PTFE Lined Pipe Fittings
1.Virgin PTFE or PFA liner with 100% pure fluoropolymer for universal chemical resistance to acids, solvents, and oxidizing agents.
2.Isostatic molding process for complex geometries (Tees, Crosses) ensuring uniform liner wall thickness at all interior curves and branch intersections.
3.Compression tight-lining process for straight spools and large-radius standard elbows with maximum liner-to-shell contact area.
4.Full-vacuum rated with mechanical interlock design preventing liner collapse under negative pressure service.
5.100% spark tested at 10–15KV ensuring zero pinholes or thin spots in the fluoropolymer lining.
6.Carbon Steel (WCB/A105) or Stainless Steel (CF8/CF8M/SS304/SS316L) shell options with ANSI/DIN flange drills.
7.DN15–DN600 (1/2″–24″) with PN10/PN16/Class 150 pressure ratings and custom configurations available.
8.PFA upgrade option for extreme thermal cycling, full vacuum, or high-particulate abrasive service conditions.
PTFE Lined Pipe Fittings
DEVEL PTFE Lined Pipe Fittings are premium-grade fluoropolymer-lined components engineered for the most severe corrosive fluid transmission environments where conventional metallic or rubber-lined equipment simply cannot survive. Built on a foundation of decades of specialized expertise in isostatic molding and compression tight-lining processes, our manufacturing facility produces a comprehensive spectrum of lined fittings covering standard Elbows, Tees, Crosses, Reducers (Concentric and Eccentric), Instrument Tees, and Blind Flanges in sizes ranging from DN15 (½”) up to DN600 (24″).
Each fitting combines a heavy-duty external structural shell — available in Carbon Steel (WCB/A105) or Stainless Steel (CF8/CF8M/SS304/SS316L) — with a mathematically precise, seamless internal liner of high-density virgin Polytetrafluoroethylene (PTFE) or Perfluoroalkoxy (PFA). This dual-material architecture delivers exceptional chemical resistance capable of withstanding virtually all aggressive media including concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, strong nitric acid, reactive alkalis, powerful oxidants, and highly active organic solvents — remaining immune to degradation under extreme parameters.
Our advanced anti-permeation technology utilizing high-molecular-weight modified PTFE materials significantly reduces micro-permeation rates of small molecules, preventing corrosive vapors from attacking the parent metal framework and dramatically extending operational lifespan. Specialized tight-lining engineering with mechanical locking-grove configurations ensures excellent full-vacuum resistance, meaning the liner does not experience collapse, deformation, or detachment even under sudden thermal shifts accompanied by high vacuum states.
These products are deployed across critical severe-service sectors including chemical processing plants, pharmaceutical synthesis facilities, semiconductor manufacturing cleanrooms, microelectronics production lines, petrochemical refining operations, metallurgical pickling lines, industrial water treatment systems, food-grade process piping, and any application demanding absolute corrosion-free fluid containment.
