INDUSTRIES

Dufrene and Company, LLC has been proudly serving the Pulp and Paper industry for two decades offering the North Port Valve line. Our valves are specifically engineered to enhance performance in critical applications that demand reliable shutoff capabilities and long-lasting service life.

Our commitment to excellence extends to a diverse range of applications in both virgin pulp mills and the recycled paper industry. For abrasive media applications, we offer the Scavenger valve for use in pulpers, hydro purges, dethrashers, and contaminex systems. Furthermore, NPV’s Reject Chamber valves have become a trusted choice in the recycling sector and are widely utilized in cleaners, junk traps, and in pulp mills for knotter rejects and sand cleaner equipment.

North Port Valves’ innovative O-Port through-gate valve, tailored for critical scaling applications like green and white liquor processes, has been instrumental in solving operational challenges.

The perimeter-seated bi-directional knife gate valve is rapidly gaining popularity as the preferred solution among our clientele. This valve, designed to replace both uni-directional and bi-directional counterparts, streamlines inventory management and procurement processes. By adopting a standardized approach where one valve fits all, customers benefit from increased cost-effectiveness in their valve purchases.

North Port Valves (NPV) has supplied a significant number of Series 100 Uni-Directional metal and soft-seated knife gate valves for basic isolation service in water treatment facilities, given the simplicity of these applications. However, the wastewater treatment industry often requires valves that can handle more challenging heavy slurry-type applications, akin to those found in the pulp and paper industry. For these demanding wastewater treatment applications, we have found great success in replacing other valve types and lines with our Series 200 DUCO Bi-Directional cavity-free valves. The Series 200 is designed to provide bubble-tight shutoff even in the most arduous slurry and solids handling scenarios, meeting the needs of both manual and automated services.

Knife gate valves are widely utilized in coal-fired and other fossil fuel-fired power plants. We supply our valves in applications like lime slurry circulation areas within scrubbers, gypsum handling from the scrubbing process, fly ash, wet ash, and coal handling process areas. To address concerns related to corrosion or chloride stress cracking, we supply our DUCO Series 200 bi-directional knife gate valves in materials such as 317SS, 2205 Duplex steel, and 254SMO steel. Additionally, the cavity-free design of our DUCO series performs exceptionally well in demanding lime slurry transfer applications.

North Port Valves offers a comprehensive selection of valves and metallurgical options designed to withstand the challenging abrasive slurry, sludge, and process water present in diverse mining sectors. Our O-Port thru-gate knife gate valve is specifically suited for demanding abrasive and scaling environments commonly encountered in phosphate processing industries. The distinctive design, metallurgy, and full-port through-gate feature enable hydro blasting of the piping system without the need to remove the knife gate valve, resulting in time and cost savings for the end user. Our Series 250 DUCO bidirectional valve with Cone Deflector is designed for flow media with abrasives. The cone deflects the media inward and off of the soft seat. Thus, protecting the seat and maintaining bubble tight shutoff.

The plastics industry relies on high-performance knife gate valves for the handling and storage of various forms of plastic materials such as powder, pellets, and crystals. To ensure optimal shutoff and prevent material buildup that could impede valve performance, we incorporate soft seat protection through a cone deflector design. Our preferred valve for these applications is the DUCO Series 250, featuring a standard 317SS integrated cone deflector. In instances where the media is medium to highly abrasive, we utilize a 420SS cone deflector cartridge.

Depending on the type of process being used to manufacture cement there are many knife gate valve applications that require a dependable shutoff and maintenance-free knife gate valve. In this industry, we most often offer the DUCO series 200 Bi-directional valve with cone deflector in both wet and dry processes, slurry applications as well as in the finished product handling systems. They are also used in the silo storage areas and on hoppers in truck loading areas.

The applications found in these facilities are very similar to one’s in pulp and paper mills. There are difficult heavy slurry and abrasive applications that require a heavy-duty dependable valve such as our DUCO series 200 perimeter seated valve. Our DUCO reject chamber valves are used for heavy solids and abrasives. The O-Port full ported knife gate valve is used where conditions consist of very high solid content and seats must be protected from the flowing media.