AVB™ - Vac-Saf™

Performance Features

  • Designed for gas, liquid and multi-phase service
  • Suitable for operating pressure to 70% of the marked burst pressure (75% of the minimum burst pressure) – Overpressure direction
  • Suitable for operating pressure to 55% of the marked burst pressure (60% of the minimum burst pressure) – Vacuum direction
  • Pressure Equipment Directive “CE” marking and/or other International Certifications
  • BS&B proprietary technology
  • Suitable for use in a flanged or sanitary holder

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  • Sizes & Pressures
  • Burst Tolerance
  • Safety Heads & Sensors
  • Accessories
  • Documentation

Sizes & Pressures

AVB™ Positive Pressure Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)
Disk Size Burst Pressure Relief Area
psig barg
in mm min max min max
3 80 100 0.35 6.89 Full
4 100 5 100 0.35 6.89 Full
6 150 3 85 0.21 5.86 Full
8 200 3 85 0.21 4.48 Full

Note: Burst range includes all tolerances. No additional manufacturing design range

AVB™ Vacuum Relief Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)
Disk Size Burst Pressure Burst Range Relief Area
psig barg
in mm min max min max psig barg in2 cm2
3 80 10 0.2 0.7 ± 0.5 ± 0.4 2.0 13.1
4 100 2 10 0.1 0.7 ± 0.5 ± 0.4 3.6 23.1
6 150 1.5 6 0.1 0.4 ± 0.3 ± 0.02 5.9 38.3
8 200 1 6 0.1 0.4 ± 0.3 ± 0.02 9.3 59.7
Note: Burst range includes all tolerances. No additional manufacturing design range

Burst Tolerance

Marked Burst Pressure Burst Tolerance
3 to 5 psig (0.2 to 0.4 barg) ± 25 psig
6 to 8 psig (0.4 to 0.6 barg) ± 20 psig
9 to 12 psig (0.6 to 0.8 barg) ± 15 psig
13 to 17 psig (0.9 to 1.2 barg) ± 10 psig
18 to 25 psig (1.2 to 1.7 barg) ± 7 psig
26+ psig (1.8+ barg) ± 5 psig

Accessories

BS&B supplies many of the accessories required to safely and conveniently install our overpressure relief devices and complementary products. Through our professional team and global network of sales engineers and procurement personnel, we are able to provide the highest quality accessory products to meet your installation requirements.

Saf-T-Change Quick Disk Replacement (QDR)

After activation, the replacement disk is quickly slid into place. Saving hours of lost production due to blown rupture disks.

Tell-Tale Assemblies & Excess Flow Valves/Gauges

A gauge tap in the outlet flange of the safety head may be considered when the safety head is installed in a vertical position.

Spare Safety Heads & Cap Screws

Jackscrews

When activated, the jackscrews effectively separate the flanges, providing adequate clearance to remove or insert a safety head and external gaskets.

Lifting Lug Eye Bolts

Eye bolts are recommended when weight and/or accessibility is a factor in lifting safety heads.

Baffle Plate

When a safety head is free-vented to atmosphere, a baffle plate may be considered to disperse overpressure and absorb recoil.

Product Literature

AVB Atmospheric Vacuum Breaker Rupture Disk
Vac-Saf™ Series
Detec Saf Alarm System - Burst Disk Monitor
Burst Alert Sensors
Burst Alert Sensors