Abstract: A reverse-buckling rupture disk assembly provides a cylindrical housing having a bore for conveying flow through the housing. Removably mounted within the housing is a frangible concave-convex disk which is connected along its peripheral edge to the housing so as to form a closure to the bore. The housing can be disassembled and such disassembly allows removal and replacement of the disk. The disk is designed to resist pressure on the convex side up to a predetermined pressure and then collapsing after the predetermined pressure is reached. A knife blade is positioned within the housing bore on the concave side of the disk for perforating the disk when it collapses. The ends and center of the blade are removably connected to the inner surface of the housing so that the blade can be replaced after it wears or otherwise needs replacement. The knife blade is spaced from the inner surface of the housing at least along a substantial portion of its length. The knife blade can be serrated and is preferably curved.

Abstract: The present invention relates to methods of manufacturing scored concave-convex rupture disks wherein the disks are score after forming on the convex side, away from the pressure vessel or "process" of which the disk controls pressure so that product cannot build-up in the score and speed corrosion and/or alter burst pressure.

Abstract: A safety pressure relief device is provided for the venting of fluid pressure between first and second pressure zones. The relief device includes a first rupture disk having flexible sealing membrane located on one side thereof, and a knife means located on the other side of the first rupture disk. The first rupture disk includes a plurality of arcuate slots circumscribing a substantially circular blowout portion. The knife means includes a circular cutting blade located radially inward of the arcuate slots. Upon rupture of the first rupture disk, due to excess pressure in the second pressure zone, the substantially circular blowout portion passes through a circular opening in the knife means, allowing the flexible sealing membrane to contact the cutting blade and be severed thereby. Alternative embodiments add a second rupture disk to relieve excess fluid pressure from the first pressure zone to the second pressure zone.

Abstract: A safety pressure relief device is provided for the venting of fluid pressure between first and second pressure zones. The relief device includes a first rupture disk having a flexible sealing membrane located on one side thereof, and a knife means located on the other side of the first rupture disk. The first rupture disk includes a plurality of arcuate slots circumscribing a substantially circular blowout portion. The knife means includes a circular cutting blade located radially inward of the arcuate slots. Upon rupture of the first rupture disk, due to excess pressure in the second pressure zone, the substantially circular blowout portion passes through a circular opening in the knife means, allowing the flexible sealing membrane to contact the cutting blade and be severed thereby. Alternative embodiments add a second rupture disk to relieve excess fluid pressure from the first pressure zone to the second pressure zone.

Abstract: A safety pressure relief device including a rupture disk having a concave-convex portion and a radially outer flange portion joined by a curved transition connection. An improved knife means is located adjacent the concave side of said rupture disk, said knife means including a radially outer flange portion which supports said curved transition connection. A substantially circular inner opening is disposed in said knife means. Said knife means includes first and second spaced cutting means projecting radially inward into said opening and inclined towards said concave portion of said rupture disk. Said knife means further includes first and second arcuate non-cutting portions each partially defining said inner opening. The first cutting means is located between said first and second non-cutting portions so that upon reversal of said rupture disk said first and second cutting means will puncture said rupture disk without severing a portion of the disk therefrom.

Abstract: The present invention relates to a safety pressure relief apparatus comprised of a reverse buckling rupture disk having a concave-convex portion connected to an annular flat flange portion by a curved transition connection and a support member having an annular flat flange portion for engaging the annular flat flange portion of the rupture disk and for supporting the transition connection thereof. The support member includes a partially circular cutting edge positioned interiorly of the transition connection and forming, in conjunction with a non-cutting interior edge, an opening in the support member so that when the concave-convex portion of the rupture disk reverses itself, the cutting edge partially severs the disk whereby a portion thereof bends about an unsevered hinge portion and passes through the opening in the support member. The hinge portion of the rupture disk is supported by the non-cutting interior edge of the support member.