Proportion-Air
Electronic air-pressure regulators and air-flow control.
Proportion-Air builds electronic air pressure regulators and air flow control -- closed-loop electro-pneumatic devices that hold a pressure or a flow rate to match an electrical command signal. The line covers electronic regulators, mechanical regulators, mass flow controllers and pressure transducers, and the company lists pressure control from vacuum to over 5000 psi and gas flow from 2 SCFH to 250 SCFM. The reason to specify electronic over mechanical is simple: when the setpoint has to be changed by the control system, logged, or ramped during a cycle, a hand-set regulator cannot do it.
What we carry, by measurement
Pick what you’re measuring.
The flagship products. All do the same job -- convert a command signal into a controlled output pressure -- so selection is by pressure range, flow capacity, resolution needed, and area classification.
Low pressure electronic regulators
Electronic regulators for low output pressures.
Use it whenUse one when the controlled pressure is low and needs to be accurate at the bottom of the range -- a general-purpose regulator will not resolve well down there. Common on light clamping, tensioning and gentle handling.
High pressure electronic regulators
Electronic regulators for high output pressures, within a line the company lists as reaching over 5000 psi.
Use it whenUse one when the application needs commanded pressure well above shop air -- leak and burst testing, hydrostatic work, high-force actuation.
High flow electronic regulators
Electronic regulators sized for high flow.
Use it whenUse one when the volume being pressurized is large or the pressure has to recover quickly after a demand -- a big cylinder, a large vessel, a fast cycle. Undersizing flow here shows up as a regulator that reads correct but cannot keep up.
High resolution electronic regulators
Electronic regulators offering fine resolution of the controlled pressure.
Use it whenUse one when small pressure increments matter more than speed or capacity -- precision force control, calibration work, sensitive material handling.
Hazardous location electronic regulators
Electronic regulators for hazardous location service.
Use it whenUse one when the regulator has to sit in a classified area. Confirm the specific approval against the site's classification before ordering, since that is what the selection turns on.
Passive regulation, no signal and no power. Cheaper and simpler, and the right answer whenever the setpoint gets set once and left alone.
Pressure reducing regulators
Mechanical regulators that reduce a higher inlet pressure to a set outlet pressure.
Use it whenUse one for ordinary downstream pressure setting where nothing needs to adjust it remotely. This is the default until somebody needs the setpoint to change during operation.
Back pressure regulators
Mechanical regulators that control pressure upstream of themselves.
Use it whenUse one when the pressure you must hold is on the inlet side -- maintaining pressure in a vessel or line while allowing excess to pass. This is a different job from reducing, and the two are not interchangeable.
General purpose mechanical regulators
Mechanical regulators for general pneumatic service.
Use it whenUse them for routine air preparation and utility regulation where precision is not the point.
Pneumatic safety regulators
Regulators in the line's safety category.
Use it whenSpecify these where the concern is protecting people or equipment from overpressure rather than controlling a process value. Confirm the specific model and its function with Proportion-Air, as this category overlaps with the Protect-Air USA sibling brand.
Closed-loop electronic control of gas flow rate, which the company lists across 2 SCFH to 250 SCFM. Specify by the flow the process needs, and by whether you want a controller or just a valve.
F-Series
Flow transducers within the mass flow range.
Use it whenUse them when you need to measure the gas flow as a signal, feeding control that lives elsewhere.
FCV flow control valves
Flow control valves in the mass flow range.
Use it whenUse one when the control loop is closed by your own controller and you need the final control element only.
FQB2, FQB3 and FQPV2 mass flow controllers
Closed-loop mass flow controllers.
Use it whenUse one when the requirement is 'deliver this many SCFM of this gas and hold it' and you want the device to close the loop itself rather than building flow control into the machine controller. Select the model by the flow range the process needs.
Measurement to close the loop or verify the result. The three variants split cleanly by service, which makes selection straightforward.
DSB industrial pressure transducers
Pressure transducers for industrial service.
Use it whenUse them as the general-purpose choice for measuring gas or fluid pressure on a machine or process.
DST high pressure transducers
Pressure transducers for high pressure service.
Use it whenUse them when the measured pressure exceeds what the industrial models cover -- typically alongside the high pressure electronic regulators.
DSW transducers
Pressure transducers the site describes as NIST-rated.
Use it whenUse them when the reading has to be traceable -- calibration work, quality records, a customer or auditor who requires documented accuracy. Confirm the exact traceability documentation with Proportion-Air, as that is usually the reason this model gets specified.
Assembled products and the supporting parts. Air quality matters here for the same reason it does on any proportional device -- dirty or wet air shows up as drift.
Proportion-Air Supply
A system-level product in the electro-pneumatic systems category.
Use it whenAsk about it when the requirement is a supplied, assembled pressure source rather than a component to design in. Confirm the configuration with Proportion-Air.
Pump Controller
A system-level pump control product.
Use it whenAsk about it where an air-driven pump needs its pressure or output controlled electronically rather than by hand-setting a regulator.
Control valve accessories
Supporting components organized by regulator type, covering electro-pneumatic, mechanical and miniature regulators.
Use it whenOrder accessories against the specific regulator family, since the site organizes them that way. Include air preparation on any electronic regulator -- contamination that an on-off valve tolerates will show up as drift in a closed-loop device.
Cross-references & replacements
Replacing an existing Proportion-Air product, or cross-referencing from another manufacturer? Send the old part number or a photo of the nameplate. Cross-references and sizing are at no charge, and we’d rather tell you an equivalent won’t work than sell you one that doesn’t.
Send a part number or a printProduct family information on this page was taken from proportionair.com and last verified . Specifications and model availability are the manufacturer’s and can change. We confirm current details when we quote.