Zero Leakage Bubble Tight Industrial Damper
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Bubble tight dampers matter more than ever in a world of toxic gases, hazardous chemicals, and airborne particulates. When you specify a bubble tight damper, you need certainty that it was built and tested correctly before it ever leaves the factory. EB Air Control is an ISO 9001-certified manufacturer and supplier of bubble tight isolation dampers, with strict factory leak testing protocols applied to every unit before shipment.
What Is a Bubble Tight Damper?
A bubble tight damper is an air control device built to provide a true airtight seal. Like a bubble in water signaling no leak, it confirms that no gas or air escapes past the blade when the damper is closed. These dampers are used in HVAC systems, cleanrooms, laboratories, and industrial containment applications that need tight control over airflow and pressure. Their airtight seal makes them well-suited for energy conservation, environmental control, and contamination prevention in sensitive or hazardous environments, including as a bubble tight damper for BIBO (Bag In, Bag Out) housing applications.
Need a Damper You Can Trust for Zero Leakage Isolation?
Whether you are isolating hazardous gases, protecting a cleanroom, or meeting strict containment requirements, EB Air Control can help you specify the right bubble tight damper for your application.
Product Description
Actuator and Motor Options
EB Air’s bubble-tight isolation dampers can be fitted with a range of actuators and motors to match the specifications of engineers, consultants, and owners, from simple ON/OFF control to full modulating control. Actuators can be selected with options such as spring return, end switches, fail-safe position, and a built-in thermistor with NEMA ratings. For high pressure applications, higher torque actuators are available for quick open and close cycles. Manual quadrant and sprocket gear operation are also available as alternatives to powered actuation.
For specific application and actuator selection, contact the factory for details.
Bubble Tight Damper vs Conventional Butterfly Valve
| Feature | Bubble Tight Damper | Conventional Butterfly Valve |
| Metal-to-metal contact | None | Present at seat |
| Leakage rating | True zero leakage | Low leakage, not zero |
| Particulate buildup on seal | Minimal, due to smoother design | Higher over time |
| Long-term maintenance | Lower | Higher |
| Suited for hazardous isolation | Yes | Limited |
For applications where any leak carries a safety, contamination, or regulatory risk, this is usually the deciding factor: a bubble tight damper is built specifically to close that gap, while a conventional butterfly valve was never designed to guarantee true zero leakage.
Typical Industries
- Nuclear facilities
- Pharmaceutical manufacturing
- Laboratories
- Cleanrooms
- BIBO filtration systems
- Chemical processing plants
- Industrial containment systems
APPLICATION
Applications of the Bubble Tight Damper
EB Air’s bubble tight isolation dampers (BTD) use a rotating disc design that has proven reliable across a wide range of applications. This rugged industrial damper was developed specifically for environments where a leak could create a hazardous condition, and it is built to perform in high-pressure and high-temperature applications as a high-temperature bubble tight damper.
The main advantage of a bubble tight damper over a conventional butterfly valve is that there is no metal-to-metal contact between the dish gasket and the frame. This smoother design also reduces the buildup of particulates on the seal, which improves reliability and lowers long-term maintenance, making it a practical industrial tight seal damper for demanding process environments.
Every damper is individually factory tested for zero leakage using the pressure decay method, in accordance with ASME N510-1995 (reaffirmed), the specified standard for zero leakage testing. Damper performance is further verified to Frame Leakage Class A and Seat Leakage Class 0 under ASME AG-1, AMCA 500-D-18, and international standards including EN 12266-1, EN 12266-2, DIN 3230-BO, and DIN 25496.
Design and Testing
The rotating disc design is what sets a bubble tight isolation damper apart from standard isolation dampers. As the disc rotates closed, the dish gasket seats against the frame without ever making metal-to-metal contact, which is what allows the damper to reach true zero leakage rather than a low-leakage approximation.
To confirm this performance, EB Air tests its dampers using the pressure decay method rather than relying on visual bubble checks alone. Per DIN 25496, on-site air tightness must show a leakage rate of less than 3 x 10⁻⁵ of nominal airflow at 2 kPa, and every damper is verified under a 250,000 open and close cycle test. This level of testing is why facility engineers can specify an EB Air bubble tight damper for critical isolation points without needing to add a secondary containment layer.
Every damper is manufactured under a quality assurance program that meets ISO 9001:2015 and KTA 1401 requirements for nuclear facility quality assurance, and pressure-retaining weld joints and seams are continuously welded with no porosities allowed. Welding procedures, welders, and welder operators are qualified to ASME Boiler and Pressure Vessel Code IX and AMCA N 509/510 or EN 729-2 and 287-1.
