Setting the industry standard for explosion safety
 

Explosion safety is non-negotiable when designing or operating dry bulk solids systems. That’s why the National Fire Protection Association created NFPA 69, a strict set of requirements to prevent and control explosions in enclosures where flammable materials are present.

Many rotary valves on the market meet compliance through prescriptive requirements, forcing engineers and integrators to compromise on design and performance. At DMN-WESTINGHOUSE, we take a different approach. Since 1981, our rotary valves have been subjected to the most extensive explosion testing in the industry. We’ve conducted hundreds of real-world explosion tests, allowing us to certify rotary valves through a performance-based methodology. The result is both NFPA 69-compliant and ATEX Directive 2014/34/EU certification, with greater flexibility that goes beyond traditional U.S. specifications.
 

With 75+ years of expertise and 7,000 rotary valves manufactured annually, we are deeply familiar with the challenges and needs of dry bulk solids handling industries.

What sets our rotary valves apart?

Our rotary valves are engineered to deliver certified explosion protection without compromising on design freedom or system performance. This makes them a powerful asset not just for system integrators and OEMs, but also for end users across operations, engineering, safety, and maintenance.

Whether you're designing a new system or optimizing an existing one, our rotary valves offer added value by improving safety, simplifying integration, and reducing long-term wear and maintenance:
 

• Clearance up to 0.4 mm (0.016 in) – no material blockage required, reducing wear and thermal expansion risks.

• Blades in metal or polyurethane, can be fitted with scraper, chamfered, or additional knifes.

• Bearings configured inboard or outboard, depending on sealing and process needs.

• Use for organic dusts (St 1, 2 & 3)

• Kst-Values up to 380 bar x m/s

• P-max values up to 10 bar

• Rotating speed of the rotors up to 30 rpm

• Certification – based on explosion testing, validated by notified bodies, and compliant with both NFPA 69 and ATEX 2014/34/EU

These features allow broader application, smoother integration, and better long-term performance without sacrificing certified explosion safety.

See for yourself

Unlike most manufacturers, we don’t rely on assumptions. Our rotary valves are tested for blocking flame passage and explosions under various configurations and conditions to confirm that a system is genuinely safe during an explosion. Our testing program is verified by notified bodies and designed to reflect real-world conditions and use cases.
Watch how our rotary valves perform under real explosion scenarios.

Discover the full scope of our performance-based approach to NFPA 69 compliance in the white paper.

DMN-WESTINGHOUSE has been a leader in the design and manufacture of high-end rotary valves and diverter valves since 1950. Our innovative, future-proof solutions are trusted by global industries, from food and pharmaceuticals to plastics and biomass. By continuously pushing the boundaries of engineering and design, we help our customers meet the highest standards of safety, hygiene, reliability, and efficiency in their production processes.   With headquarters in the Netherlands, a global network of sales offices and sales reps, and a dedicated team of experts, DMN-WESTINGHOUSE offers tailored solutions and unparalleled support to ensure process continuity for our customers worldwide.