PRESSURE ACCUMULATOR

PURPOSE: To prevent entering of metal chips inside a pressure accumulator through a screw mechanism by providing a second division and a second guide surface to cover a sealing member before a screw is engaged on first and second members of a casing to be assembled by the screw mechanism. CONSTITUTION: A first division 11, a second division 13, a third division 14 and a fourth division 15 furnished with a sealing member 12 are provided on a first member 1 of a casing, a first guide surface 19 and a second guide surface 22 are provided on a second member 2, and it is devised so that the second guide surface covers the second division 13 before a internal thread 21 and external thread 20 of the both members 1, 2 make contact with each other. Consequently, as screw mechanisms of the both members 1, 2 first make contact with each other at the time when the sealing member 12 and a pressure accumulator 5 are shielded from the thread mechanisms at the time of assembling the two members 1, 2, the sealing member 12 is never broken, and it is possible to prevent bringing of metal chips into the inside of the pressure accumulator 5.