The PTFE-lined butterfly valve is an industrial valve specifically designed for highly corrosive media. By lining the valve body and disc interior with PTFE (polytetrafluoroethylene) or fluororubber, it isolates the media from metal components, providing exceptional corrosion resistance.
Key Features
1. Corrosion Resistance
Material Advantage: PTFE offers outstanding chemical stability, resisting strong corrosive agents like concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid, and aqua regia, even at high temperatures.
Example: In the chlor-alkali industry, PTFE-lined valves reliably control chlorine and hydrochloric acid, extending service life 3–5 times longer than standard valves.
Temperature Range: Standard PTFE lining operates at -20°C to 160°C. Special models (e.g., FEP-lined) can handle -50°C to 180°C, meeting high-temperature demands.
2. Sealing Performance
Soft Seal Design: The seat and disc use fluoroplastics or rubber seals, achieving zero leakage through precise geometry (e.g., double-offset, triple-offset designs).
Example: In pharmaceuticals, PTFE-lined valves ensure non-toxic, contamination-free operation, critical for drug safety.
Bidirectional Sealing:
Forward Flow: Higher pressure tightens the seal.
Reverse Flow: Fluoroplastics' elasticity maintains sealing, preventing leaks.
3. Ease of Operation
Quick Opening/Closing: The disc rotates 0°–90°, enabling full operation in seconds, boosting efficiency.
Compact & Lightweight: Easy to install and maintain, ideal for space-constrained piping systems.
Working Principle: Precision in Rotation & Flow Control
1. On/Off Control
Open (90° rotation): Full flow path, unrestricted media passage.
Closed (0° rotation): Disc seals against the seat, blocking flow.
2. Flow Regulation
Linear Control: Disc angle correlates linearly with flow rate (e.g., 30° for partial flow, 60° for higher flow).
Automation Compatibility: Works with electric/pneumatic actuators for proportional control, integrating with DCS/PLC systems for high-precision applications.
Applications
Chemicals: Handling aggressive acids and alkalis.
Pharmaceuticals: Ensuring sterile, contaminant-free processes.
Food & Semiconductors: Meeting ultra-high purity standards.
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