Proportion-Air leads the way in the electronic control of low to very low air pressures. Our electronic low pressure valves and regulators are used in many applications, from tank blanketing to dispensing to microfluidics. It is our ability to create a custom pressure range (tailored to your application) paired with our electrical knowledge that provides our customers the confidence in our low pressure valves.

2 inches of water column = 0.072 PSI

A 0-2″ H2O full scale calibration and accuracy of ±0.2%, equates to an accuracy of ±0.0001 PSI throughout the entire calibrated range.

We specialize in pressure ranges below 5 PSI, but we don’t stop there. Proportion-Air can offer products with a full scale calibration of 0 to 2 inches of water column with an accuracy of ±0.2%.

Most of our competitors expect you to understand the nuances of pneumatic control and choose a product off the shelf. We build to your specifications. We want to understand your application so you do not waste your time testing products that may (or may not) meet your needs.

Assembly Option: Three Distinct Components

When an application requires more flow than a single unit can offer, our QB & volume booster assemblies can meet your needs.

1 – QB2X Electronic Pressure Regulator provides an air pilot signal to the dome of the air volume booster. By controlling pressure to the top of the diaphragm, we control pressure out of the volume booster.

2 – An Air Volume Booster, also known as a dome-loaded or pilot-operated pressure regulator. This can be a pressure reducing valve or a back pressure valve. We have many volume boosters available that can handle different pressures, medias and flow rates. Understanding the application is critical to specifying the best fit.

3 – A DSB or DST Pressure Transducer measures output pressure of the volume booster and provides this feedback signal to the QB2. The QB2 adjusts dome pressure (based on this feedback) to achieve the commanded pressure in the process.

QB2 & Volume Air Booster