| 摘要 |
Unitary one-piece frameless overpressure vent panel assembly ( 10 ) includes a rigid, generally planar primary support member having a central relief opening ( 26 ), a rigid, generally planar secondary support member ( 44 ) provided with a central relief aperture ( 46 ), and a frangible vent panel ( 30 ) between the support members in full closing relationship to the relief opening and the aperture. A sealant element ( 48 ) may be provided between the vent panel and at least one of the support members in circumscribing relationship to the relief opening or aperture. At least one line of weakness ( 34 ) may be provided in the vent panel. A flexible gasket ( 58 ) secured to the secondary support member assures a fluid tight seal between the vent panel assembly and the structure defining a protected zone. Alternatively, a knife blade or the like may be provided adjacent the vent panel to effect severing thereof under a predetermined overpressure in lieu of a line of weakness in the panel.
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