Patent ID: 7708464

Claim:
A deaeration valve attached to a bag and comprising two valve films of synthetic resin that are placed one on the other and bonded at parts thereof together, thereby forming an air passage that allows to pass air through the valve films from an inlet to an outlet, the air passage being closable by the valve films that closely contact together, wherein the air passage is defined by two seal sections formed by bonding the valve films together, the inlet of the air passage being defined by a straight line linking respective upward flow side end sections of the seal sections, while the outlet of the air passage being defined by a straight line linking respective downward flow side end sections of the seal sections, the inlet being located on the downward flow side based on the direction of the air flow passing through the air passage against a storage section in the bag attaching the deaeration valve thereto, the storage section being able to contain an item for storage, and at least one of the downward flow side end sections of the seal sections and downward flow side edges of the valve films are separated, wherein the deaeration valve further comprises a non-sealed section comprising a passage extension section and a free section, the passage extension section being provided on the downward flow side of the air passage, the passage extension section being defined by the outlet of the air passage, a line of extension of the seal section on the downward flow side from at least one of the downward flow side end section of the seal sections, and the downward flow side edges of the valve films, the free section being adjacent to the passage extension section or to the air passage and the passage extension section, and further being partitioned not to allow air flow, except the air passage, from the storage section, the passage extension section and the free section being bounded by the line of extension that defines the passage extension section; wherein the valve films are not bonded together at the lines of extension.