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North Port Valves (NPV) has been serving the Pulp and Paper industry for 20 years with high quality knife gate valve designs for the purpose of improving performance in critical applications requiring dependable shutoff and longevity of service.

In addition to supplying North Port Valves for many applications in Virgin Pulp Mills, we have also carved out a large market with the recycled paper industry. In applications requiring scavenger valves, we provide 3”-30” on the pulpers, hydro purge, dethrashers, and contaminex. North Port Vavles’ HD/MD reject cleaner valves are also being widely used throughout the recycling industry and in pulp mills on knotter rejects equipment. 

North Port Valves’ O-Port special designed through gate valve is solving the problems in critical scaling applications such as green and white liquor.

Our DUCO series 200 perimeter seated bi-directional knife gate valve is quickly becoming the standard value of choice by many of our customers replacing the need for having to inventory or buy both uni-directional and bi-directional knife gate valves. Standardizing on one valve fits all, makes valve purchases much more cost-effective.

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WATER & Waste Water

North Port Valves (NPV) has supplied a significant number of Series 100, Uni-Directional, metal & soft seated knife gate valves for basic isolation service in water treatment facilities as these applications are fairly simple. However, the wastewater treatment industry can and does require valves capable of handling much more difficult, heavy slurry-type applications that are more similar to ones found in the pulp & paper Industry. For these wastewater treatment applications, we are having much success replacing other types and valve lines with our Series 200 DUCO Bi-Directional, cavity-free valves. The Series 200 will achieve bubble-tight shutoff even in the most difficult of slurry and solids handling applications, both in manual and automated required services.

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Knife gate valves are being used in large quantities in coal-fired or other fossil fuel-fired power plants. Typical applications where our knife gate valves are being used are in the lime slurry circulation areas in scrubbers, gypsum created in the scrubbing process, fly ash, wet ash, and coal handling process areas. We have furnished the DUCO series 200 bi-directional knife gate valves in materials such as 317SS, 2205 Duplex steel, and 254SMO steel where there are issues of corrosion or chloride stress cracking. Also, the cavity-free design of our DUCO series works extremely well in heavy lime slurry transfer applications.

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North Port Valves has a complete range of valves and metallurgy choices that will handle many of the tough abrasive slurry, sludge, and process water used throughout the various mining industries. North Port Valves’ O-Port thru gate designed knife gate valve is especially applicable and performs well in heavy abrasive and scaling applications typically found in phosphate process industries. Our unique design, metallurgy, and full port through gate allow for hydro blasting of the piping system without requiring removal of the knife gate valve, thus saving time and money for the end-user.

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In the plastics industries where the movement and storage of powder, pellets, crystals, and other forms of plastic materials requires a high-performance knife gate valve. The soft seat protection by use of a cone deflector gives the proper shutoff and eliminates the material collecting and preventing the knife gate valve from performing as expected. The typical valve we use in these applications is the DUCO Series 200 with either a standard 317SS cone deflector or in cases where the media may be abrasive we use a hardened material to handle the abrasion and extend the life of the perimeter seat.

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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 the truck loading facilities

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The applications found in these facilities are very similar to pulp and paper mill applications. 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.