Equilibar precision back pressure regulator Equilibar performance comparison chart
The precision of equilibar regulators is unparalleled in low and medium pressure applications. Chart illustrates typical performance in the 0-50 psig range.

Equilibar NL Performance Brochure
NL Series Brochure



Application Bulletins:
Extrusion Systems Pressure Control

Equilibar Back Pressure Regulator

Patented technology provides unmatched precision and ease of automation

Equilibar introduces a new type of back pressure regulator with more than 5X the flow stability of traditional spring regulators. The dome-loaded design precisely matches your process pressure to a set-point pressure signal, even through widely varying flow rates.

The characteristics of this product are so unique that it is opening up new classes of fluid control applications.

This technology can be readily applied to pressures down to 0.02 psig. Common pipe sizes are from 1/8" to 3".

Our new Instrument Series back pressure regulator can handle pressure up to 5000 psig with gas flow rates down below 1 ml/min and Valve Coefficients (Cv) down to 1E-8.


Back Pressure Regulator Product Details & Brochures

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Frequently Asked Questions

What makes the Equilibar; technology unique?

The Equilibar® back pressure regulator uses a fully frictionless design that is dramatically more precise than ordinary back pressure regulators - especially in the low and medium pressure ranges.

This unique approach also provides much greater support for ultra low pressure applications and very low flow applications.

See Features and Benefits for more information.

How do I provide my SetPoint to this regulator?

The Equilibar® achieves it precision by providing a fluid set-point pressure to the top of the diaphragm.

For manual applications, we can provide an optional Air Spring SetPoint Kit (as shown above). For automatic applications, we can provide an optional Electro-Pneumatic Regulator Kit. Finally, for very low pressure applications, we offer the LPR2 Ultra Low Pressure Regulator for the set-point kit.

How is this different from other dome-loaded back pressure regulators?

The Equilibar® is a type of dome-pressure regulator, but uses a innovative seat design giving it much higher precision and stability from 0 -100% of its flow range. Traditional back pressure regulator seat designs are typically optimized to be stable in limited flow ranges. Learn more about How it Works.

How low pressure can it control?

The Equilibar offers unmatched performance in very low pressure ranges, with excellent control down to about 1" water column (0.02 psi). Depending of flow and body size, it can easily achieve precision better than 0.25" water column (0.01 psi). Learn more about Low Pressure Back Pressure Regulators or our full line of Low Pressure Solutions.

What other features make the Equilibar® back pressure regulator unique?

  • Springless; a special flexible diaphragm is the only moving part
  • Compatible with problematic shear sensitive applications
  • Simple, sanitary design compatible with pharmaceutical or food applications
  • Extremely fast response
  • Dampens system pulsations
  • Reference pressure can be a second process fluid (fluid pressure balancing)

How can I use the Equlibar® back pressure regulator to automate my process?

The Equilibar® excels at computer automation applications.  By connecting an electro-pneumatic transducer to the reference port, the Equilibar® allows your process computer to vary process pressure with precision to 0.01 psi!    This could be used for everything from simple flowrate control to controlling reactor conditions in a research environment.