Abstract: A deflation valve for a compression bag comprising a base 2, a cover 3, and a valve body 4, the base 2 serving as a deflation opening 22 that communicates the inside and outside of the bag, the cover being provided with a through hole 32 that leads to the inside of the cover, the valve body 4 being able to close the deflation hole 22 by being drawn toward the hole under negative pressure inside the compression bag, wherein a pressing portion 33 is formed underside of the cover 3 in order to press the valve body, and a valve housing chamber S is defined by the sidewall 24 and diaphragm 24 on the base 2 and the lower edge of the pressing portion 33 of the cover 3, while the valve body 4 is neither secured to the base 2 and the cover 3 nor pressed by any elastic member, but is disposed inside the valve hosing chamber S in a free state, whereby the valve body 4 is movable upward and downward in the chamber S.

Abstract: A deflation valve for a compression bag comprising a base 2, a cover 3, and a valve body 4, the base 2 serving as a deflation opening 22 that communicates the inside and outside of the bag, the cover being provided with a through hole 32 that leads to the inside of the cover, the valve body 4 being able to close the deflation hole 22 by being drawn toward the hole under negative pressure inside the compression bag, wherein a pressing portion 33 is formed underside of the cover 3 in order to press the valve body, and a valve housing chamber S is defined by the sidewall 24 and diaphragm 24 on the base 2 and the lower edge of the pressing portion 33 of the cover 3, while the valve body 4 is neither secured to the base 2 and the cover 3 nor pressed by any elastic member, but is disposed inside the valve hosing chamber S in a free state, whereby the valve body 4 is movable upward and downward in the chamber S.