Patent ID: 7325574

Claim:
A removable rupture disc assembly for a pneumatic plug having an end casting with a threaded aperture, said removable rupture disc assembly comprising: a) a separable rupture disc holder structure having a two-part body structure comprising a cylindrical flanged body with a formed top portion having an internally threaded cavity with an annular seat, said top portion of said cylindrical flanged body having an elongated threaded end extending therefrom for threading into the aperture in the end casting of the pneumatic plug, and a cooperating externally threaded body to engage said internally threaded cavity, said flanged holder body and said cooperating threaded body each having aligned bores extending therethrough; b) a rupturable disc member having a U-shaped cross-sectional configuration and being positioned on said annular seat in said flanged holder body, said rupturable disc member being constructed and arranged to burst at a predetermined pressure and to provide a sufficient volumetric airflow for pressure relief from the pneumatic plug; and c) an O-ring positioned between said rupturable disc member and said annular seat of said flanged portion of said flanged holder body.