the valve side for passage into the interior portion of said valve bag for filling the bag and the valve tube being freely closeable upon filling the bag;
• and
• flap valve members having a seal lock layer and an offset layer, both layers having an inner edge, an outer edge and oppositely folding tab locks, the inner edge of said offset layer extends past the inner edge of said seal lock layer, said outer edges formed by folding said seal lock and offset layers to nest together thereat and form a bag-inward trapping collar to prevent product leaking around the valve tube, said outer edges being substantially coterminous with the outer opening of said valve tube, the seal lock and offset layers being disposed at said valve side with the tubular bag body opening and around the exterior surface of the said valve tube, the inner edge of said offset layer extending past the inner opening of said valve tube, said tab locks of both said seal lock and offset layers being folded over the valve tube a sufficient distance overlap forming a sleeve-like configuration, whereby said seal lock and offset layers accommodate the valve tube within the sleeve-like configuration, said sleeve-like configuration having a width substantially the same as the width of the opening of said valve side, said seal lock and offset layers forming flap valves at said satchel-type bag end for closing the bag-inward opening of the valve tube, thereby creating a flap valve closure action, which effects an automatic non-adhesively self-closing valve tube closure by sealing around and closing the valve tube and the opening of the valve side of the tubular bag body and forming a barrier to outward channeling of the bag contents through and around the valve tube during and after bag filling.