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Onyx Valve Isolator Ring
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Onyx Valve Isolator Ring


The Onyx Isolator Ring is a state-of-the-art solution for maintaining the integrity of your pressure measurement systems. Designed with an integral block valve and module seal, this isolator ring ensures a hermetic seal that keeps instrument oil in and air out, providing reliable and accurate pressure readings.

The innovative design includes a 1/2” thick rubber membrane on the mounting post and a “Stinger Fitting” made of brass or stainless steel. This setup allows for easy gauge replacement without removing the isolator ring from the process pipe, ensuring minimal disruption to your operations.


  • Integral block valve and module seal for reliable performance
  • Hermetic seal with 1/2” thick rubber membrane
  • Stinger Fitting for easy gauge replacement
  • Brass or stainless steel options for durability
  • Simple maintenance process
  • Minimizes process interruptions
  • Enhances measurement accuracy
  • Supports a variety of pressure gauges


  • Industrial pressure measurement
  • Process control systems
  • Vacuum applications
  • Fluid handling systems
  • Gas measurement systems
  • Chemical processing plants
  • Food and beverage industries
  • Pharmaceutical manufacturing


  • Robust 1/2” NPT manifolds
  • Supports multiple heavy instruments
  • One-piece design for leak minimization
  • Made from 316-stainless steel
  • Available in three configurations
  • Suitable for turret case gauges, switches, and transmitters
  • Ensures reliable and accurate readings
  • Easy integration with existing systems



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At Crane Engineering, your experience as our customer matters.

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