Inverted - Graphite Disks


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


  • The best choice for higher burst ratings
  • Fail-Safe Design: If the disk is damaged or incorrectly installed, it will always burst at or below the marked burst rating
  • Designed to fit industry standard flanges ASME B16.5, ISO and JIS
  • Burst ratings 0.25 psig (0.02 barg) to 1,000 psig (68.95 barg) or higher
  • 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.
    1. Sizes: 1″, 1-1/2″, 2″, 3″ to fit ASME B16.5 Class 300 flanges
    2. Burst Ratings: 175, 200, 225, 250, 275, 300 psig @ 72°F (22°C)
    3. 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
  • All flange group 2 disks are armored
  • ASME (UD) and PED (CE) compliance available