The QB3H high pressure valve is capable of operating at high pressures up to 500 PSI (34.47 Bar) and high forward and relief flows up to 50 SCFM (1416 LPM). The QB3H consists of two solenoid valves which add or subtract pressure to the pilot of an integrated volume boosting regulator.

An internal stainless steel pressure sensor measures the high pressure output of the integrated volume booster and sends this signal to the on-board controller. This controller then modulates the two solenoid valves to match the integrated volume booster’s output pressure to the user requested command signal. Aluminum bodies are standard and all brass body units are oxygen cleaned at the factory for the direct control of O2 into any process.

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Accuracy ±


Repeatability ±

Max Flow (SCFM)

Max P2 (PSI)

QB3H Downloads & Links
Documents Links Downloads
Installation Guide GX-Series File Request Form: Use this form to request a file other than a standard QB3H .STEP file
Sales Brochure QBS-Series Submit the form below to download a standard QB3H .STEP File

    QB3H Technical Specifications


    Pressure Range Accuracy Repeatability Max Flow
    Vacuum thru 500 PSI (34.7 Bar) ±0.5% F.S. ±0.2% F.S. 50 SCFM (1416 LPM)
    Port Size Durability Operating Temps Filtration
    3/8″ NPT Immune to shock & vibration (up to 20 Gs) 32-158°F (0-70°C) 40 Micron



    QB3H | Internal Sense

    The QB3H is a complete closed-loop pressure control device consisting of valves, manifold, housing and electronic controls. Pressure is controlled by the use of two solenoid valves that increase, decrease or hold pressure to the top of a diaphragm integrated as a volume booster inside the QB3H. This volume booster allows for flows up to 50 SCFM. The QB3H was designed  specifically for the laser cutting industry, in which it still reigns supreme. However, the ruggedness and dependability of the QB3H has allowed it to be very successful in numerous applications. It works great in static or dynamic conditions and it can be O2 cleaned for the direct control of oxygen.

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