Full PFA Lined Butterfly Valve-ASTM A395

Description

Full PFA Lined Butterfly Valve – ASTM A395 Ductile Iron, Full PFA Lined

Model: PFA-BFV-DI-FULL
Product Description: High-performance, full PFA (perfluoroalkoxy) lined butterfly valve with a ductile iron body conforming to ASTM A395. The design features a completely encapsulated disc and shaft, integrated PFA liner covering all wetted surfaces, and a one-piece anti-blowout stem. Suitable for aggressive acids, alkalis, and ultra-pure fluids.

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1. Main Design Codes and Standards

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2. Main Technical Parameters

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3. Pressure-Temperature Ratings (Full PFA Lined Valve)

Ratings limited by the mechanical strength of the PFA lining and the ASTM A395 ductile iron body at temperature. Maximum working pressure is given for the lined assembly.

Note: These are typical values for full PFA lined butterfly valves. Actual PFA lining thickness (≥3 mm) ensures full vacuum resistance (up to 1 bar abs) across the entire temperature range. For continuous high-temperature operation, please consult factory for specific PFA grade and service life recommendations.

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4. Materials of Main Parts

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5. Dimensions & Weight – Typical Example (Wafer Style, DN80 / 3″ PN10/16)

For other sizes, the typical wafer face-to-face dimensions (ISO 5752 short) are:

• DN50: 43 mm

• DN65: 46 mm

• DN100: 52 mm

• DN125: 56 mm

• DN150: 56 mm

• DN200: 60 mm

• DN250: 68 mm

• DN300: 78 mm
  Complete dimensions and weights for lug-body or larger sizes available upon request.

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6. Performance Testing

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7. Full PFA Lining & Design Features

• Full Wetted-Surface Protection: All parts in contact with the medium — body interior, disc, and shaft — are completely encased with PFA of uniform thickness (≥ 3 mm). There is no exposed metal inside the flow path.

• Exceptional Chemical Resistance: PFA is virtually inert to almost all chemicals, including concentrated acids (sulfuric, hydrochloric, nitric), alkalis, solvents, and ultra-high-purity water (UPW). It combines the properties of PTFE with superior melt-processability, resulting in a dense, non-porous lining.

• Anti-Blowout Stem: The one-piece shaft is fitted from inside the body and secured by a retaining ring, providing a positive mechanical stop. Even if the gland is completely removed, the stem cannot be ejected by pressure.

• Vacuum Resistance: The thick PFA liner is mechanically anchored into the ductile iron body and designed to withstand full vacuum (-1 bar) up to the valve’s maximum rated temperature, preventing liner collapse or delamination.

• Bubble-Tight Shut-Off: The flexible PFA liner is molded with an integrated lip seal. The fully PFA-encapsulated disc compresses against this lip, creating a reliable, bidirectional, zero-leakage seal.

• No Cavities: The smooth, seamless PFA surface eliminates crevices and dead spaces where media could accumulate, making the valve suitable for high-purity and crystallizing services.

• Low Torque & Actuator Ready: The PTFE/PFA bearings and the non-stick PFA surface ensure low and consistent operating torque over the valve’s life. The ISO 5211 top flange allows direct mounting of any standard pneumatic, electric, or hydraulic actuator.

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8. Application Scope

• Suitable Media: Highly corrosive acids (HCl, H₂SO₄, HNO₃, HF), mixed acid, strong bases, aggressive solvents, chlorine-based chemicals, ultra-pure deionized water, and abrasive chemical slurries.

• Temperature Range: -29 °C to +180 °C (continuous), up to +200 °C for short periods.

• Industries: Chemical processing, petrochemical, pharmaceutical, pulp & paper, steel pickling, water treatment, semiconductor.

• Key Advantages:

  • Full PFA lining eliminates any risk of corrosion to the metallic body, ensuring long service life even with aggressive media.

  • Ductile iron body (ASTM A395) provides high structural strength, pressure-tight integrity, and is more economical than full stainless steel or exotic alloys.

  • Lined butterfly valve is lighter and more compact than fully lined ball or plug valves of the same size, simplifying installation and automation.

  • Suitable for both on/off and throttling service (with appropriate actuator).

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9. Optional Configurations & Accessories

• Body Style: Lug-type with threaded inserts (ideal for dead-end service) or Wafer.

• Stem Extension: For insulated pipelines or high-temperature service (keeps actuator away from hot zone).

• Anti-Static Design: Conductive PFA lining or a secondary metal contact to ensure electrical continuity between disc, shaft, and body.

• Oxygen Service Cleaning: Degreased, cleaned, and bagged per CGA G-4.1.

• Actuators: Complete assembly with pneumatic double-acting or spring-return actuators, electric actuators (modulating or on/off), complete with solenoid valves and limit switches.

• Gearbox with Locking Device: Handwheel lockable in any position.

• Clean Service / FDA Compliant Lining: PFA material can be specified to meet FDA regulations for food/pharmaceutical contact.

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Disclaimer: This technical data sheet is provided as an engineering reference based on general industry practice for fully PFA lined butterfly valves. All specific performance data, dimensions, temperature-pressure ratings, and material certifications must be verified against the manufacturer’s official certified documentation and approved drawings before selection, installation, or use.