DEAERATION VALVE FOR COMPRESSION BAG AND COMPRESSION BAG WITH DEAERATION VALVE

摘要

A deaeration valve for a compression bag comprising a base (2), a cover (3), and a valve element body (4). A deaeration port (22) allowing the inside of the compression bag to communicate with the outside is formed in the base (2). A cover side through hole (32) led to the inside of the cover (3) are formed in the upper surface of the cover (3). The valve body (4) is sucked toward the deaeration port (22) by a negative pressure in the compression bag to close the deaeration port (22). A pressing portion (33) protruding to press the valve body (4) is formed on the lower surface of the cover (3). A valve body housing chamber (S) is defined by the sidewall (24) and the diaphragm (21) of the base (2) and the lower end of the pressing portion (33) of the cover (3). At least part of the valve body (4) is disposed in the valve body housing chamber (S) in such a free state that it is not fixed to the base (2) or the cover (3) nor is not forced by an elastic member so that the valve body is vertically movable in the valve body housing chamber (S).