| 摘要 |
PROBLEM TO BE SOLVED: To improve valve function which can support contents of low viscosity in a check-valve fitted into a mouth of a squeezing tube for preventing air from flowing back by forming an outer diameter size of a valve body to be larger than an inner diameter size of a valve hole and bringing the valve body into overlapping contact with an upper face of a thick valve seat. SOLUTION: A check-valve 1 comprises a cylinder 5 formed on a lower part of a flange 4, while the cylinder 5 is formed with a thick part 6 protruding toward a center in a radial direction at its lower end and with a valve hole 8 at a center of the thick part 6. A valve body 9 extends from near an upper end of an inner periphery of the thick part 6, wherein the valve body 9 is coupled to the thick part 6 by a coupling 10. At this time, an outer diameter size of the valve body 9 is formed to be larger than an inner diameter size of the valve hole 8, and the valve body 9 is brought into contact with a valve seat 7 of the thick part 6 so that they overlap. This prevents the valve body 9 from being sucked into the valve hole 8 to be inverted when a tube container 2 has air flowing back, thereby reliably preventing air from flowing back into the tube container 2. |
