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STEMCO Releases Aeris by Stemco, a Patented High-Performance Automatic Tire Inflation System

(LONGVIEW, Texas – February 21, 2012) STEMCO, an EnPro Industries company, announces the release of AerisTM by Stemco, an advanced automatic tire inflation system based on patented rotary sealing technology and precision electronic airflow detection.  The system is designed to keep commercial trailer tires properly inflated using air pressure from the trailer’s braking system. 

The rotary seal employed in AerisTM by Stemco differs dramatically from currently available systems and is targeted to increase the reliability and durability of these components substantially.  The rotary seal in an automatic tire inflation system is a critical component – it prevents the higher pressures needed to inflate commercial tires (typically 100 psi) from leaking into the wheel end, which can handle no more than 6 psi.  Excess pressure can cause the wheel end seal to fail prematurely, causing lubricants to exit the hub and leaving moving parts susceptible to wear and seizure – a dangerous scenario.  In addition to the high reliability and durability of the patented sealing system, AerisTM by Stemco also includes several one-way pressure relief valves per axle to ensure that the wheel-end is never pressurized. 

AerisTM by Stemco also includes a very sensitive electronic flow detection technology capable of informing the driver whether the system is making a minor adjustment to tire pressure or if a major leak is present.  A “Smart Sense” wheel end identification option will inform the driver which wheel end is taking air – saving time and labor in the search and repair of tire leaks.

“This product represents a leap forward in automatic tire inflation technology.  We started with an unwavering commitment to increase the safety of our roadways by protecting the wheel end from damaging air pressure, and then added several additional safeguards and features.  We have also been very impressed with the reliability and durability of the critical wear components,” said Bob Montgomery, Vice President of Stemco’s Intelligent Transportation Systems (ITS) group.  “Aeris augments our BatRF by STEMCO tire pressure monitoring systems to complete our suite of tire pressure management solutions.”

The AerisTM by Stemco system will be on display at the annual meeting of the American Trucking Associations’ Technology and Maintenance Council (TMC) this week in Tampa, Florida.

STEMCO Intelligent Transportation Systems

STEMCO Intelligent Transportation Systems, with headquarters and manufacturing facilities in Longview, TX, is a leader in the design, manufacturing and marketing of RF-enabled sensing, data collection, and analysis technologies for heavy-duty trucks and trailers.  Its line of tire pressure management solutions includes BatRF by STEMCO tire pressure monitoring systems and AerisTM by Stemco automatic tire inflation systems.

STEMCO LP, with offices and manufacturing facilities in Texas, Georgia, Michigan, New York, Canada, Australia and China. STEMCO is a leader in the technology and manufacture of commercial vehicle wheel end, braking and suspension components, as well as Intelligent Transportation Systems. STEMCO is an EnPro Industries, Inc. (NYSE: NPO) company. EnPro is a leader in the manufacture of sealing technologies and engineered products for use in critical applications by industries worldwide. For more information, visit

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