PFA-Lined Valves for Pulp and Paper Manufacturing

Corrosion-Resistant Flow Control for Bleaching Chemicals, Chlorine Dioxide, and Fiberline Operations

Modern kraft pulp mills rely on chlorine dioxide (ClO₂) bleaching to produce bright, strong pulp while meeting environmental standards. The Elemental Chlorine Free (ECF) process—now used in over 90% of bleached kraft production—requires equipment that withstands highly oxidizing chlorine compounds, strong acids, and caustic extraction stages.

GFT9 fluoropolymer-lined valves provide the chemical resistance essential for reliable operation in pulp bleaching. With documented industry service life exceeding 10 years in chlorine dioxide applications, our valves deliver proven performance in the demanding pulp and paper environment.

Manufactured in Germany to DIN EN standards, GFT9 products serve kraft mills, paper manufacturers, and chemical preparation facilities worldwide.

View Full Product Range →

Why Pulp Bleaching Demands PFA-Lined Components

Pulp bleaching subjects equipment to some of the most aggressive chemical conditions in industrial manufacturing. The combination of oxidizers, acids, and bases creates unique challenges.

The Bleaching Environment:

Chlorine dioxide (ClO₂) is a powerful oxidizing agent used at 8-12 g/L concentrations. It aggressively attacks stainless steel and most polymers, causing rapid corrosion and material failure.

Modern bleach sequences (typically DEOPDED or similar) alternate between:
• D Stages: Acidic ClO₂ at pH 2-4, temperatures to 70°C
• E Stages: Hot caustic (NaOH) extraction at pH 10-12, temperatures to 80°C
• P Stages: Alkaline hydrogen peroxide

No single conventional material handles this full chemical cycle.

Why PFA is the Industry Choice:

PFA (Perfluoroalkoxy Alkane) provides exceptional resistance across all bleach plant conditions:

• Complete resistance to chlorine dioxide at all process concentrations
• Unaffected by caustic solutions used in extraction stages
• Handles hydrogen peroxide and other oxidizers
• Resistant to sulfuric acid used in ClO₂ generation
• Temperature capability to +180°C suits all bleaching temperatures
• Smooth surface enables complete cleaning between chemical transitions

Proven Industry Performance:

TAPPI case studies document fluoropolymer-lined equipment service life exceeding 10 years in D-stage ClO₂ service—far outperforming stainless steel alternatives that corrode within months.

Applications Across Pharmaceutical Production

Kraft pulp mills operate complex chemical processes from wood chip digestion through finished pulp. GFT9 products serve corrosion-critical functions throughout these operations.

Chlorine Dioxide Systems

ClO₂ generation, storage, and distribution represent the most demanding valve application in pulp mills. PFA-lined valves provide reliable service in:
• Generator feed systems (sodium chlorate, sulfuric acid)
• ClO₂ solution storage and transfer
• Distribution headers to bleach towers
• Safety relief and isolation systems

Bleach Plant Operations

Each bleaching stage presents different chemical challenges. PFA-lined valves handle the full range:
• D Stages: Acidic ClO₂ dosing and tower isolation
• E Stages: Caustic feed and extraction filtrate
• P Stages: Peroxide injection systems
• Stage-to-stage transfer lines

Chemical Preparation (Chem Prep)

Pulp mills typically operate internal chemical plants producing bleaching reagents. PFA-lined components serve:
• ClO₂ generators (acid feed, product handling)
• Sulfuric acid dilution systems
• Caustic preparation and distribution
• Chemical storage tank isolation

Fiberline Operations

The fiberline conveys pulp stock through washing, screening, and bleaching. Valves in filtrate systems handle weak black liquor, bleach plant filtrates, and various process streams containing dissolved organics and process chemicals.

Tall Oil Recovery

Kraft pulping produces crude tall oil as a valuable byproduct. PFA-lined valves serve separation systems where contact with acidic, organic-rich streams occurs.

PFA-Lined Products for Pulp and Paper Applications

  • PFA Lined Control Valve NPS 1½ NPS 1½ - Valve with pneumatic multi-spring actuator for fast, cost-efficient operation. - High quality industrial valve by GFT9

    PFA-Lined Ball Valves – Spheron Series

    Full-bore ball valves with complete PFA lining for reliable shut-off and flow control in bleach plant service. The Spheron series features heavy-duty bodies with thick transfer-molded PFA linings.

    Standard Series (Ductile Iron Body):
    • Sizes: DN15 to DN200
    • Pressure Rating: PN10/16
    • Temperature Range: -20°C to +180°C
    • Body: Ductile Iron GGG40.3 with epoxy exterior coating
    • Operation: Manual lever, gear operator, pneumatic or electric actuator

    Proven performance in chlorine dioxide service with documented multi-year reliability.

    View Ball Valve RangeView Control Valve Range 
  • PFA Lined Ball Check Valve NPS 8 NPS 8 - On vertical mounting up to 60°, the center-guided ball closes the valve automatically. - High quality industrial valve by GFT9

    PFA-Lined Swing Check Valves – Vibron Series

    Fully lined check valves prevent backflow in corrosive bleaching chemical service.

    • Sizes: DN25 to DN200
    • Pressure Rating: PN10/16
    • Temperature Range: -20°C to +180°C
    • Body: Ductile Iron GGG40.3
    • Design: Wafer style for compact installation

    Applications include ClO₂ pump discharge protection, chemical dosing systems, and bleach tower isolation.

