| 摘要 |
A safety pressure relief device comprises an annular flange portion ( 22 ), a concave/convex dome portion ( 24 ) and a transition portion ( 26 ) between the flange portion ( 22 ) and the dome portion ( 24 ), the transition portion ( 26 ) comprising a linear extent ( 28 ) extending from the annular flange portion ( 22 ) at a first acute angle (theta<SUB>1</SUB>) to the plane of the flange portion ( 22 ), a tangent to the dome portion ( 24 ) at its junction with the transition portion ( 26 ) making a second acute angle (theta<SUB>2</SUB>) with the plane of the flange portion ( 22 ) which is greater than said first angle (theta<SUB>1</SUB>), a line of weakness being formed in and around part at least of the linear extent ( 28 ) of the transition portion ( 26 ).
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