CHECK VALVE, ADOPTER, AND COMPRESSION BAG

摘要

A check valve capable of easily discharging air, having excellent check effect, and formed in a simple structure. The check valve formed to allow the discharge of the air to the outside and stop the entry of the air thereinto comprises a base plate (2) having a valve port (1) and a rubber valve (3) having a seal surface (3c) at its peripheral edge part (3a) formed in a thin wall shape and fitted to the base plate (2) so as to cover the valve port (1). When the base plate (2) is fitted to the peripheral edge of a valve opening (5) in such a state that the valve port (1) is aligned with the valve opening (5) formed in a sealable bag body (4), the peripheral edge part (5a) of the valve opening (5) of the bag body (4) is interposed between the seal surface (3c) of the rubber valve (3) and the base plate (2), and the seal surface (3c) is fitted to the peripheral edge part (5a) of the valve opening (5) of the bag body (4) to stop the inflow of the air from the outside into the bag body (4).