Description

Technical Data Sheet: Fully PTFE Lined Wafer Type Butterfly Valve (JIS 10K)

1. Product Description

This is a wafer-type concentric butterfly valve with a fully PTFE (Polytetrafluoroethylene) internal lining. Both the valve body interior and the disc are completely encapsulated with white PTFE material, ensuring absolute isolation of all metallic components from the process fluid. It is designed for highly corrosive chemical media, high-purity fluids, and general industrial piping systems. Compliant with JIS 10K flange standards, the wafer connection offers a compact, lightweight, and cost-effective installation. The valve provides bi-directional zero-leakage sealing. The exterior features a black epoxy resin coating for durability and an aesthetic industrial appearance.

2. Technical Specifications

3. Materials of Construction

4. Performance Data

• Operating Temperature: -10°C to +150°C (PTFE material property; short-term peak up to 180°C)

• Maximum Working Pressure: 10 bar (JIS 10K standard)

• Leakage Class: Bi-directional Zero Leakage (API 598 / JIS B2003)

• Suitable Media:

  • Strong acids (Sulfuric, Hydrochloric, Nitric, etc.)

  • Strong alkalis, strong oxidizers

  • Organic solvents, chemical media

  • High-purity fluids, pharmaceutical/food-grade media

  • Seawater, FGD slurry, etc.

• Vacuum Service: Consult manufacturer

• Lining Integrity Test: 100% High Voltage Spark Test performed on every valve to ensure a pinhole-free lining

5. Pressure-Temperature Ratings

(PTFE Lined, JIS 10K)

Note: The pressure-temperature rating of PTFE decreases as temperature rises. Final values are subject to manufacturer confirmation.

6. Key Features

• Full PTFE Isolation: The body and disc are completely encapsulated with white PTFE, leaving zero metal contact with the media. Suitable for almost any corrosive medium except molten alkali metals and elemental fluorine.

• Integrated Seamless Seat: The PTFE lining forms the seat in one continuous piece, eliminating seams and the risk of lining delamination or permeation leakage.

• Bi-directional Sealing: The PTFE resilient seat paired with a polished disc ensures bubble-tight shut-off in both flow directions.

• Wafer-Type Design: Compact, lightweight, and space-saving. Installed between two flanges, reducing piping space and installation costs.

• Low Torque Operation: PTFE’s extremely low friction coefficient, combined with self-lubricating bearings, results in low operating torque and smooth operation.

• Blow-out Proof Stem: Stem design incorporates a positive safety step, ensuring safe operation.

• ISO 5211 Mounting Pad: Top flange complies with ISO 5211 standards, allowing direct mounting of various actuators.

• Product Appearance: Black epoxy-coated body with white PTFE lining. The lever handle features a locking notch plate for intuitive, secure operation and a clean, professional look.

7. Precautions & Notes

1. Media Compatibility: PTFE offers excellent resistance to most chemical media, but is not suitable for molten alkali metals and elemental fluorine.

2. Installation: For wafer-type installation, ensure the valve is properly centered between the two flanges. Tighten bolts evenly and symmetrically to prevent uneven stress on the lining.

3. Pipe Flushing: Flush the pipeline before installation to remove weld slag and debris, preventing damage to the PTFE lining.

4. Storage: Store in a cool, dry place, protected from direct sunlight and heavy objects. Keep the disc in a slightly open position.

5. Operating Limits: Avoid media containing hard solid particles, as they may scratch the PTFE lining.