CAL-VAC® Rupture Disc
Relieve ultra-low vacuum or positive pressure conditions with the highly accurate, bidirectional CAL-VAC rupture disk.
Our double-acting design allows the CAL-VAC to do the work of two rupture disks 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 disk. Our double-acting design allows the POS-A-SET to do the work of two rupture disks 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. -
SANITRX LP™ Rupture Disc
The pharmaceutical, biotech, food and beverage industries rely on the high-precision SANITRX rupture disc family - the perfect combination of industry-leading performance with ASME BPE, USP Class VI and 3A compliance. The SANITRX LP rupture disc includes all the features of the original SANITRX rupture disc, slightly modified for applications requiring lower pressures with reduced flow resistance. -
WMP Welded Muffled Plug Rupture Disc Assembly
Protect equipment, personnel and the environment with the threaded, single-use WMP Welded Muffled Plug rupture disc assembly. The WMP is ideal for applications that discharge to the atmosphere at the rupture disc. The WMP is a solid-metal, tension-acting rupture disc that screws directly into a threaded port, providing precise overpressure protection with minimal installation time.
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