QL3 High Resolution Valve Series

Brand: Proportion-Air, Inc

The QL3 (high resolution, high flow electro-pneumatic pressure regulator) allows high volumes of air to move quickly and precisely at pressures up to 150 psig using proportional solenoid valves with a unique analog PID circuit.

The QL3 improves and builds on the proven technology of the Proportion-Air QB3 series by using a current driven variable orifice solenoid valve and a unique analog PID circuit.

This variable orifice solenoid avoids the pressure “steps” prevalent in most feed and bleed I/Ps.

The PID integrates error out quickly resulting in superior resolution. The combination of a step-less solenoid valve with a high speed analog PID on a high flow volume booster allows a lot of air to be moved in a hurry, but precisely.

The output is proportional to the electrical input or command signal and an analog monitor output signal is standard.


Pressure Range

  • 0 to 5 psi thru 0 to 150, 10.3 bar


  • ± 0.05 % of Full Scale


  • ± 0.4 % of Full Scale

Maximum Flow

  • 25 scfm, 708 LPM

Port Size

  • 1/4” NPT, BSPP Available


  • Immune to vibration & shock (up to 20 Gs)

Operating Temperature

  • 32° to 158° F (0° to 70° C)


  • 40 micron


Installation Instructions

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