The PFA / FEP Lined Butterfly Valve is the ultimate solution for high-volume flow control of highly corrosive, toxic, and ultra-pure media. Designed for industries where standard metallic or rubber-lined valves would fail within weeks, these valves feature a robust body—typically Ductile Iron or Stainless Steel—fully encapsulated in a thick, high-integrity fluoropolymer liner.
By isolating the valve body and stem from the process fluid, the PFA (Perfluoroalkoxy) or FEP (Fluorinated Ethylene Propylene) lining ensures that the media only ever touches chemically inert surfaces, providing a lifetime of reliable service in the world's harshest chemical environments.
Lined Options: PFA vs. FEP:-
Selecting the right liner is essential for maximizing the ROI of your piping infrastructure:
- PFA Lined (Heavy-Duty): Known for its superior melt strength and thermal stability. It is the preferred choice for high-temperature applications (up to 200°C) and environments where permeation resistance is critical.
- FEP Lined (General Corrosive): An economical alternative that offers near-universal chemical resistance. Best suited for temperatures up to 150°C, it provides a smooth, non-stick surface ideal for preventing media buildup.
Key Features & Benefits:-
- Universal Corrosion Protection: Virtually immune to all known chemicals, including strong acids (H2SO4, HCl), oxidizers, and aggressive solvents.
- Bubble-Tight Bi-Directional Seal: The wide, resilient liner acts as both the seat and the flange gasket, ensuring a 100% leak-proof shut-off from either flow direction.
- Two-Piece Body Design: Most models feature a split-body construction, allowing for easy replacement of the liner and disc without discarding the entire valve housing.
- Low Operating Torque: The naturally low coefficient of friction of PFA/FEP allows for smooth rotation, reducing the wear on actuators and lowering automation costs.
- Streamlined Disc Profile: Precision-lined discs are designed to minimize turbulence and pressure drop while maintaining maximum structural strength.
- ISO 5211 Actuator Mounting: Standardized top flange allows for direct mounting of Pneumatic or Electric Actuators, making it ideal for automated chemical dosing and treatment plants.
Technical Specifications:-
| Feature |
Specifications |
| Size Range |
2" to 24" (DN50 – DN600) |
| Body Styles |
Wafer, Lugged, or Double Flanged |
| Body Materials |
Ductile Iron (ASTM A395), WCB (Cast Steel), CF8M (316 SS) |
| Lining Materials |
PFA (Standard), FEP (Optional) |
| Pressure Ratings |
ANSI Class 150, PN10, PN16 |
| Temperature Range |
-29°C to 200°C (Dependent on liner material) |
| Stem Design |
One-piece or Two-piece Anti-Blowout Stem |
Target Industrial Applications:-
PFA / FEP Lined Butterfly Valves are the "safety anchors" for corrosive fluid routing:
- Chemical & Petrochemical: Handling concentrated acids, bases, and volatile organic compounds (VOCs).
- Pharmaceutical & Biotech: Managing high-purity fluids and aggressive cleaning agents in sterile environments.
- Desalination & Water Treatment: Reliable isolation for seawater intake and chemical filtration skids.
- Pulp & Paper Mills: Withstanding the corrosive effects of bleaching chemicals and heavy liquors.
- Semiconductor Manufacturing: Ensuring metal-ion-free fluid transport for ultra-pure water and etching chemicals.
Why Choose Lined Butterfly Valves over Alloy Valves?
Exotic metals like Tantalum or Hastelloy are effective but come with astronomical costs and long lead times. The PFA / FEP Lined Butterfly Valve provides a cost-effective, high-performance alternative that often outperforms metal in acidic service. With its lightweight design and ease of maintenance, it is the most efficient choice for large-diameter corrosive pipelines.
