Bubble Tight Industrial Damper


In today’s world of particulate matter, harmful chemicals, and noxious gases; bubble-tight dampers are playing a more important role than ever.  At most with bubble-tight dampers, you want to ensure they are properly built and tested before they leave the factory to be installed on a critical project.

Each bubble tight damper is manufactured in our ISO 9001 certified facility as well EB Air test bubble-tight dampers to the strictest standards. Every damper we manufacture is tested to the AMCA Standard 500D requirements, which also meets ASME N509 test standards for nuclear air and gas treatment.

EB Air Bubble Tight Damper – Testing Tightness Per The Standard

The Standard model AMCA 500D, allows for a 1/16-inch bubble to form in one second, or a 1/4-inch bubble to form in 60 seconds. Prior to testing the damper, the damper is cycled open and closed a minimum of 10 times to properly set the seals.

To perform accurate testing, a bubble tight damper is attached to the test chamber and secured to make an airtight seal against the opening.  Thereafter pressure is applied on the concave side of the damper inside the test chamber.

While testing, we over pressurize the system by a minimum of 10% to ensure a reasonable margin of safety. Once the damper is pressurized, a commercially available soap and water solution is applied to test all the potential leak paths.

Also, we apply the solution around the seal perimeter where the dish comes in contact with the damper frame. Other possible leak paths include: the dish bracket area of the dish, the tandem seal used to secure shaft and hold the dish assembly. Once complete with concave side of the damper, the outside areas are verified as well – which includes frame welding, shaft penetration and welded threaded bolt locations.

Both inside and outside testing of the damper is carried out with the chamber, and the damper is also flipped over and verified for bubble tightness in the opposite direction. Upon completion of the test, a report is filled out and attached to the damper for shipment. Read more.


This product is generally applied to industrial shut off applications involving rugged construction capable of handling high pressure and temperature. Ideal for Labs, mining ventilation, waste water treatment plants, process applications etc. Available is various sizes to suiting site requirement.

Available in both Square and Round configuration with size starting from, 8”, 10”, 12”,14”, 16”, 18”, 20”, 24”, 26”, 28”, 30”, 36”, 48” and 60”

We make custom size zero leakage dampers, industrial dampers, butterfly dampers matching to any duct sizes.

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EBA’s unique Bubble Tight Isolation Dampers (BTD) utilize the rotating disc principle that has proven very successful in many applications. The rugged industrial damper has also been developed for areas where leaks could result in hazardous conditions as well for high pressure and high temperature applications.

The primary advantage of Bubble tight damper when compared to conventional butterfly valve is no metal to metal contact between dish gasket and frame also unique smother design minimizes accumulation of particulates on seals, increase reliability and lower maintenance.

The dampers are built to the highest industry standards and is individually tested for zero bubble leakage against a differential pressure of 10 inches as specified in ASME N509 standard.