Electronic Air Pressure Control Valves for Your Industry

QB3H-High -Pressure-High-Flow

As you can see from the list of industries we support, our application knowledge is wide ranging and covers a lot of ground. What we do in one industry often lends itself to others.

Proportion-Air makes closed loop electronic pressure regulators and flow valves. We can work any range of pressure from full vacuum to thousands of psi or any point in between. We can calibrate our pressure or vacuum products to work a full scale of just a few inches of water column or any point in between vacuum through thousands of psig. We can calibrate our products to work vacuum through positive pressure.

Recent Industry Brochures

Oil & Gas          |          Tire Manufacturing

Contained Systems for Any Industry

Our devices are closed loop, meaning that they take feedback from a sensor. Our units track a command signal from the customer’s PLC or computer and close the loop around the sensor’s output. PID tuning is not required–the Proportion-Air unit does it all for you. You control the speed at which the proportional unit responds by controlling the speed at which the command signal is adjusted to the device.

Many customers want to capture data as the process we control takes place and bring it back to a chart recorder, computer or panel meter. Most all of the products manufactured by Proportion-Air come with an analog monitor output. This monitor signal comes from the controlling transducer and is a real time output from what is seen by the sensor downstream in the controlled system. This eliminates the need for additional sensors for monitoring.

Seeing is Believing

Our goal with the application concept sketches shown on our website is for the prospective customer to see the depth of our experience and understanding of how to apply our product in any type of application. The customer only needs to describe the desired outcome and what they have to work with; by asking the right questions we will select the right parts for the application. There’s no digging through catalogs and putting part numbers together – we take care of all that. That means the whole process for the customer is easy.

Industries Served

Proportion Air Industries

Die Cast
Food Processing
Injection Molding
Optical Instruments & Lenses
Process Control
Pulp & Paper
Specialty Machinery

We not only work with air and gases, but we can also control liquids and steam as well.  Our products are known for their high accuracy, superior repeatability, excellent resolution and long life.

We specialize in proportional control around six applications:


If you have an application and you’d like to see what we can do for you, please call us at 317-335-2602 and ask for tech support. We look forward to making your project easy for you.

What Our Customers Say

  • What an excellent process you have for specifying parts for your customers. I am very impressed.

    Jamison B. - Monrovia, CA

  • I met with Bill today...He was impressed by your knowledge and application of your products and wanted me to thank you for your excellent support.

    Bob R. - Newark, CA

  • It is really a pleasure to work with Proportion-Air. You cannot imagine what kind of problems I have with some manufacturers. Thank you very much!

    Sungur - Istanbul, Turkey

  • I'm astonished for the quickest answer ever!

    Alessio B. -Bologna, Italy

  • I'm happy to report that the trial on the QPV1 has been going well. I'm quite impressed by the performance of the unit. I'm also very impressed by the service that I received from Nick Archer which I think merits specific attention. Nick has been extremely responsive to my emails and questions. He has been patient, has kept his word, and has always replied to me quickly with an answer or a reply to my questions. Nick has provided me with what I, and certainly others in my group, consider to be a perfect example of top notch high quality customer service.

    John C. - Columbus, Ohio

Call Us from Indianapolis : 317-689-0608

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