Double-acting rupture disc CAL-VAC®

flat seatmetalultra-low-pressure

Relieve ultra-low vacuum or positive pressure conditions with the highly accurate, bidirectional CAL-VAC rupture disc. Our double-acting design allows the CAL-VAC to do the work of two rupture discs with just one installation point. It relieves low vacuum pressure (as low as 1 inwc) on one side, while slightly higher pressure is relieved from the other. The CAL-VAC’s easy-to-clean flat seat design reduces product buildup, making it easier to meet FDA requirements. Looking for the POS-A-SET rupture disc? Nearly identical to the CAL-VAC rupture disc, the POS-A-SET relieves ultra-low pressure in the positive direction – the inverse of the CAL-VAC’s ultra-low relief in the negative direction. Contact us if you aren’t sure which you need. 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.