Description
Fluorine Lined Tetrameters (also known as PTFE/PFA lined 4-way cross fittings or lined equal crosses) are specialized heavy-duty pipe fittings designed for multi-directional distribution of highly corrosive, acid, and alkali fluids. Featuring a seamless virgin fluoroplastic lining molded securely inside a rigid ductile iron or carbon steel shell, these 4-way cross fittings eliminate fluid leakage and prevent pipeline contamination in severe chemical process lines.
Engineered for ultimate corrosion resistance, these lined fittings work seamlessly alongside our industrial butterfly valves and link directly into fluoroplastic piping loops 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 | PTFE (Polytetrafluoroethylene) / PFA (Perfluoroalkoxy) / FEP (F46) |
| Lining Thickness | 3.0 mm to 6.0 mm (Customizable upon request) |
| 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 | 100% Spark Test (15kV-25kV Spark Testing) & Hydrostatic Test |
Key Features & Advanced Lining Technology
Transporting aggressive acids and organic solvents requires high-integrity fluoroplastic protection:
- Universal Chemical Resistance: Virgin PTFE/PFA lining resists virtually all strong acids (hydrochloric, sulfuric, nitric, and hydrofluoric acid), organic solvents, and strong oxidizing agents across a broad temperature range.
- High Vacuum & Permeation Resistance: Molded with high-density fluoroplastics and mechanical locking grooves inside the metallic shell, preventing lining collapse under vacuum or elevated temperatures.
- Seamless Four-Way Flow Distribution: Integrally molded internal geometry reduces fluid turbulence, minimizes dead zones, and ensures leak-free flanged connections at all four ports.
Target Applications & Industries
Our fluorine-lined tetrameters are widely used in toxic, corrosive, and ultra-pure fluid handling:
- Fine Chemical & Petrochemical: Acid regeneration, chlor-alkali processing, and organic solvent manifolds.
- Pharmaceutical & Fine Chemicals: High-purity acid delivery, reactor piping loops, and corrosive media distribution.
- Semiconductor & Electroplating: Pickling acid lines, ultrapure chemical transfer, and hazardous waste treatment.
Frequently Asked Questions (FAQ)
Q1: What is the difference between PTFE and PFA lining for cross fittings?
PTFE offers excellent general chemical inertness and temperature resistance up to 180°C. PFA provides melt-processable molding, offering smoother internal surfaces, higher transparency/purity, and superior resistance to vacuum and permeation.
Q2: How is the lining quality verified before shipment?
Every fluorine-lined tetrameter undergoes rigorous quality inspections, including a 15kV–25kV high-voltage electrostatic spark test to ensure zero pinholes or lining flaws, followed by shell hydrostatic pressure testing.
Q3: Can Oucang Valve manufacture custom flange standards or reducing 4-way crosses?
Yes. As a direct factory, Oucang Valve manufactures equal and reducing fluorine-lined tetrameters with custom center-to-face dimensions and ANSI/DIN/JIS companion flanges.
About the Manufacturer: Oucang Valve
Oucang Valve is an ISO-certified direct manufacturer specializing in fluoroplastic-lined valves, lined pipe fittings, and forged industrial flanges. Operating our own casting workshop, PTFE/PFA molding facility, and non-destructive testing lab, we supply full material traceability and custom engineering for chemical projects globally.
- Core Capability: Precision PFA/PTFE lining injection, high-voltage spark testing, custom 4-way cross fabrication, and rapid direct export.
- Quality Compliance: ASME B16.5, HG/T 21562, EN, DIN, and ISO standards.
- Factory Inquiry: Contact our engineering team for factory-direct quotes, corrosion compatibility charts, and 2D/3D CAD drawings.
