CAL-VAC® Rupture Disc
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.
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.
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
- 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
- Seating Configuration: Flat seat
- Service: Liquid or gas
- BDI Alarm System Compatible?: Yes
- ASME Code Symbol Stamp Available?: No
Materials not indicated or shown may be available by special design.
Food & Beverage Processing
We understand that product purity and safety are critical in food-related industries, so we provide hygienic and aseptic vessels and piping to assure compliance with FDA and 3A requirements.
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POS-A-SET® Rupture Disc
Relieve ultra-low vacuum or positive pressure conditions with the highly accurate, bidirectional POS-A-SET rupture disc. Our double-acting design allows the POS-A-SET to do the work of two rupture discs with just one installation point. It relieves low positive pressure (as low as 1 inwc) with a girdle and knife-blade assembly on one side, while slightly higher negative pressure is relieved from the other side with perforations and a pre-cut section. Looking for the CAL-VAC rupture disc? Nearly identical to the POS-A-SET rupture disc, the CAL-VAC relieves ultra low-pressure in the negative direction – the inverse of the POS-A-SET’s ultra-low relief in the positive direction. -
WMP Welded Muffled Plug Rupture Disc Assembly
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