Description
Fluorine Lined Diaphragm Valves (also known as PTFE/PFA lined diaphragm valves or acid-resistant membrane valves) are versatile flow control and isolation valves engineered for handling toxic chemicals, aggressive acids, and abrasive slurry streams. By utilizing a flexible fluoroplastic diaphragm to completely seal off the upper bonnet assembly and operating mechanism from the line fluid, these valves eliminate stem packing leaks and prevent media contamination.
Designed for severe corrosive duty and slurry handling, these lined diaphragm valves operate seamlessly alongside our industrial butterfly valves and integrate directly into plastic and metal piping loops using precision-forged industrial flanges.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Nominal Diameter Range | DN15 to DN250 (1/2" to 10") |
| Nominal Pressure | PN6 / 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) / PO |
| Diaphragm Material | PTFE + EPDM Dual-Layer Composite Construction |
| Flow Pattern Options | Weir Type (Low Torque Throttling) / Straight-Through Type (Full Flow) |
| Working Temperature | -20°C to 150°C (-4°F to 302°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 & Diaphragm Sealing Mechanics
Controlling aggressive or slurry-laden streams requires a robust packingless sealing architecture and flexible fluoroplastic barrier:
- Zero Stem Leakage (Packingless Design): The flexible composite diaphragm isolates the operating mechanism completely from the process fluid, eliminating traditional stem packing wear and fugitive emissions.
- Dual-Layer PTFE/EPDM Diaphragm: Combines a virgin PTFE chemical face for universal corrosion resistance with a reinforced EPDM rubber backing for high dynamic flexibility and long flex life.
- Excellent Slurry & Viscous Media Handling: Free of internal crevices or dead pockets, preventing solids buildup, clogging, or media crystallization in severe chemical loops.
Target Applications & Industries
Our fluorine-lined diaphragm valves are deployed across hazardous fluid processing and mining chemical loops:
- Chlor-Alkali & Acid Processing: Hydrochloric acid neutralization, sulfuric acid transfer, and wet chlorine treatment.
- Water Treatment & Desalination: Demineralized water treatment, acid/alkali regeneration lines, and chemical dosing.
- Mining & Chemical Slurry Pipelines: Acid leaching fluids, abrasive slurries, and hazardous effluent disposal.
Frequently Asked Questions (FAQ)
Q1: What is the difference between Weir Type and Straight-Through Type lined diaphragm valves?
Weir Type valves feature an internal raised weir that reduces diaphragm flex stroke, extending diaphragm life and providing precise flow regulation. Straight-Through Type valves offer a full, unobstructed flow passage ideal for heavy slurries and viscous liquids.
Q2: How do you prevent internal pinholes in the lining?
Every fluorine-lined diaphragm valve body undergoes a 15kV–25kV high-voltage spark test prior to assembly to ensure zero pinholes or micro-fractures in the fluoroplastic layer.
Q3: Can Oucang Valve equip pneumatic actuators on lined diaphragm valves?
Yes. As a direct factory, Oucang Valve supplies double-acting and spring-return pneumatic actuators with positioners for automated chemical dosing.
About the Manufacturer: Oucang Valve
Oucang Valve is an ISO-certified direct manufacturer specializing in fluoroplastic-lined valves, chemical diaphragm valves, and forged industrial pipe flanges. Operating our own casting foundry, PTFE/PFA molding workshop, and high-voltage spark testing laboratory, we supply complete material traceability and custom OEM engineering for global process projects.
- Core Capability: Precision PFA/PTFE lining injection, high-voltage spark testing, custom diaphragm valve fabrication, 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.
