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.

Both designs:

• Relieve pressure as low as 1 inwc differential
• Are dual-acting, providing both both positive and negative pressure protection
• Can be made to meet 3A sanitary standards when used with a sanitary fitting holder assembly
• Provide lower maintenance costs and greater reliability compared to a valve, increasing your system productivity
• Do not include moving parts, eliminating the possibility of mechanical malfunction