Back Pressure Regulator | Precision Pressure Control | Equilibar

Unique pressure control technology for highly demanding applications.

The Equilibar Back Pressure Regulator

Simple Design. Brilliant Control.

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The Equilibar Back Pressure Regulator is our core technology. It features a flexible diaphragm as its only moving part to provide frictionless, stable operation. The Equilibar’s dome-loaded, multiple orifice design offers instantaneous control and exceptional precision for the most complex applications.

Equilibar back pressure regulator Research Series

Research Series
1/16″ – 1/4″
Cv range 1E-08 to 0.41

Laboratory and
gas analysis systems
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Equilibar Back Pressure Regulator GS Series

General Service GS Series
1/4″ – 1″
Cv range 1E-03 to 8.5

Pilot Plant, Gases, liquids
and mixed phase fluids
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Equilibar Back Pressure Regulator BD Series

Industrial Service BD Series
1 1/2″ – 4″
Cv range 1E-02 to 160

Applications requiring larger
sizes and higher flow
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Equilibar FDO8 back pressure regulator for sanitary applications

Sanitary Service FD Series
1/4″ – 3″
Cv range 1E-06 to 36

BioPharma, personal care,
food and other sanitary applications
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Choose Your Back Pressure Regulator

Our Product Selector allows you to search based on your process parameters. TRY IT NOW
Or always feel free to contact an engineer to discuss your needs.

Dome Loaded Back Pressure Regulators

All Equilibar BPRs are dome-loaded pressure regulators. A back pressure regulator is a device that maintains a defined pressure upstream of its own inlet. When fluid pressure at the inlet exceeds the process setpoint, the regulator opens to relieve the excess pressure.  Dome-loaded pressure regulators have gas or air fed into the top (dome) area of the regulator to provide the pressure setpoint for the process. The pressure of the gas in the dome is set by a secondary standard pressure reducing regulator called a pilot regulator. The pilot regulator can be manual or electronic, depending on the application’s requirements. Equilibar sells manual pressure reducing regulators and electronic pressure regulators that work well as pilot pressure regulators for our BPRs.

Equilibar’s unique dome-loaded BPR design uses multiple orifice technology with a supple diaphragm as the only moving part, enabling frictionless operation without hysteresis or cracking pressure and results in an ultra-wide flow range, typically 100 times industry norms. Its synergistic design offers virtually instantaneous control and unprecedented precision for even the most challenging process conditions.

Key Advantages of Equilibar Back Pressure Regulators

High Precision

Dome-loaded design uses 1:1 reference setpoint pressure for instantaneous control. Inlet pressure matches reference pressure within 1-2% through wide flow range – better than 0.5% in most research applications. Frequently used in industrial test benches for liquids and gases.
See Performance Curves

Aggressive Chemistry Compatibility

Our many material options include 100% PTFE construction, SS316L, Hastelloy C276 and other polymers and metal alloys. Our products can be made compatible with virtually every aggressive chemical known.
See chemical compatibility

High Pressure

Research Series back pressure regulators offer precision performance for high pressure applications up to 10,000 psig / 689 bar(g). These regulators provide stable inlet pressure across widely varying flow rates, for liquid, gas, and mixed phase fluids.
See High Pressure Options

Low Dead Volume

Our 1/16″ tube fitting option provides for total dead volume in our back pressure regulator of 0.2 ml. Useful for High Performance Liquid Chromatography and gas analysis services requiring low dead volume.
See Low Dead Volume BPR

Wide Flow Range

Our unique technology allows for precision across a 1000:1 flow range in most applications. Up to 10,000:1 in many research applications.
See Range Performance

Multi-Phase Flow

Our unique design allows for liquids and gases to flow together while maintaining incredible inlet pressure stability. Our multiple orifice design is ideal for minimizing pressure disturbances in two-phase flow. 
See Multi-Phase Flow Capabilities

Ultra Low Flow

By far the lowest flow rate available, down below Flow Coefficient 1E-8 (<0.1 ml/min gas or 0.001 ml/min liquid). Equilibar offers ultra low and zero flow models. 
BPRS for Ultra Low Flow Rates

Ultra Low Pressure

Using delicate diaphragms, our technology gives precision down to 0.02 psig / 1.4 millibar(g) (0.5 in H20 / 12.7 mm H20). See details of our low pressure regulators.
BPRS for Ultra Low pressure  

High Temperature

Our stainless diaphragms can be used to 300°C in many applications. We also have a regulator for applications up to 450°C, useful in petrochemical gas analysis and research that use high temperature reactors.
BPRS for High Temperature  

Note: the terms "Back Pressure Regulator" and "Back Pressure Valve" are often used interchangeably. On this website, we prefer using the "Regulator" term to refer to both.
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