Nominal Size Range:
3″ – 12″ (80 mm – 300 mm)
Burst Pressure Range:
Positive Pressure: 2 psig – 150 psig (0,138 barg – 10,3 barg)
Vacuum Pressure: 1 inWC – 115 inWC
Maximum Recommended Operating Ratio:
Maximum Recommended Operating Ratio: Consult CAL-VAC literature
Liquid or gas
BDI Alarm System Compatible?:
ASME Code Symbol Stamp Available?:
Two sides to the CAL-VAC rupture disc
As system vacuum approaches the burst pressure setting on the ultra-low vacuum side, a girdle is loaded until it deflects back past a knife blade assembly in the holder. As the girdle passes the knife blade, the seal is divided in a triangular pattern to relieve the vacuum.
On the higher-pressure side, the perforated metal top section, under tension loading, relieves pressure in the direction opposite the girdle. It incorporates CDC’s seven-hole pattern at the apex of the rupture disc dome. Together, the seven-hole pattern and six pre-cut sections create a non-fragmenting design.
Additionally, the top section’s pre-punched holes provide optimum flow through the disc when relieving ultra-low vacuum through the girdle.
CAL-VAC rupture discs vs. POS-A-SET rupture discs
The difference between the CAL-VAC and the POS-A-SET is the orientation of pressure relief components. The CAL-VAC relieves ultra low-pressure in the vacuum (negative) pressure direction, while the POS-A-SET Rupture Disc relieves ultra low-pressure in the positive pressure direction.