Wafer Butterfly Valve PTFE Coated Seat and Disc
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Anticorrosive Wafer Butterfly Valve — WCB Body with PTFE Liner and PTFE Coated SS316 Disc
This anticorrosive wafer butterfly valve completely eliminates contact between any metallic surface and the process fluid: the WCB body is protected by a continuous PTFE liner that covers the entire interior and forms the sealing seat, and the SS316 stainless steel disc has a PTFE coating over its entire surface. The result is a valve where the corrosive fluid only touches PTFE — in neither the closed nor open position is there contact between the fluid and the metal.
This is the version with the highest chemical protection within the WCB anticorrosive butterfly valve family, and the correct choice when the fluid is aggressive enough to attack the SS316 of the disc in continuous service — fluids with high chlorides, moderate oxidizers, or acids in concentrations that would damage the disc's metal over time. For extremely aggressive fluids (HF, concentrated ClO₂, H₂SO₄ >70%), the correct solution is the anticorrosive ball valve with PFA lining →
Construction Materials
- Body: Carbon steel WCB — mechanical support structure. The metal has no contact with the fluid thanks to the PTFE liner.
- Internal liner: Continuous molded PTFE — completely covers the interior of the body and forms the peripheral sealing seat of the disc
- Disc: SS316 stainless steel with PTFE coating over its entire surface — the metal of the disc has no contact with the fluid in any opening position
- Shaft / stem: SS316 stainless steel with PTFE seals
Technical Specifications
- Mounting type: Wafer — between DIN PN10/16 or ANSI 150 flanges
- Nominal pressure: PN10 / PN16
- Operating temperature: -20 °C to +150 °C
- Available diameters: DN50 (2") to DN400 (16")
- Design standard: EN 593
- Actuator interface: ISO 5211
Comparison of the WCB anticorrosive butterfly valve family
| Variant | Body | Disc | Protection | Best for |
|---|---|---|---|---|
| WCB + PTFE liner, SS316 disc | WCB + PTFE liner | SS316 uncoated | Protected body — exposed disc | Diluted acids and alkalis where the SS316 of the disc is sufficient |
| WCB + PTFE liner, PTFE coated disc ← This product | WCB + PTFE liner | PTFE coated SS316 | Zero metal-fluid contact | Fluids that attack SS316 disc — high chlorides, oxidizers, zero metallic contamination |
Compatible Fluids
- ✅ Sulfuric acid H₂SO₄ up to 40%
- ✅ Hydrochloric acid HCl up to 35%
- ✅ Nitric acid HNO₃ up to 30%
- ✅ Phosphoric acid H₃PO₄ up to 85%
- ✅ Caustic soda NaOH up to 50%
- ✅ Sodium hypochlorite NaClO up to 15%
- ✅ Ferric chloride FeCl₃ — any concentration
- ✅ Seawater and concentrated brines at elevated temperatures
- ✅ Moderate oxidizing solutions (H₂O₂ up to 20%)
- ✅ Fluids where contamination by metallic ions from the disc is unacceptable
- ⚠️ HF, H₂SO₄ >70%, concentrated ClO₂, H₂O₂ >30%: use PFA anticorrosive valve →
Available Operation Versions
- Manual with lever: DN50 to DN150
- Manual with gear reducer: DN200 to DN400
- With pneumatic actuator: Single acting NC or NO, double acting. ISO 5211 + NAMUR. For environments with acid vapors: specify actuator with acid-resistant epoxy coating.
- With electric actuator: 24 VDC, 110 VAC, 220 VAC. ON/OFF or modulating 4–20 mA.
For the complete range of anticorrosive butterfly valves, see anticorrosive butterfly valves category →