QB4 High Flow Valve Series

Brand: Proportion-Air, Inc

The QB4 high flow electronic control valve is a closed-loop electronic pressure regulator with the ability to achieve flow rates as high as 200 SCFM forward flow and 200 SCFM exhaust flow. It can be calibrated to work from vacuum to 150 PSI or any range in between.

The QB4 high flow control valve is made up of two solenoid valves, an internal pressure transducer and an electronic control circuit mounted to an integrated volume booster.

Output pressure is proportional to an electrical input command signal. Command signals come in a choice of either a differential 0-10 VDC, 4-20 mA, Serial or Ethernet.

The QB4 high flow control valve also provides an electrical monitor signal for output to a panel meter or controller for data acquisition and/or quality assurance needs.

The QB4 volume booster does not have stamped gaskets, special molded diaphragm or seal parts. All of the parts related to normal maintenance are standard o-rings.


Pressure Range

  • Vacuum thru 150 psi (10.3 bar)


  • ± 0.4 % of Full Scale


  • ± 0.3 % of Full Scale

Maximum Flow

  • 200 scfm (5667 LPM)

Port Size

  • 1/2” NPT (BSPP Available)


  • Immune to Shock & Vibration (up to 25 Gs)

Operating Temperature

  • 32° to 158° F (0° to 70° C)


  • 40 micron


Installation Instructions

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