| 主权项 |
1. A pressure relief device of domed construction adapted to vent contents of an internally pressurized container upon development of a pre-defined pressure within the container, the pressure relief device having a center and comprising:
a sloped sidewall including an outer annular segment and a sloped annular intermediate segment, the sloped annular intermediate segment having a width dimension greater than a width dimension of the outer annular segment; and a circular central plateau intersecting the sloped sidewall to define a concentric flat dome top of the pressure relief device, the circular central plateau having a center point disposed at the center of the pressure relief device and an arc shaped coin line extending about an arc, the arc having an apex with the apex of the arc positioned at the center point of the circular central plateau and wherein the arc shaped coin line has a depth providing a remaining opposing web of material with a thickness of not more than 0.007 inches, wherein the circular central plateau is formed from a piece of metal having a defined thickness, and wherein the thickness of the remaining opposing web of material is equal to the defined thickness of the piece of metal minus the depth of the arc shaped coin line, and wherein the pressure relief device is characterized by a venting pressure of not less than 380 psig and a dome reversal pressure of at least 50 psig greater than the venting pressure, wherein the arc shaped coin line is trapezoidal in transverse cross section, wherein the sloped annular intermediate segment has the width dimension at least 1.5 times greater than the width dimension of the outer annular segment and wherein the outer annular segment is concave in the width dimension. |
