RA4 - Reverse Acting Rupture Disk

The RA4 reverse acting rupture disks (bursting discs) are designed to cover the majority of low pressure rupture disk (bursting disc) applications and are designed to be used in the RAH Pre-Torque holder.
RA4 Reverse Acting Rupture Disk


  • Operating ratios up to 95% of the low end of burst tolerance
  • Disk designs offer high cycle life (when compared to forward-acting design disks)
  • Certified for liquid, gas, or two-phase applications
  • Standard manufacturing ranges of 0%, -5%, and -10% ensures marked rating on disk tag does not exceed the MAWP of equipment
  • Withstands full vacuum without vacuum support
  • Wide range of standard and exotic materials available
  • Resists product build-up. The smooth convex side of the disk is exposed to the process media
  • Unique alignment pin design ensures proper disk orientation into RAH holder
  • 3-dimensional stainless steel tag permanently engraved with complete disk specifications
  • ASME UD, CE and TUV Compliance available
  • TFE liners are available to provide protection from corrosive media