PVDF LINED BUtterfly Valves

These valves with Polyvinylidene Fluoride (PVDF) lining significantly improves their performance, durability, and application range.

Corrosion Resistance

Smooth Flow Path

Lightweight Design

Cost-Effective Alternative

Versatile Actuation Options

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Understanding Butterfly Valves and Their Components

Before diving into the advantages of PVDF linings, it’s important to understand the primary components of a butterfly valve:

  1. Valve Body: The main housing that connects to the pipeline and contains the internal components. It must withstand internal pressures and resist environmental factors.
  2. Disc: A circular component that rotates within the valve body to open or close the flow passage. The disc is crucial as it comes into direct contact with the fluid.
  3. Stem (Shaft): Connects the actuator or handle to the disc, transmitting the torque needed to rotate the disc.
  4. Seat: Provides a sealing surface between the disc and the valve body to prevent leakage when the valve is closed. The seat often incorporates a lining material for enhanced sealing and corrosion resistance.
  5. Actuator or Handle: The mechanism used to operate the valve, which can be manual (lever or gear-operated) or automated (electric, pneumatic, or hydraulic actuators).
  6. Lining: A protective layer applied to the internal surfaces of the valve body, disc, and sometimes other components, enhancing resistance to corrosion, abrasion, and chemical attack.

 

PVDF Material Advantages

PVDF is a high-performance thermoplastic fluoropolymer known for:

  • Excellent Chemical Resistance: Withstands a wide range of aggressive chemicals, acids, bases, and solvents.
  • High Purity: Low leachable contaminants, ideal for high-purity applications.
  • Thermal Stability: Operates effectively across a broad temperature range (-40°C to +140°C).
  • Mechanical Strength: Offers durability and resistance to wear and abrasion.
  • UV and Weather Resistance: Suitable for outdoor installations without degradation.

Unique Features of PVDF-Lined Butterfly Valves

  1. Corrosion Resistance: The PVDF lining protects the valve’s internal components from corrosive media, extending the valve’s lifespan.
  2. Smooth Flow Path: The lining creates a smooth surface, reducing turbulence and pressure drop.
  3. Lightweight Design: PVDF-lined valves are lighter, simplifying installation and reducing support requirements.
  4. Cost-Effective Alternative: Offers a balance between performance and cost, providing an economical solution.
  5. Quick Operation: The quarter-turn action allows for rapid opening and closing requiring swift flow control.
  6. Versatile Actuation Options: Compatible with manual levers, gearboxes, or automated actuators.

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Benefits Specific to PVDF-Lined Butterfly Valves

PDVF Diagram

1. Enhanced Chemical Compatibility

  • Broad Resistance: Suitable for acids like hydrochloric acid, alkalis like sodium hydroxide, and organic solvents.
  • Process Integrity: Minimizes the risk of chemical reactions between the valve material and the media.

2. Improved Operational Efficiency

  • Low Torque Requirements: The smooth PVDF surface reduces friction between the disc and seat, requiring less force to operate.
  • Energy Savings: Reduced actuation force leads to lower energy consumption in automated systems.

3. Application Flexibility

  • Temperature Resilience: Maintains integrity in processes ranging from cryogenic temperatures to elevated temperatures up to +140°C.
  • Pressure Handling: Suitable for a range of pressures commonly encountered in industrial piping systems.

4. Hygienic Design

  • Non-Adherent Surface: The PVDF lining resists biofilm formation and scaling, crucial for sanitary applications.
  • Easy Cleaning: Supports CIP (Clean-In-Place) and SIP (Sterilization-In-Place) processes.

5. Environmental and Safety Compliance

  • Fire Safety: PVDF has flame-retardant properties, contributing to safer operation.
  • Regulatory Approvals: Meets standards like FDA compliance for food contact and NSF/ANSI 61 for drinking water systems.

Applications of PVDF-Lined Butterfly Valves

Chemical Industry

  • Acid and Alkali Handling: Ideal for transferring aggressive chemicals used in manufacturing processes.
  • Chemical Dosing Systems: Precise control in adding chemicals to reactions or treatments.

Water and Wastewater Treatment

  • Disinfection Processes: Managing chlorine and other disinfectants.
  • Corrosive Effluent Management: Handling treated water with residual chemicals.

Pharmaceutical and Biotechnology

  • High-Purity Water Systems: Ensuring contamination-free transport of purified water.
  • Process Fluid Control: Managing sensitive fluids in drug manufacturing.

Food and Beverage Industry

  • Hygienic Fluid Handling: Suitable for liquids where taste and purity are essential.
  • Cleaning Solutions: Withstanding caustic cleaning agents used in sanitation.

Semiconductor Manufacturing

  • Ultra-Pure Water Distribution: Preventing contamination in microchip production.
  • Chemical Delivery Systems: Safe handling of high-purity chemicals.

    Selecting the Right PVDF-Lined Butterfly Valve

    Considerations for choosing the appropriate valve include:

    • Chemical Compatibility: Match the valve’s materials with the specific chemicals in your process.
    • Temperature and Pressure Requirements: Ensure the valve can handle your operating conditions.
    • Actuation Method: Decide between manual (lever or gearbox) and automated (electric or pneumatic) operation based on control needs.
    • Seal Material: Select compatible seal materials (e.g., EPDM, FKM) that offer the necessary chemical resistance.
    • Size and Connection Type: Choose the correct valve size and connection type (wafer, lug, or flanged) for your piping system.

    Installation and Maintenance Tips

    • Proper Alignment: Ensure the valve is correctly aligned during installation to prevent undue stress on the stem and disc.
    • Torque Specifications: Follow manufacturer torque recommendations for flange bolts to avoid deforming the valve body or compromising the lining.
    • Regular Inspections: Check for signs of wear, corrosion, or damage, particularly in harsh operating conditions.
    • Clean-In-Place Compatibility: Utilize the valve’s ability to be cleaned without disassembly if your process requires it.

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