Proportion-Air Products

Proportion-Air products are designed and manufactured in the USA. We make industrial quality electronic pressure regulators and mass flow control valves for most industries. 

Our expertise is in vacuum, low pressure and high pressure control applications that require excellent repeatability. If you do not see what you are looking for, please contact us–chances are pretty good we can help.


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Proportion-Air Products

Electronic Pressure Regulators

and pressure control valves

Mass Flow Controllers

Mass Flow Controllers (electronic)

and flow control valves

Proportion-Air Products

Pilot Operated Regulators

and pneumatic volume boosters

Proportion-Air Products

Pneumatic Safety Regulators

for pneumatic tools & systems

Proportion-Air Products

Proportion-Air designs and manufactures electronic pressure regulators for a wide variety of applications.

Pressure controls are available for very low pressure applications (down to 0-2 inches of water column), very high pressures (up to 1000psi direct electronic control), high flow rates (up to 4 inch pipe), ultra high resolution (up to 0.005% FS resolution), intrinsically safe (Factory Mutual Class 1 Div 1 and Class 1 Div 2), and low cost OEM style pressure controls.

Proportion-Air Products

Proportion-Air manufactures two types of flow control valves: closed loop mass flow control valves and open loop variable orifice flow control valves.

The F-series mass flow transducer is the heart of the closed loop models. The F-series calculates flow based on differential pressure which results in very fast flow measurements. This flow can be connected to Proportion-Air’s pneumatic control valves as a feedback loop for closed loop control. The FCV (Flow Control Valve) is a variable orifice angle seat design. The FCV closes the loop around an internal valve position with an integral LVDT. The position of the valve directly correlates to valve flow capacity (Cv) based on careful design of the parabolic valve plug geometry.

Proportion-Air Products

Proportion-Air offers a complete line of miniature safety regulators designed with safety and performance in mind. These safety regulators are intended to protect people, tools and machines from excessive (and often dangerous) air pressure.

Do you need to limit the air pressure to your brand new pnuematic tool? Would you like to protect your employees from pneumatic hose breaks? How about pre-regulating pressure to one of Proportion-Air’s ultra-low electronic pressure regulators? Maybe, you just want to limit the pressure to your CNC machine and prevent workers from turning it up too high? If you answered “Yes!” to any of these, click here to learn more or contact us for ordering.

Proportion-Air Products

Proportion-Air builds only electronic pressure and electronic flow control valves. Each control valve we build is carefully crafted based on each customers unique application parameters.

Often, a standard catalog valve just isn’t a good fit. Rather than have you design around a catalog valve, Proportion-Air likes to work with each customer to see if modifying our existing technology could provide you with a better solution. See how Proportion-Air products can quickly and cost effectively help you engineer a control valve right for your application.

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Proportion-Air Products

Often called air volume boosters, Proportion-Air manufactures or represents many types of pilot operated regulators to fit your application’s unique parameters. Both piston operated and diaphragm operated volume boosters are offered.

Models are available for high pressures, ratio operation (1:1, 2:1, 15:1, 45:1 and more), steam temperature control, vacuum pressure control, very low pressure control, and for high temperatures. Air piloted regulators are also available in a wide variety of body and elastomer materials for oxygen clean/oxygen compatibility or for corrosive applications.

Specialty Products & Accessories

Proportion-Air Products

Electronic Pressure Transducers

from vacuum to 7500 PSI

Proportion-Air Products

Pro-Air Mizer, Energy Saving Device

compressor header control

Proportion-Air Products

Saturated Steam Control Valves

accurate temperature control

Proportion-Air Products

MizAir, AODD Energy Saving Device

air operated double diaphragm pumps

Proportion-Air Products

Control Valve Accessories

brackets, cables & more

Proportion-Air Products

P2 Profiler | Integrated Mini PLC

Programmable signal generator

Proportion-Air Products

Equilibar Vacuum Regulators

dramatic stability

Proportion-Air Products

Equilibar Back Pressure Regulators

ultra sensitive BPRs

Find Your Product

Select your product based on the first 3-5 digits of the part number. These can be numbers or letters. Products are listed in alphabetic order. The # symbol can represent any single number.

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