Key Features at a Glance
- Ultimate Chemical Resistance Performance
Virgin PTFE / PFA liners withstand virtually all aggressive chemicals: concentrated sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, strong nitric acid, reactive alkalies, powerful oxidants, and organic solvents. Immune to degradation except molten alkali metals and elemental fluorine. - Dual Structural Shell Options
Carbon Steel (WCB, A105) for general industrial service per GB/T 12229 / ASTM A216, or Stainless Steel (CF8, CF8M, SS304, SS316L) for elevated purity and secondary corrosion defense per ASTM A351. Full ANSI, DIN, and JIS flange standards supported. - Broad Thermal Operating Range
Standard operating temperature from −60°C up to +200°C (−76°F to +392°F), maintaining flawless mechanical integrity and anti-corrosive characteristics under severe continuous thermal cycling conditions. - Advanced Anti-Permeation Technology
High-density, high-purity, high-molecular-weight modified PTFE materials drastically reduce micro-permeation rates of small-molecule media. Prevents corrosive vapors from attacking the parent metal housing, extending external steel lifespan by years. - Full-Vacuum Resistance & Mechanical Interlock
Specialized tight-lining engineering with mechanical locking-groove configurations imparts excellent resistance against full negative vacuum pressures. Liner remains stable without collapse, deformation, or detachment during sudden thermal shifts under vacuum states. - Two Proprietary Molding Processes
Isostatic Molding Process: Optimized for geometrically complex fittings (Tees, Crosses, manifolds) ensuring uniform wall thickness across all interior curves. Compression Tight-Lining Process: Engineered for straight spools and large-radius elbows, guaranteeing tight rigid adhesion to inner shell surface for exceptional long-term resistance against thermal shock and violent temperature cycling. - High-Voltage Spark Testing Quality Assurance
Every fitting undergoes 10KV–15KV DC High-Voltage Non-Destructive Testing with zero breakdown points guaranteed. Compliant with HG/T 21562, HG/T 4085, and ASTM F1545 spark testing standards. - PFA Upgrade Option for Critical Service
For applications involving rapid thermal fluctuations, continuous full-negative vacuum, or severe particulate abrasion — PFA Molded Lined Fittings are recommended. PFA retains identical universal chemical immunity while delivering enhanced structural creep resistance, superior anti-permeation metrics, and exceptional thermal vacuum stability.
Key Technical Advantages
Exceptional Chemical Inertness
The PTFE/PFA liner provides near-universal chemical compatibility. From concentrated mineral acids to aggressive organic solvents, chlorinated compounds to caustic bases, the fluoropolymer barrier remains unaffected. This eliminates the need for frequent replacement cycles that plague traditional alloy piping in corrosive service, reducing total cost of ownership and eliminating unplanned shutdown events caused by corrosion-related leaks.
Seamless Integration Between Shell & Liner
Our advanced isostatic molding and compression tight-lining processes ensure mathematically precise, seamless integration between the heavy-duty carbon steel or stainless steel structural armor and the internal high-purity fluoropolymer liner. No gaps, no delamination risk points, no thin spots on complex curves. The result is a monolithic composite component that behaves as one unified piece under pressure, temperature cycling, and mechanical stress.
Vacuum-Safe Design Architecture
Unlike basic loose-lined products that collapse under vacuum, our mechanically interlocked tight-lining system maintains full structural integrity even at deep vacuum pressures. The engineered groove-locking mechanism physically anchors the PTFE liner to the metal substrate, preventing inward buckling during pump-down cycles, steam-out cleaning procedures, and sudden condensation events that create momentary vacuum spikes.
Complete Product Coverage
Every common pipe fitting geometry is available in PTFE lined configuration: 90° and 45° Elbows (standard and long radius), Concentric & Eccentric Reducers, Equal & Reducing Tees, Crosses (4-way), Instrument Tees with take-off branches, Blind Flanges, Spool Pieces, and custom fabrications. One-stop sourcing eliminates interface mismatch risks when building complete corrosion-resistant piping systems.
