Back To Top
The Ashcroft® 81 isolation ring or isolation device is mounted inline with process piping.
Used for process protection of measuring instruments, the "ring" design eliminates process accumulation, it assuring reliable and accurate pressure readings. Ideal when reliable and continuous pressure measurement is needed.
Ashcroft 81 Bolt Thru Isolation Ring


Process size
Type 80 (wafer): 2" to 20"; Type 81 (bolt thru): 1" to 10"
Pressure Class
150 and 300 class


  • 360° sensing flexible inner-liner; no process deadleg
  • Safe Quick Release™ (optional) enables instrument removal without loss of fill or process shut down
  • Needle valve (optional) dampens pulsation effects
  • Retrofit end plates (optional) allows easy replacement of other manufacturer models
Trust the shield.


Ashcroft's passion is to design, manufacture, and deliver the most innovative and well-crafted pressure and temperature instruments so you can always trust the shield.

Get more information on the 80 Bolt Through Isolation Ring from Ashcroft.