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Pressure Reliefs

Pressure Relief - Ultrahigh (UHV) High In-Vacuum (HV), drawing

High (HV) and Ultrahigh (UHV) Pressure Relief

Vacuum systems are engineered to operate under external (atmospheric) pressure loads, and not intended for internal pressurization.  Accu-Glass Ultrahigh (UHV) and High In-Vacuum (HV) pressure relief products are important and preventative safety devices designed to protect vacuum systems against internal over-pressurization.

There are many scenarios in which rapid pressure buildup inside a vacuum vessel may occur — such as a runaway gas back-fill operation.  Besides protecting delicate system instruments and equipment, such as vacuum viewports — UHV and HV Pressure Relief products minimize the risk of injury to system operators and other laboratory personnel.

The following chart is for the Burst Discs only.  For the Variable Pressure Relief Feedthroughs, please click on that option below.


Burst Disc and Pressure Relief Feedthrough Specifications
Burst Pressure  
  • High-Pressure Diaphragm Type
  • Low-Pressure Diaphragm Type
  • Adjustable Pressure Relief Valve Type

15 - 25 PSIG
7.5 - 11.5 PSIG
0.5 - 2.0 PSIG
Burst Disc and Pressure Relief Feedthrough Material Specifications
  • Body
  • Diaphragm 
  • Adjustable PRV Type

304 Stainless Steel
316 Stainless Steel

304 Stainless Steel
6061 Aluminum

Burst Disc and Pressure Relief Feedthrough Vacuum Range Specifications
Vacuum Range  
  • UHV, Ultrahigh vacuum
  • HV, High vacuum
  • Adjustable PRV Type
      HV, High vacuum

1x10-10 Torr
1x10-8 Torr

1x10-8 Torr
Burst Disc and Pressure Relief Feedthrough Temperature Range Specifications
Temperature Range  
  • Burst Disc Diaphragm
  • Flange Mount, Conflat
  • Flange Mount, ISO
  • NPT Pipe Thread Fitting
  • Adjustable PRV Type
     PRV Main Seal, Viton®



* Overall assembly ratings must be adjusted to that of the lowest-rated component.