| 摘要 |
PURPOSE:To increase the mechanical strength and make a stable function possible by a method wherein a valve holding plate is made into a hat shape by an upper surface and outer peripheral wall surface and spring bearing lip. CONSTITUTION:A pressure adjusting valve body is a positivie/negative pressure valve which is composed of a valve body holding plate 5, valve body 6 and a negative pressure valve body 7. The valve body holding plate 5 is made into a hat shape by an upper surface 52 which has a communicating hole 51 at the center, an outer peripheral wall surface 53 and a spring bearing lip 54. The valve body 6 is held in the communicating hole on the valve body holding plate 5, and is made into large and small double disks which have an upward lip 61 on the outer periphery and a downward lip 62 on the inner periphery and a communicating hole 63 at the center. The negative pressure valve body 7 is made into an upside down dish shape with a downward lip on the outer periphery, of which diameter is larger than the downward lip 62 of the valve body 6, and the negative pressure valve body 7 is placed in a valve body bearing ring 16 which protrudes upward from a division plate 11 of an inner cap 2, and press-installed in the valve body 6 by an inner coil spring 8. By this method, the mechanical strength is increased, and a stable function can be obtained. |
