Overview
Anhui Xinfulong's Flanged Lined Butterfly Valves are engineered for reliable flow control in corrosive, high-purity, and demanding chemical applications. Featuring a full fluoropolymer lining — available in PFA, FEP, or PTFE — these valves completely isolate the metal body from the process medium, providing exceptional resistance to strong acids, alkalis, organic solvents, and ultra-pure chemicals.
The valve incorporates a lined disc with a spherical sealing surface and a precision-engineered seat design, delivering bubble-tight shutoff with low operating torque-. Available with manual lever, gear operator, or pneumatic/electric actuation, our flanged lined butterfly valves offer versatile flow control solutions for a wide range of industrial applications-.
Flanged end connections provide secure, leak-free installation and easy integration into existing piping systems, making these valves the ideal choice for pipelines where metal valves are unsuitable and zero leakage is critical.
Key Features
Superior Corrosion Resistance
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Full fluoropolymer lining (PFA/FEP/PTFE) on all wetted parts — inner cavity, disc, and seat — completely isolates the metal body from the process medium
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Chemically inert to virtually all acids, alkalis, solvents, and aggressive chemicals
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Resistant to sulfuric acid, hydrofluoric acid, phosphoric acid, chlorine gas, strong caustics, aqua regia, and most organic and inorganic acids and bases-
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Exceptional resistance to permeation and microbial contamination
Bubble-Tight Shutoff
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Precision-engineered seat design ensures zero-leakage sealing performance
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Bidirectional sealing capability with 360° seat energizer provides reliable shutoff in both flow directions
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Self-adjusting sealing pressure: when medium pressure is low, contact area is smaller for higher sealing pressure; when pressure is high, contact area increases to prevent seat damage
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Low friction coefficient between disc and seal minimizes operating torque
Flanged Connection Design
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Flanged end connections (ANSI, DIN, JIS, GB standards) ensure secure, leak-free installation-
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Easy to install, remove, and maintain without special tools
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Available in wafer, lug, and double-flanged configurations
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Standardized face-to-face dimensions per API 609, EN 558, and ISO 5752
Versatile Operation
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Available with manual lever handle, worm gear operator, or pneumatic/electric actuators-
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Quick quarter-turn operation (90° rotation) for fast open/close or flow regulation-
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Suitable for both isolation and throttling service
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Low torque operation reduces actuation force requirements
Low Maintenance & Long Service Life
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Split body design allows for easy disassembly and maintenance
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Non-stick surface properties prevent scale and sludge buildup
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Self-lubricating PTFE lining reduces friction and wear
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Maintenance-free operation under normal conditions
Wide Temperature & Pressure Range
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Temperature range: -40°C to +200°C (depending on operating pressure)
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Pressure rating up to 16 bar (Class 150)
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Suitable for vacuum service down to 1 mbar absolute
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PTFE can withstand high temperatures up to 260°C and remains tough at temperatures as low as -195°C
Safety Features
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Dual shaft sealing with primary and secondary seals ensures zero external leakage
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Blow-out proof stem design prevents accidental ejection under pressure
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Anti-static design available for flammable service
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Optional fire-safe design for critical applications
Technical Specifications
Actuation Options
Applications
Our Flanged Lined Butterfly Valves are widely deployed across industries requiring corrosion-resistant and high-purity flow control:
Semiconductor Manufacturing
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High-purity chemical distribution systems
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Wet etching and wafer cleaning processes
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Ultra-pure water (UPW) systems
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Ultrafiltration and reverse osmosis systems
Wet Electronic Chemicals
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Transfer and control of high-purity acids, solvents, and etchants
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Chemical blending and distribution systems
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High-purity reagent feed lines
Chemical & Petrochemical Processing
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Handling of strong acids (sulfuric, hydrochloric, nitric, hydrofluoric)
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Caustic soda and alkaline solutions
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Organic solvents and aggressive media
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Chlorine production and chlor-alkali processes
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Pickling and plating lines
Pharmaceutical & Biotech
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High-purity fluid transfer with zero contamination risk
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Solvent and reagent delivery systems
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FDA-compliant processing lines
New Energy
Water & Wastewater Treatment
Food & Beverage
Why Choose Xinfulong Flanged Lined Butterfly Valves?
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Superior Corrosion Protection — Full fluoropolymer lining (PFA/FEP/PTFE) on all wetted parts provides chemical resistance superior to expensive alloys and far outlasts standard metal valves in corrosive service
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Zero Leakage Performance — Bubble-tight sealing with precision-engineered seat design ensures zero internal and external leakage, critical for environmental safety and product purity
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Bidirectional Shutoff — 360° seat energizer with concentric disc design enables reliable sealing in both flow directions
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Flanged Connection Security — Standardized flanged end connections provide secure, leak-free installation and easy maintenance
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Versatile Actuation — Available with manual, gear, pneumatic, or electric actuation to suit any application requirement
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Low Maintenance — Split body design allows for easy disassembly and service; self-lubricating lining reduces wear and extends service life
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Cleanroom Manufacturing — Critical production processes carried out in Class 1000/10,000 cleanrooms, ensuring the highest levels of purity
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Industry-Leading Expertise — Backed by decades of fluoropolymer processing experience and R&D collaboration with Japanese and Korean experts
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Proven Global Track Record — Trusted by clients across Europe, Japan, Korea, Taiwan (China), and beyond
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Comprehensive Quality Assurance — ISO 9001, ISO 14001, ISO 45001 certified with full in-house testing capabilities
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End-to-End Service — From custom design and material selection to manufacturing, testing, and after-sales support
Customization Options
We offer fully customizable flanged lined butterfly valves to meet your specific requirements:
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Valve sizes from DN50 to DN600
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Lining materials: PFA, FEP, or PTFE
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Body materials: ductile iron, cast steel, or stainless steel
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Connection types: flanged (ANSI, DIN, JIS, GB), wafer, lug
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Body types: wafer, lug, or double flanged
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Actuation: manual lever, worm gear, pneumatic, or electric
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Control options: on/off or modulating
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Feedback devices: limit switches, position transmitters
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Anti-static design for flammable service
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Fire-safe design for critical applications
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FDA-compliant grades for pharmaceutical applications
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Special trim materials and configurations