    View Check Valve Range 
  • PFA Lined Sight Glass NPS_10 NPS_10 - Sight glass mounts vertically or horizontally for easy installation in any environment. - High quality industrial valve by GFT9

    PFA-Lined Strainers – Filtron Series

    T-pattern strainers with full PFA lining protect instruments and control equipment in corrosive service.

    • Sizes: DN25 to DN150
    • Pressure Rating: PN16
    • Temperature Range: -20°C to +180°C
    • Body: Ductile Iron GGG40.3
    • Screen Materials: PTFE mesh

    Essential for protecting ClO₂ analyzers, flow instruments, and control valves.

    View Strainer Range 
  • PFA Lined Strainer NPS 6 (on request) NPS 6 (on request) - Main view - High quality industrial valve by GFT9

    PFA-Lined Sight Glasses – Videron Series

    Visual monitoring of chemical flow and solution color without exposing glass to aggressive bleaching chemicals.

    • Sizes: DN25 to DN150
    • Pressure Rating: PN10/16
    • Window Material: Borosilicate glass (DIN 7080)
    • Body: Ductile Iron GGG40.3

    Applications include flow verification in chemical feed lines and level indication in storage systems.

    View Sight Glass Range 
1 4

Technical Specifications for Hydrogen Applications

Technical Specifications

Size Range (DN) DN 15 – DN 200
Size Range (NPS) ½" – 8"
Pressure Rating (DIN) PN 16
Pressure Rating (ANSI) Class 150
Temperature Range -20°C to +180°C (-4°F to +356°F)
Extended range to -60 and +200°C on request
Body Material (Standard) 1.0619 , 1.4308, 1.4408/ A216WCB, CF8-M or CF-8
Body Material (Clean Room) -
Lining Material Virgin PFA (Perfluoroalkoxy)
Lining Thickness 2.5 – 4.0 mm depending on size
Face-to-Face Standard EN 558-1
Flange Standard (DIN) EN 1092-1
Flange Standard (ANSI) ASME B16.5
Certifications PED 2014/68/EU Module A2, ISO 9001:2015, EN 12266-1, TU-LUFT, SIL
Custom Engineering Available:
Special sizes, extended temperature ratings, and custom actuation available on request.

Chemical Compatibility

Chemical Compatibility

Chemical Formula Concentration Max Temp Rating

Chlorine Dioxide

 ClO₂ Process concentrations to 12 g/L 80°C

Sodium Hypochlorite

 NaOCl All concentrations to 15% 60°C

Sulfuric Acid

 H₂SO₄ All concentrations to 98% 120°C

Sodium Hydroxide

 NaOH All concentrations to 50% 120°C

Hydrogen Peroxide

 H₂O₂ All concentrations to 50% 60°C

Chlorine (wet)

 Cl₂ Saturated 80°C

PFA provides superior service life compared to stainless steel in chlorine dioxide applications. Industry case studies document 10+ year service in D-stage bleaching. Contact us for specific ClO₂ generator and bleach plant applications.

Excellent Full resistance, suitable for continuous use Good Suitable for most applications Limited Verify for specific conditions

Quality Assurance and Documentation

Pulp mills require comprehensive documentation for process control, environmental compliance, and equipment reliability. GFT9 provides complete quality assurance packages.

Manufacturing Standards:

• Production to DIN EN standards
• Pressure testing per EN 12266-1
• Material traceability throughout production
• ISO quality management systems

Documentation Packages:

• EN 10204 Type 3.1 material certificates
• PFA material certificates with batch identification
• Pressure test certificates
• Dimensional inspection reports
• Declarations of conformity (CE marking)

Material Specifications:

Body materials: GGG40.3 (ductile iron), 1.4408 (stainless steel)
Lining: Virgin PFA, minimum 2.5mm wall thickness
Temperature range: -20°C to +180°C
Flange standards: DIN EN 1092-2, ANSI B16.5 available

Contact our technical team for application-specific documentation requirements.

Read the Full Project Story →

German Engineering for Critical Applications

  • Manufacturing Excellence:

    All GFT9 products are manufactured in Germany under strict quality control. Our facility in Kempen combines traditional valve manufacturing expertise with modern PFA lining technology, ensuring consistent quality across every component.

  • Documentation and Traceability:

    Hydrogen projects demand comprehensive documentation for safety compliance and operational records. GFT9 provides complete documentation packages including material certificates (EN 10204 3.1), test reports, declarations of conformity, and—for control valve projects—digital valve passports with QR code access to lifetime records.

  • Technical Support:

    Our engineering team understands the specific requirements of hydrogen applications. From initial specification review through commissioning support, we work alongside project teams to ensure our products meet exact application needs.

  • Flexible Delivery

    With standard products available from stock and custom solutions delivered within project timelines, GFT9 supports both urgent replacements and planned capital projects.
About GFT9

Discuss Your Pulp and Paper Requirements

Whether you're upgrading bleach plant equipment, specifying valves for a new ClO₂ generator, or sourcing maintenance spares, our technical team supports your project.

We work with:
• Pulp and paper mills
• EPC contractors and engineering firms
• Maintenance and reliability teams
• Chemical system integrators

Contact Options:

Email: sales@gft9.shop
Phone: +49 2152 9154990

We provide chemical compatibility verification and application-specific recommendations.

Request Quotation →

Collections

1 3