Abstract: A rupture disk provides an improved scoring configuration that allows low pressure burst disks of very small diameter such as, for example, 0.25 inches in diameter, wherein the score of the rupture disk is generally circular in shape which terminates at end portions that define a hinge therebetween.

Abstract: A composite rupture disk includes a slit-slot, tension loaded disk having a plurality of circumferentially spaced radial slits (e.g. six in number) that terminate before reaching the disk center, thereby defining an uncut disk central portion which can be sized to at least partially influence the disk burst pressure. A radial strap, spot welded at each end attaches respectively at its end to the disk central portion and to the disk periphery, thereby preventing a downstream flow of the central portion upon rupture.

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.