| 摘要 |
<p>A deaeration valve comprising two valve films (11, 12) of synthetic resin that put one on the other, having an air passage (2) defined by two seal sections (21, 22) formed by means of bonding parts of the valve films together, wherein the inlet (2a) of the air passage (2) is defined by the straight line linking the respective upward flow side end sections (21a), (221a) of the seal sections (21, 22); the outlet (2b) of the air passage is defined by the straight line linking the respective downward flow side end sections (21b, 223b) of the seal sections (21, 22); and in at least one of the seal sections (21, 22), the valve films (11, 12) are not bonded together at the line of extension (21c, 223c) of the seal section (21, 22), situated on the downward flow side of the downward flow side end section (21b, 223b) of the seal section (21, 22).</p> |
