| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce variations in the opening shape and opening area of a pressure release valve.SOLUTION: A valve body 21 of a pressure release valve 20 has an intersection groove 23. The intersection groove 23 comprises straight grooves 24 and 25, and a recessed groove 26. The recessed groove 26 is provided in an area including a crossing P of virtual straight lines Y1 and Y2 along the straight grooves 24 and 25, and positioned in such a manner as to surround the crossing P. The recessed groove 26 has an opening width greater than opening widths of the straight grooves 24 and 25.</p> |