KEY FEATURES
- True zero leakage seal, factory tested using the pressure decay method
- No metal-to-metal contact between dish and frame, which reduces wear and particulate buildup
- Available in both circular and square housings for different duct configurations
- Corrosion resistant materials, including stainless steel options for harsh environments
- Rated for high pressure and high temperature applications
- Manual, pneumatic, or electric actuation available, including ON/OFF and modulating control
- Suitable as a bubble tight damper for tight seal applications in cleanrooms, labs, and BIBO housing systems
- Adaptable to framing valves and custom sizing for most applications
BENEFITS
Benefits of the Bubble Tight Damper
- Prevents hazardous gas or contaminated air from escaping isolated sections of a system
- Maintains clean, filtered air in sensitive environments like cleanrooms and laboratories
- Tight seal design retains energy that would otherwise be lost, helping lower heating and cooling costs
- Lower maintenance, with few moving parts to service
- Increased reliability, built with high-grade materials to the highest industry standards
- Supports compliance with strict air quality and containment requirements across regulated industries
SPECIFICATIONS
Technical Specifications
| Specification | Detail |
| Damper type | Bubble-tight isolation damper, rotating disc design |
| Housing shapes | Circular and square |
| Casing material | Mild steel or 304 stainless steel |
| Dish material | Spun galvanized steel or 304 stainless steel |
| Shaft material | 304 stainless steel |
| Gasket material | Extruded neoprene or silicone |
| Bearings | Nylon |
| Leak test method | Pressure decay method |
| Leak test result | Less than 3 x 10⁻⁵ of nominal airflow at 2 kPa, per DIN 25496 |
| Cycle testing | 250,000 open/close cycles |
| Test standards | ASME N510-1995 (reaffirmed, primary specified standard); also verified to ASME AG-1, AMCA 500-D-18, EN 12266-1 & EN 12266-2, DIN 3230-BO, and DIN 25496 |
| Quality assurance program | ISO 9001:2015, KTA 1401 (Nuclear Facility QA Program Requirements), ASME NQA-1 |
| Welding qualification | ASME Boiler and Pressure Vessel Code Section IX, or EN 729-2 and 287-1 |
| Actuation options | Manual (ON/OFF or modulating), pneumatic, or electric, with spring return, end switches, fail-safe position, and built-in thermistor options |
| Temperature range | Contact factory for project-specific ratings |
| Typical applications | HVAC isolation, cleanrooms, laboratories, BIBO housing, industrial containment, nuclear facilities |
WHY CHOOSE US
Why Choose EB Air Control for Bubble Tight Dampers?
- ISO 9001-certified manufacturing facility with strict factory leak testing protocols on every unit
- Independently verified performance, including 250,000-cycle testing and pressure decay leak results
- Custom circular and square housing configurations to match your application
- Trusted by facilities across the United States, Canada, South East Asia, and the Gulf/ Middle East
- Direct engineering support for sizing, actuation, and high-temperature or high-pressure requirements
FAQs
Q1. How is a bubble tight damper different from a conventional damper or butterfly valve?
A bubble tight damper has no metal-to-metal contact between the dish gasket and the frame, which allows it to achieve true zero leakage. A conventional butterfly valve can reduce airflow but is not built to guarantee zero leakage.
Q2. How is a bubble tight damper tested for leaks?
EB Air tests each damper using the pressure decay method, confirming zero leakage at a specified differential pressure. Independent testing has also verified performance across 250,000 open and close cycles.
Q3. Is a bubble tight damper suitable for BIBO housing applications?
Yes. Because it provides a true airtight seal, a bubble tight damper is commonly specified as an isolation damper for BIBO (Bag In, Bag Out) housing systems and other containment applications where escaping air or gas is not acceptable.
Q4. Does EB Air offer a high-temperature bubble-tight damper?
Yes. EB Air’s bubble-tight dampers are built to perform in high-pressure and high-temperature applications. Contact our team for the exact temperature and pressure ratings for your project.
Q5. What housing shapes are available?
EB Air’s bubble tight isolation dampers are available in both circular and square housings, which makes them adaptable to a range of duct configurations and applications.
Q6. What materials are used in construction?
Standard construction includes a mild steel or 304 stainless steel casing, a spun galvanized or 304 stainless steel dish, a 304 stainless steel shaft, an extruded neoprene or silicone gasket, and nylon bearings.
Q7. What actuation options are available?
EB Air’s bubble tight dampers can be configured with manual, pneumatic, or electric actuation, ranging from simple ON/OFF control to full modulating control. Options include spring return, end switches, fail-safe position, and built-in thermistor with NEMA ratings, as well as manual quadrant and sprocket gear operation. Contact the factory for the right selection for your application.
BROCHURE
INSTALLATION LIST
VIDEO
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