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81 Bolt-Thru Isolation Ring

Brand: Ashcroft Inc
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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.
Features
  • 360° instrument rotation with SQR option 
  • Selection of 1" through 20" nominal pipe size 
  • Non-clogging/low maintenance 
  • Complete instrument protection 
  • Ensure reliable/accurate pressure readings 
  • Optional retrofit flange to replace competitive units 
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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.
Features
  • 360° instrument rotation with SQR option 
  • Selection of 1" through 20" nominal pipe size 
  • Non-clogging/low maintenance 
  • Complete instrument protection 
  • Ensure reliable/accurate pressure readings 
  • Optional retrofit flange to replace competitive units 
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Specifications

Brand

Process Temperature

  • Buna-N & Natural Rubber: -34° to 107° C (-30° to 225° F)
  • EPDM: -40° to 149° C (-40° to 300° F)
  • Teflon & Viton: -25° to 177° C (-15° to 350° F)

Size

  • Bolt-Thru: 1” to 10” (25.4 to 254 mm)

Temperature Range

  • Fill Glycerin: 0° to 204° C (0° to 400° F)
  • Fill Halocarbon: -57° to 149° C (-70° to 300° F)
  • Fill Silicone (10 cSt): -40° to 260° C (-40° to 500° F)
  • Fill Silicone (50 cSt): -40° to 316° C (-40° to 600° F)

Flange Size - 1” (DN 25)

  • 1” (DN 25) - 150# ASME
  • 1” (DN 25) - 300# ASME

Flange Type

  • Retrofit Flange

Flange Size - 1-1/2” (DN 40)

  • 1-1/2” (DN 40) - 150# ASME

Flange Size - 6” (DN 150)

  • 6” (DN 150) - 150# ASME
  • 6” (DN 150) - 300# ASME

Materials of Construction

  • Flexible Liner: Buna
  • Flexible Liner: EPDM
  • Flexible Liner: Natural Rubber
  • Flexible Liner: Teflon
  • Flexible Liner: Viton

Flange Size - 8” (DN 200)

  • 8” (DN 200) - 150# ASME
  • 8” (DN 200) - 300# ASME

NPS Connection

  • 1” NPS Male
  • 10” NPS Male
  • 1-1/2” NPS Male
  • 12” NPS Male
  • 14” NPS Male
  • 16” NPS Male
  • 18” NPS Male
  • 2” NPS Male
  • 20” NPS Male
  • 3” NPS Male
  • 4” NPS Male
  • 6” NPS Male
  • 8” NPS Male

Flange Size - 4” (DN 100)

  • 4” (DN 100) - 150# ASME
  • 4” (DN 100) - 300# ASME

Flange Size - 2” (DN 50)

  • 2” (DN 50) - 150# ASME
  • 2” (DN 50) - 300# ASME

Flange Material

  • 316L Stainless Steel
  • Carbon Steel
  • CPVC
  • PVDF

Fill Material

  • Glycerin
  • Halocarbon
  • Silicone

NPT Connection

  • 1/2” NPT Male
  • 1/4” NPT Male

Flange Size - 3” (DN 80)

  • 3” (DN 80) - 150# ASME
  • 3” (DN 80) - 300# ASME

Mounting

  • Direct Mounting

Flange Size - 10” (DN 250)

  • 10” (DN 250) - 150# ASME
  • 10” (DN 250) - 300# ASME

Enclosure, Body Material

  • 316L Stainless Steel
  • Carbon Steel

Rotation

  • 360° Instrument Rotation

Approvals & Certifications

  • CRN
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Typical Applications

  • Mining
  • Water & Wastewater
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