Pulp and Paper

The kraft process, also known as kraft pulping, is a widely used method in the paper and pulp industry for converting wood into pulp, which is the essential raw material for papermaking. This process involves boiling wood chips in a mixture of sodium hydroxide (NaOH) and sodium sulfide (Na2S) under high temperature and pressure. The chemicals break down the lignin, a natural polymer that binds wood fibers together, while leaving the cellulose fibers largely intact. Once the lignin is dissolved and removed, the resulting pulp can be bleached and processed into paper products.

Elite Valve specializes in providing customized solutions for corrosive, high pressure, and demanding process applications that help our customers improve their process reliability and productivity.

Typical Applications

  • Chip washers
  • Chemical handling
  • White/Green/Black liquor handling
  • Steam
  • Boiler feedwater

Pulping

Pulping is a critical process in the pulp and paper industry, where raw materials such as wood, recycled paper, or agricultural residues are transformed into pulp. This pulp serves as the primary raw material for paper production. The pulping process involves breaking down the lignin that binds cellulose fibers together in the raw materials, typically through mechanical, chemical, or semi-chemical methods. Mechanical pulping grinds the raw material into pulp, whereas chemical pulping uses chemicals like sulfurous acid or sodium hydroxide to dissolve the lignin. Semi-chemical pulping combines both methods to optimize fiber quality and yield. This process results in a fibrous mass that can be further processed into various types of paper products, ranging from newsprint to high-quality writing paper.

  • Chlorine handling
  • Rinsing
  • Steam
  • Pulp transport

Bleaching

Bleaching is an essential process in the pulp and paper industry aimed at improving the brightness, whiteness, and purity of the pulp. After pulping, the pulp still contains residual lignin and other impurities that can impart a brownish color. The bleaching process removes these substances, enhancing the visual and physical properties of the final paper product. Traditional bleaching methods often involve the use of chlorine-based chemicals, but due to environmental concerns, there has been a significant shift towards chlorine-free or elemental chlorine-free (ECF) methods. These alternatives, such as oxygen, ozone, and hydrogen peroxide bleaching, are more environmentally friendly and reduce the release of harmful chlorinated compounds into the environment. Bleaching is crucial for producing high-quality paper products, such as printing and writing papers, where brightness and clarity are paramount.

  • Recycled paper feed
  • Rejects
  • Cyclone separators
  • Sludge handling

Recycling

Recycling in the pulp and paper industry involves the reprocessing of waste paper and paper products to produce new paper. This process not only conserves natural resources by reducing the demand for virgin wood but also decreases the environmental impact by minimizing waste and energy consumption. The recycling process typically starts with the collection and sorting of waste paper, followed by pulping, where the waste paper is mixed with water and chemicals to break it down into fibers. Contaminants such as inks, adhesives, and coatings are removed through deinking and cleaning processes. The resulting recycled pulp can be blended with virgin pulp to enhance the quality of the final product or used independently to produce recycled paper products. Recycling is a vital component of sustainable practices in the pulp and paper industry, promoting resource efficiency and environmental stewardship.

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E5400
General Purpose KGV

Robust resilient or metal seated valve, with many options, to suit industrial and municipal applications.

  • Uni/bidirectional, resilient or metal seat
  • Stainless steel or high alloy body
  • 150psi max pressure/MSS SP-81
  • 2” to 60” (larger on request)
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E5600
High Performance
Class 150 KGV

Fully customizable for severe service applications in the Pulp & Paper, Mining & Mineral Processing, Chemical, and Oil & Gas industries.

  • Bidirectional, perimeter seat, transverse seal design
  • WCB, stainless steel or high alloy body
  • Class 150/MSS SP-135
  • 2” to 24” (larger on request)
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E5700
Aggressive Process Class 150 KGV

Specifically designed for high wear, industrial, and Pulp & Paper recycling applications.

  • Unidirectional, hardened seat ring
  • Stainless steel or high alloy body
  • Class 150/MSS SP-135
  • 2” to 24” (larger on request)
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E9800
High Performance
Class 150 O-Port KGV

Fully customizable for severe service applications involving dry or high consistency materials in the Pulp & Paper, Chemical, and Mining industries.

  • Through conduit, transverse seal design
  • Class 150 / MSS SP-135
  • 2” to 24” (larger on request)
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High Performance Class 150/300 BFV

For high pressure, high temperature, and high cycle applications in industrial process industries.

  • RTFE or metal seat
  • Stainless or carbon steel body
  • Up to 285psi
  • 2” to 24”

Pulping

Elite Valve products are meticulously designed to meet the rigorous demands of pulping applications, including chip washers, chemical handling, and the management of white, green, and black liquor, as well as steam and boiler feedwater systems. For chip washers, Elite Valve provides robust, corrosion-resistant valves that ensure reliable performance in the abrasive and high-pressure environment. Chemical handling valves are constructed with materials that resist the aggressive chemicals used in the pulping process, such as sodium hydroxide and sulfurous acid. For handling various liquors, Elite Valve’s products offer precision control and durability to manage the complex chemical compositions and varying temperatures. Additionally, Elite Valve’s steam and boiler feedwater valves are engineered to withstand high temperatures and pressures, ensuring efficient and safe operation of steam generation and boiler systems.

Bleaching

Elite Valve’s products are specially designed to handle the demanding conditions of the bleaching process in the pulp and paper industry. When dealing with chlorine and other bleaching agents, Elite Valve offers valves that provide superior resistance to corrosion and chemical attack, ensuring long-term reliability and safety. For rinsing operations, Elite Valve’s valves maintain consistent flow control and prevent contamination, essential for achieving high-quality pulp. Steam valves from Elite Valve are engineered to handle the high temperatures and pressures associated with bleaching, ensuring efficient steam distribution and usage. Additionally, for pulp transport, Elite Valve supplies durable, high-performance valves that ensure smooth and reliable movement of pulp through the bleaching process, minimizing downtime and maximizing productivity.

Recycling

In recycling applications, Elite Valve products are designed to handle the unique challenges associated with recycled paper feed, rejects, cyclone separators, and sludge handling. Valves for recycled paper feed are built to accommodate the varied and sometimes abrasive nature of recycled materials, ensuring consistent and reliable flow. For managing rejects, Elite Valve offers solutions that efficiently handle contaminants and impurities, maintaining smooth operation and preventing blockages. Cyclone separator valves are designed to manage high velocities and separation processes, providing robust and reliable performance. In sludge handling, Elite Valve provides valves that can handle the thick, viscous nature of sludge, offering durability and resistance to wear and corrosion, ensuring efficient and trouble-free operation in demanding recycling environments.