| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve lid adaptable to various valve main bodies.SOLUTION: A valve lid 70 comprises: a disk-like bottom portion 71; a cylindrical portion 72; and a protruding portion 73. The cylindrical portion 72 extends from a circumferential edge of the bottom portion 71 in a screwing direction, and female screws 75 are formed on an inner circumferential surface of the cylindrical portion 72. The protruding portion 73 includes first annular protrusions 73a and second annular protrusions 73b. In this case, the valve lid 70 having the male screws 75 on an inner circumferential surface is screwed into a valve main body 80 having male screws 80a on an outer circumferential surface, thus fitting the male screws 80a into the respective female screws 75. By this crewing, the first annular protrusions 73a and/or second annular protrusions 73b abut on a main body tip end 80b of the valve, thereby sealing the valve main body 80 with the valve lid 70. |
