Patent ID: 8622089
Filing Date: 2014-01-07
Classification: B65D,F16K,Y10T

Abstract:
1. A check valve comprising a plurality of layered sheets to have a valve flow channel formed as a space for fluid passage between the plurality of layered sheets, said check valve allowing a fluid to pass in a forward direction from an inlet to an outlet and blocking a flow of a fluid in a reverse direction from the outlet to the inlet by opening and closing the valve flow channel, wherein the plurality of layered sheets include a plurality of base sheets including a first side base sheet and a second side base sheet; and at least one valve sheet disposed between the plurality of base sheets, the valve sheet includes a fixation portion bonded to at least the first side base sheet, the fixation portion is bonded across the valve flow channel, a portion on a downstream side of the fixation portion of the valve sheet is separable from the first side base sheet, and a portion between the valve sheet and the second side base sheet or another valve sheet layered on the valve sheet is formed as the valve flow channel, whereby the check valve blocks the flow of the fluid between an inside and an outside of a storage body through an opening provided on the storage body, and wherein an entire periphery of the check valve is bonded to the storage body by a storage body fixing seal, and an area from the inlet to the outlet through the valve flow channel is positioned within a region surrounded by the storage body fixing seal, the valve flow channel along an entire length of the valve sheet is defined by the second side base sheet or said another valve sheet layered on the valve sheet and the valve sheet without breathable sheets positioned therebetween, a fluid introduction recess recessed in a thickness direction is formed on at least one of the second side base sheet or said another valve sheet layered on the valve sheet constituting the valve flow channel and the valve sheet, and the fluid introduction recess is provided on the fixation portion of the valve sheet or at a position on the upstream side of the fixation portion, and extends in an up-down direction of the valve flow channel for guiding the fluid along the forward direction.