Description
Fluorine Lined Butterfly Valves (also known as PTFE/PFA lined butterfly valves, fluoroplastic wafer butterfly valves, or acid-resistant chemical butterfly valves) are high-performance quarter-turn isolation and flow control valves built for handling severe chemical media. Engineered with a split-body construction and a seamless virgin fluoroplastic lining fully encapsulated over the disc and body inner wall, these valves provide total protection against strong acids, corrosive gases, and toxic solvents.
Designed for compact, low-torque installation, these lined butterfly valves serve as high-capacity control devices alongside our industrial butterfly valves and integrate seamlessly into lined chemical pipelines using precision-machined industrial flanges.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Nominal Diameter Range | DN50 to DN1200 (2" to 48") |
| Nominal Pressure | PN10 / PN16 / Class 150 |
| Outer Shell Material | Ductile Iron (QT450-10), WCB (Carbon Steel), Stainless Steel (CF8 / 304 SS) |
| Lining Material Options | PTFE (Polytetrafluoroethylene) / PFA (Perfluoroalkoxy) / FEP (F46) |
| Body Structure & Ends | Split Two-Piece Body; Wafer, Lug, or Double Flanged Ends |
| Actuation Options | Manual Lever, Worm Gearbox, Pneumatic Actuator, Electric Actuator |
| Working Temperature | -20°C to 180°C (-4°F to 356°F) |
| Connection Standard | Flanged Ends (ASME B16.5 Class 150, HG/T 20592, EN 1092-1) |
| Testing & Quality Assurance | 100% Spark Test (15kV-25kV) & Hydrostatic Shell/Seat Leak Test |
Key Features & Chemical Isolation Mechanics
Safely controlling high-volume corrosive fluid lines requires advanced sealing geometry and robust liner bonding:
- Universal Corrosion Immunity: High-density PFA/PTFE lining fully encapsulates all internal body passages and disc surfaces, offering total immunity to hydrofluoric acid, nitric acid, wet chlorine gas, and strong alkalis.
- Bi-Directional Zero Leakage: The dynamic elastomeric backing energetic ring behind the PTFE seat maintains continuous radial compression, ensuring bubble-tight shut-off in both flow directions.
- Low Operating Torque & Anti-Blowout Stem: Engineered with a two-piece stem and low-friction fluoroplastic thrust bearings to minimize operating torque and prolong actuator life.
Target Applications & Industries
Our fluorine-lined butterfly valves are installed across major chemical and process facilities worldwide:
- Chlor-Alkali & Fine Chemical Plants: Acid neutralization loops, wet chlorine gas ducts, and spent acid handling.
- Flue Gas Desulfurization (FGD): Corrosive limestone slurry isolation and acidic wastewater treatment.
- Steel Pickling & Semiconductor Manufacturing: Ultra-pure chemical distribution and mixed acid recovery systems.
Frequently Asked Questions (FAQ)
Q1: What are the primary advantages of a fluorine-lined butterfly valve compared to a lined ball valve?
Lined butterfly valves offer a significantly lighter weight, shorter face-to-face dimension, and lower initial cost, especially for large pipe diameters (DN150 and above), while maintaining excellent chemical isolation.
Q2: How do you ensure the lining does not strip off under vacuum or high flow velocity?
Our body castings feature machined dovetail retention grooves. Fluoroplastics are compression molded directly into these grooves, mechanical locking the liner in place against vacuum collapse.
Q3: Can Oucang Valve automate these butterfly valves with actuators?
Yes. As a direct factory, Oucang Valve manufactures standard ISO 5211 top mounting pads for rapid connection with pneumatic or electric actuators.
About the Manufacturer: Oucang Valve
Oucang Valve is an ISO-certified direct manufacturer specializing in fluoroplastic-lined valves, chemical butterfly valves, and forged industrial pipe flanges. Operating our own casting foundry, PTFE/PFA molding workshop, and spark testing laboratory, we provide complete material traceability and custom OEM engineering for global projects.
- Core Capability: Precision PFA/PTFE lining injection, 15kV-25kV spark testing, custom butterfly valve production, and rapid direct export.
- Quality Compliance: ASME B16.5, HG/T 21562, EN, DIN, and ISO standards.
- Factory Inquiry: Contact our engineering sales team for direct factory quotations, chemical resistance charts, and 2D/3D CAD drawings.
