Inverted Type Rupture Disk

The INVERTED Type Graphite Rupture Disk (bursting disc) is the best choice for higher burst ratings.
Inverted Type Rupture Disk


  • Designed to fit ASME B16.5 Class 150 and 300 flanges
  • 0% manufacturing range
  • Flat surface of the disk contacts the process media
  • Operating pressures to 90% of the disk’s marked burst pressure (Contact ZOOK for operating ratio for burst pressures below 40 psig)
  • Temperature ratings –290°F to +700°F (–179°C to +371°C) Maximum temperature rating without insulation is 430°F (221°C) or 700°F (371°C) with insulation. Contact ZOOK for higher temperature ratings. The specified temperature shall be at the disk location at the time when the disk is expected to rupture
  • Stocked INVERTED Disks, ready for immediate shipment.
    • Sizes: 1", 1-1/2", 2", 3" to fit ASME B16.5 Class 300 flanges
    • Burst Ratings: 175, 200, 225, 250, 275, 300 psig @ 72°F (22°C)
    • Note: Sizes 6" and 8" ASME B16.5 Class 150 flanges with burst ratings 125, 150 psig @ 72°F (22°C) are stocked in INVERTED type
  • ASME B16.5 Class 300 disks are armored
  • ASME UD marking available