Description
Fluorine Lined Gate Valves (also known as PTFE/PFA lined chemical gate valves or acid-resistant wedge gate valves) are full-bore isolation valves designed for bi-directional shut-off in highly corrosive fluid, acid, and slurry pipelines. Featuring a seamless virgin fluoroplastic lining and an encapsulated wedge disc, these gate valves isolate metallic body components completely from process media, delivering zero-leakage performance under severe chemical working conditions.
Engineered for low-pressure drop and reliable line isolation, these lined gate valves work seamlessly alongside our industrial butterfly valves and integrate directly into fluoroplastic piping networks using precision-forged industrial flanges.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Nominal Diameter Range | DN25 to DN600 (1" to 24") |
| 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) |
| Structure & Stem Type | Flexible Wedge Gate / OS&Y Rising Stem / Non-Rising Stem |
| 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) & Shell/Seat Hydrostatic Pressure Test |
Key Features & Chemical Isolation Mechanics
Isolation of strong acids, alkalis, and organic chemicals demands uncompromising lining integrity and robust mechanical seating:
- Universal Chemical Resistance: Virgin PTFE/PFA lining completely covers all wetted body channels and the wedge disc, resisting all concentrations of hydrofluoric acid, hydrochloric acid, sulfuric acid, and aqua regia.
- 100% Full-Port & Minimal Pressure Drop: Unobstructed full-bore design allows straight-through media flow without turbulence or flow restriction, reducing pumping energy consumption.
- Vacuum & Permeation Resistant Molding: Mechanical dovetail grooves cast into the metallic body lock the fluoroplastic lining securely in place, preventing lining collapse under full vacuum or thermal cycling.
Target Applications & Industries
Our fluorine-lined gate valves are widely installed across chemical process isolation zones:
- Chlor-Alkali & Acid Production: Concentration tracking, acid recovery lines, and hazardous fluid transfer.
- Pharmaceutical & Fine Chemicals: Solvent distillation, bulk acid handling, and reaction vessel outlets.
- Semiconductor & Steel Pickling: Ultra-pure chemical piping, waste acid treatment, and electroplating loops.
Frequently Asked Questions (FAQ)
Q1: Can fluorine-lined gate valves be used for flow throttling?
No. Gate valves are designed strictly for on/off full-bore isolation. Operating them in a partially open position for throttling can cause fluid erosion across the fluoroplastic wedge seat.
Q2: How is the lining quality verified prior to shipment?
Every fluorine-lined gate valve undergoes a 15kV–25kV high-voltage electrostatic spark test to ensure zero pinholes or lining flaws, followed by strict hydrostatic pressure testing.
Q3: Can Oucang Valve equip gate valves with electric or pneumatic actuators?
Yes. As a direct factory, Oucang Valve can provide top mounting flanges for electric multi-turn actuators or pneumatic actuators for automated plant control.
About the Manufacturer: Oucang Valve
Oucang Valve is an ISO-certified direct manufacturer specializing in fluoroplastic-lined valves, chemical gate valves, and forged pipe flanges. Operating our own casting foundry, PTFE/PFA molding workshop, and pressure testing laboratory, we supply full material certification and custom OEM engineering for global projects.
- Core Capability: Precision PFA/PTFE lining injection, high-voltage spark testing, custom gate valve manufacturing, 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.
