About Proportion-Air

About Proportion-Air


Proportion-Air, Inc. is a manufacturer of electronic air pressure regulators and air flow control valves. Proportion-Air, Inc. was founded in 1985 by corporate president Daniel E. Cook to capitalize on the sales and marketing prospects of the unique invention of an electronic air pressure regulator.

This air pressure device was designed to accept a variety of electronic analog and digital signals in order to control pneumatic pressures with extreme accuracy while negating the effects of vibration, mounting position or environmental concerns.

What is Air Pressure Regulation?

A Wide Variety

Proportion-Air offers a large family of electronic air pressure regulators and air flow control valves that allow you to select the best product to match your exact application requirements. Whether you have specific package dimensions, housing requirements or an uncommon electrical interface, Proportion-Air has a product family to match your application.

What is proportional pressure control?

Closed loop electro-pneumatic controls are our only business.

Our competitors are making thousands of products one way.

We manufacture one product thousands of ways.

About Proportion-Air

Where Others Fear to Tread

Proportion-Air goes where others fear to tread: vacuum control, vacuum through positive pressure, absolute pressure, inches of water column and direct control up to 1,000 psi. This variety of outputs can be controlled by an equally diverse range of electrical inputs including analog, digital and serial communications.

Our years of engineering and design experience give us the confidence to take on the most problematic and exacting applications.

Advanced Technology

Proportion-Air handles these difficult requirements with unique advanced control technology, resulting in products with superior accuracy, resolution, and repeatability. This refinement of performance doesn’t mean they’re delicate. All Proportion-Air products are built tough to handle the most adverse environments. Proportion-Air’s advanced “dual loop” technology allows closed loop control using many different downstream sensors in order to control many different processes and applications.
About Proportion-Air

Proportion-Air has become The Future of Control by setting the benchmark

in Advanced Pneumatic Control Technology

About Proportion-Air

The People at Proportion-Air

Proportion-Air’s biggest asset has always been its people. Many companies offer some similar products, but you can’t get a straight answer when you call them. Proportion-Air not only offers superior products, but it has the people to back up those products. Our sole focus is electronic control of pressure and flow and this focus shows in our products. Call us and find out for yourself.


I’m astonished for the quickest answer ever!

Alessio B.

Bologna, Italy

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

Jamison B.

Monrovia, California

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

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.

Neward, California

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!


Istanbul, Turkey

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