HPFlap, Inc.
HPF, Inc.
13540 Indian Creek
Cleveland, Ohio 44130
Tel: 440-816-2195
Fax: 440-816-2196

Gauge Isolation Ring

The Gauge isolation ring is designed to isolate gauges or pressure switches from solids in process flow and to ensure accurate pressure readings. The isolation ring utilizes a specifically designed flush-mounted flexible inner cylinder, behind which is a clean captive liquid. As process flows through the pipe, it exerts pressure through the flexible cylinder to the captive liquid. Pressure is monitored by the gauge or switch which is completely isolated from process flow.

Features and Benefits

  • Gauge is in contact only with captive liquid and never directly with the process liquid
  • Isolating the gauge from solids in process flow results in accurate readings.
  • Gauge can be removed for calibration, repair or replacement, without interrupting process flow.
  • Unique flexible cylinder prevents plugging, which means pressure readings are more reliable and accurate.
  • Incidental design eliminate accidental breakage
  • Adaptable to a variety of process conditions and applications.
  • Will not clog (which is not true of diaphragm seals)

  • Specifications:

  • Housing:
  • Isolation Ring: Carbon Steel, 316 Stainless Steel

    Isolation Spool: Carbon Steel

  • Assembly Flanges:
  • Isolation Ring: Carbon Steel, 316 Stainless, CPVC

    Isolation Spool: Carbon Steel, 316 Stainless, CPVC

  • Inner Flexible Wall:
  • Isolation Ring: Rubber Seals, PTFE

  • Captive Sensing Liquid:
  • Isolation Ring: 50% water / 50% Propylene Glycol

         Silicone Oil (FDA Approved)
         Mineral Oil
         Distilled Water


    Isolation Ring: 2" through 20"

    Isolation Spool: 2" through 12"

    Isolation Ring

    Isolation Spool - Threaded

    Isolation Spool - Flanged

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