QBX Industrial Electronic Pressure Regulator

QBX Industrial Electronic Pressure Regulator


Need a custom solution? All of our products can be customized to meet your specific application needs. Tell us about your project by filling out the Request Quote form.

The QBX pressure control valve is a closed-loop electronic air pressure regulator designed to work in almost any environment.

  • Full vacuum to 175 PSI
  • Wide range of analog and digital command signal options
  • Analog monitor out signal for data acquisition standard

Tested to almost 1 billion cycles, the QBX can last a very long time without the need for re-calibration and maintenance. The ease-of-use and operating life paired with rugged, durable construction means the QBX outlasts competitor products by far. Please note, proper understanding of the application is required to experience this type of longevity.

Like most of our products, the QBX can be modified in numerous ways to meet the most demanding applications. Customizations may change the price of the product. Get a quote for a product customized to your exact needs using the Request Quote tab below.

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Accuracy ±
Repeatability ±
Max Flow (SCFM)
Max PS (PSI)
  • Technical Specs
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  • FAQ
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Technical Specs

Pressure RangeVacuum thru 175 PSI (12 Bar)
Accuracy±0.2% F.S.
Repeatability±0.02% F.S.
Max Flow1.2 SCFM (34 LPM)
Port Size1/8″ NPT (BSPP Available)
DurabilityImmune to shock & vibration (up to 20 Gs)
Operating Temps32-158°F (0-70°C)
Filtration40 Micron


File Request Form:: Use this form to request a file other than a standard QBX .STEP file

Submit the form below to download standard QBX .STEP files

Frequently Asked Questions

  • The QBX series can pilot various volume boosters to control a wide range of fluids and medias, indirectlyLearn more about QB2 Volume Air Booster.

    These gases can be controlled directly with QBX series:

    All noble gases, including: Helium, Neon, Argon, Krypton, Xenon, Radon

    • Carbon Dioxide
    • Compressed Air
    • Nitrogen
    • Nitrous Oxide
    • Oxygen – with O2 cleaned brass manifold option
  • The QBX controls air pressure in proportion to an electric command signal. QBX is available with these command options:

  • The QBX series comes standard with a monitor output signal for simple data acquisition. The QBX is available with these monitor options:

    • No Monitor
    • 0 to 10 VDC
    • 0 to 5 VDC
    • 1 to 5 VDC
    • 4 to 20 mADC (sinking)
    • 4 to 20 mADC (sourcing)
  • The QBX full scale pressure range can be configured in any of the below units of measure:

    • PSI
    • Millibars
    • Bar
    • Kilo-pascal
    • Mega-pascal
    • Millimeters Hg
    • Pascal
    • Inches Hg
    • Inches of water column
    • Millimeters of water column
    • Centimeters of water column
    • Kilograms/cm2
    • Torr – Must be absolute reference unit
  • At Proportion-Air, we always build our products to whatever pressure range our customer needs. We do not offer “off-the-shelf” pre-set pressure ranges for the QBX. If you want your QBX setup for 0-175 PSI control, no problem. But if you want your QBX setup for 2.1 bar to 6.75 bar, no problem. There is no additional cost for custom calibrated pressure ranges.

  • The lowest pressure the QBX can be calibrated to is: 0 to 2 Inches of water column. That is a full scale range of 0 PSI to 0.073 PSI with ±0.2% accuracy!

  • Absolutely! The QBX series can be calibrated to control from atmosphere to full vacuum or vacuum through positive pressure in the same device.

Product Videos

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QB1X | Internal Sense

Electronic Pressure Regulator
The QB1X is a complete closed-loop system consisting of valves, manifold, housing and electronic controls. Pressure is controlled by the use of two solenoid valves. One valve functions as inlet control, the other as exhaust. The pressure output is measured by a pressure transducer internal to the QB1X and provides a feedback signal to the electronic controls. This feedback signal is compared with the command signal input. A difference between the two signals causes one of the solenoid valves to open, allowing flow in or out of the system. Accurate pressure is maintained by controlling these two valves.

QB2X | External Sense

Electronic Pressure Regulator
The QB2X is similar to the QB1X, but uses a double-loop control scheme. In addition to the internal pressure transducer, the QB2X receives an electrical signal from an external sensing device. This primary feedback signal is compared against the command signal input. This comparison is then summed with the internal pressure transducer signal. The gain of the circuit is such that priority is given to the external feedback signal. A difference between the command signal and the feedback signal causes one of the solenoid valves to be activated.