Electronic Back Pressure Regulators | Equilibar Precision Pressure Control

Electronic Back Pressure Regulators

Electronic Back Pressure Regulators

One advantage of using a dome-loaded back pressure regulator is the freedom to choose the type of dome setpoint option for each individual situation. Equilibar provides a complete solution for electronic back pressure control by offering a selection of electronic pressure regulators to control the dome setpoint signal.

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Flexibile Control Options

Designing a pressure control system can be a long-term project with frequent specification changes. An Equilibar® back pressure regulator can simplify this process with both its high flow turndown ratios and flexible setpoint options. The dome-loaded design allows initial setup with a manually controlled system, then subsequent setup with electronic control without having to purchase a new back pressure regulator.

Example Applications

Dome-loaded Back Pressure Regulators
Liquid Pump Application


The schematic above shows how a dome-loaded back pressure regulator can be used to control the flow rate to a dispensing application. Instead of using a complex variable speed pump, the output pressure of any type of pump can be controlled by the BPR, which allows only enough fluid to return to the supply vessel as required to limit the dispensing pressure. The PID flow control loop controls the signal to the electronic pressure regulator, which thereby controls the setpoint of the dome-loaded BPR with an air pressure signal.

While this example does use a PID flow controller, the reaction time of this system is infinitely faster than that of a PID controlled control valve. That is because the control valve action has to swing suddenly with every change in dispensing flow rate. However, the BPR will hold the header pressure constant without any change in controller output. The PID is therefore only used for small adjustments to the header pressure, and can be tuned slower while also enjoying instantaneous reaction from the regulator.


Dome-loaded Back Pressure Regulators
Gas Reactor Application

The schematic above shows an electronic pressure regulator and a dome-loaded back pressure regulator controlling the pressure of a laboratory reactor, such as might be used in catalyst research. Two separate Mass Flow Controllers (MFCs) are used to inject reactants into the vessel. The vessel pressure is monitored by the process computer. The pressure in the reactor is commanded by the computer through an electronic pressure regulator, which produces an air or nitrogen pressure signal to the dome-loaded BPR. The BPR allows only enough gas to escape from the reactor to precisely maintain the desired pressure setting.


Learn more about Equilibar’s ultra sensitive dome-loaded back pressure regulators.

Contact an application engineer to discuss your specific application.

Image of Equilibar electronic back pressure regulator

Electronic Back Pressure Regulator
Back pressure control is conveniently achieved by directly piloting the Equilibar valve with an electronic pilot regulator such as the Equilibar QPV shown here.
Equilibar performance comparison chart
The Equilibar back pressure regulator provides stability through 1000:1 flow rate range.

Click the Video Link to See How an Electronic Back Pressure Regulator Works

Other Equilibar Back Pressure Products:

research series back pressure regulator Research Series Back Pressure Regulators 1/16" to 1/4" up to 10,000 psig / 690 bar(g)
general service back pressure regulator GS series General Service Back Pressure Regulators 1/4" to 1" up to 2500 psig / 172 bar(g)
industrial service back pressure valve BD seriesIndustrial Service Back Pressure Valves 1.5" to 4" up to 150 psig / 10 bar(g)
image of GS back pressure regulator with QPV pilot regulatorElectronic Back Pressure Regulators 1/4" to 4" up to 5000 psig / 344 bar(g)
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Flow Control Magazine features oil well injection using Equilibar valves to improve performance

An exciting case study featuring oil well injection in the Bakken Basin of North Dakota was published in the June 2020 issue of Flow Control Magazine.  Co-authored by Diane Jacober of Equilibar and Christopher Duffield of Intermountain Electronics , the article explains how direct-sealing diaphragm valves offer practical advantages for difficult flow control applications, especially Read More

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