RALPH H STAPENELL
Real Estate Commission in Gardenville, PA

4454686, Jun 19, 1984

Sep 28, 1982

6/426002

Ralph H. Stapenell - Doylestown PA

E05C 1502

49141

A panel structure for mounting on any of various enclosures susceptible to explosions or excessive internal pressures, is formed as a self-contained unit mountable in sealing relation to a pressure-relief opening of the enclosure. Disclosed is a one-piece back plate with an integral mounting flange isolating all other frame components from the area in which a sealing function takes place. A peripheral seal on the closure panel exerts pressure against the back plate in a normal position of the closure panel, in a direction parallel to the lines along which internal pressure is exerted against the closure panel, thus providing an efficient seal about the entire periphery of the relief opening, without the necessity of precisely dimensioning the sealing gasket and frame components at the locations where they are interfaced for sealing engagement. The gasket includes side-by-side primary and secondary sealing beads, one of which projects forwardly a distance less than the other. Upon the application of excessive internal pressure, the closure panel moves linearly, initially breaking the primary seal while leaving the secondary seal functional for its intended purpose.