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Delta Ducon

Beyond Ordinary: Why Delta Ducon's Extreme Rotary Valves Are the Top Choice for Cement, Mining, and Minerals

In the demanding world of cement, mining, and mineral processing, robust and reliable equipment is crucial. Pneumatic conveying systems form the backbone of these industries, and at the heart of these systems lies a critical component: the rotary valve. Choosing the right rotary valve can significantly impact efficiency, maintenance costs, and ultimately, your bottom line.

While the market offers various options, Delta Ducon's Extreme Rotary Valves stand out as a superior choice. Let's explore what sets them apart:




Silo feeding into a rotary valve


Built for the Toughest Challenges


Delta Ducon understands the harsh realities of cement, mining, and mineral processing. Abrasive materials, high temperatures, and demanding operating conditions are the norm. That's why the Extreme Rotary Valves are engineered to thrive in these environments.    


  • Unrivaled Durability:  The core of the Extreme Rotary Valve is its P-33 alloy rotor and inlet wear shoe. This special chrome-iron alloy boasts a hardness of 550-600 Brinell, ensuring exceptional wear resistance and extended service life.  Unlike surface-hardened components that wear down over time, the P-33 alloy is solid cast, maintaining its robust properties throughout its lifespan.   

  • Heavy-Duty Construction:  From the robust cast iron housing to the extreme duty shaft (eliminating the need for shear pins), every component is built to withstand the rigors of heavy-duty applications.    

  • Adaptability:  Available in a range of sizes (6" to 24"), the Extreme Rotary Valves can be configured as rotary feeders or airlocks, providing flexibility to meet your specific needs.    


Maintenance Made Easy


Downtime is costly. Delta Ducon's Extreme Rotary Valves are designed with ease of maintenance in mind, minimizing downtime and maximizing productivity.


  • Field Adjustable:  A unique design feature allows for easy adjustment between the rotor and the seal shoe, ensuring an optimal seal throughout the valve's life. This adjustment can be performed in place, reducing maintenance time and effort.    

  • Easy Access:  Four inspection ports provide convenient access for monitoring and maintenance, simplifying upkeep and troubleshooting.    

  • Multiple Shaft Seal Options:  Choose from various shaft seal options to suit your specific application and further enhance the valve's performance and longevity.    


The Delta Ducon Difference


Delta Ducon has been a trusted name in bulk material handling for over 100 years. The Extreme Rotary Valve is a testament to our commitment to engineering excellence and customer satisfaction.


  • A Legacy of Innovation:  The PERMA/flo Extreme Rotary Valve has been a customer favorite since 1964, and we have continuously refined and improved its design to meet the evolving needs of our customers.    

  • Engineered for Performance:  The unique design of the "XT" series, introduced in 2003, features an increased throat size for enhanced capacity and efficiency.    

  • Quality and Reliability:  Delta Ducon's commitment to quality is unwavering. Each Extreme Rotary Valve is manufactured to the highest standards, ensuring long-lasting performance and reliability.


When it comes to handling abrasive materials in cement, mining, and mineral processing, Delta Ducon's Extreme Rotary Valves are the clear choice. Their robust construction, ease of maintenance, and commitment to quality ensure optimal performance and minimize downtime, making them a valuable asset for any operation.

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