Technical Specifications & Material Characteristics
| Inspection Item | Technical Indicators | Corresponding Standard |
|---|---|---|
| Housing Material Type | Carbon Steel (WCB, A105) or Stainless Steel (CF8, CF8M, SS304, SS316L) | GB/T 12229 / ASTM A216 / ASTM A351 |
| Lining Material | High-Density, High-Purity Virgin Poly tetrafluoroethylene (PTFE / PFA) | ASTM D4894 / ASTM D3307 |
| Nominal Diameter Range | DN15 — DN600 (Nominal Size: 1/2″ — 24″ Inches) | GB/T 12221 / ASME B16.10 / ASME B16.5 |
| Spark Testing Voltage | 10KV — 15KV DC High-Voltage Non-Destructive Testing, zero breakdown points | HG/T 21562 / HG/T 4085 / ASTM F1545 |
| Design Working Pressure | PN10 / PN16 / Class 150 (Custom configurations available for higher-pressure systems) | GB/T 9119 / ASME B16.5 |
Technical Specification & Dimension Chart
Detailed physical sizing specifications and standard parameter matrices for heavy-duty PTFE lined pipe fitting components:
| Size (inch) | Size (mm) | ID (mm) | RF (mm) | OD (mm) | PCD (mm) | No. of Holes × Dia | Lining Std. (mm) | Lining Vacuum (mm) | Length Max. (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 20.15 | 50.8 | 50.8 | 108 | 79.4 | 4 × Ø15.9 | 3.2 | 3.5 | 3000 |
| 1.5 | 33.9 | 73 | 73 | 127 | 98.4 | 4 × Ø15.9 | 3.2 | 3.5 | 3000 |
| 2 | 45.5 | 92.1 | 92.1 | 152.4 | 120.7 | 4 × Ø19 | 3.5 | 4.6 | 3000 |
| 2.5 | 55.68 | 104.8 | 104.8 | 177.8 | 139.7 | 4 × Ø19 | 3.5 | 4.8 | 3000 |
| 3 | 70.9 | 127 | 127 | 190.5 | 152.4 | 4 × Ø19 | 3.5 | 5 | 3000 |
| 4 | 94.3 | 157.2 | 157.2 | 228.6 | 190.5 | 8 × Ø19 | 4 | 5.8 | 3000 |
| 6 | 114.1 | 215.9 | 215.9 | 279.5 | 241.3 | 8 × Ø22.2 | 5 | 6.8 | 3000 |
| 8 | 195.1 | 269.9 | 269.9 | 342.9 | 298.5 | 8 × Ø22.2 | 5 | 7.9 | 2000 |
| 10 | 247.4 | 323.9 | 323.9 | 406.4 | 362 | 12 × Ø25.4 | 5 | 8.8 | 2000 |
| 12 | 297 | 381 | 381 | 482.6 | 431.8 | 12 × Ø25.4 | 5 | 9 | **** |
Note: Devel size of PTFE lined pipe fittings shown in the table is considered standard. If any different size or length is required, please contact Devel for customized specifications.
Fabrication & Molding Classifications
Isostatic Molding Process
Specially suited for geometrically complex and multi-directional flow configurations such as Tees, Crosses, and various customized complex piping manifolds. This engineering methodology ensures completely uniform liner wall thickness across all interior curves and branch intersections, avoiding thin spots and eliminating concentrated internal stress points that could cause premature failure during thermal expansion cycles. The isostatic pressure applied equally from all directions creates a flawless seamless PTFE lining that perfectly mirrors the intricate internal geometry of the fitting.
Compression Tight-Lining Process
Engineered specifically for straight pipe spools and large-radius standard elbow configurations. This method guarantees that the fabricated fluoropolymer liner clings tightly and rigidly to the prepared inner carbon or stainless steel wall surface, providing spectacular long-term resistance against thermal shock and violent temperature cycling. The compression-formed bond delivers maximum contact area between PTFE and metal, minimizing the risk of liner movement or separation under extreme operating conditions.
Engineering Guideline — Critical Application Upgrade Recommendation
For critical industrial applications subject to complex, severe combined working environments — specifically those involving rapid high-thermal fluctuations, continuous full negative vacuum states, or fluid streams carrying severe particulate abrasion — it is highly recommended to upgrade to premium PFA Molded Lined Fittings. PFA liners retain the identical universal chemical immunity of PTFE while delivering significantly enhanced structural creep resistance, superior anti-permeation metrics, and exceptional thermal vacuum stability that outperforms standard PTFE in these extreme edge-case conditions.
Typical Applications
Pharmaceutical Synthesis
Semiconductor Manufacturing
Microelectronics Production
Petrochemical Refineries
Metallurgical Pickling Lines
Industrial Water Treatment
Chlor-Alkali Production
Acid Transmission Systems
Food & Beverage Processing
Fine Chemical Manufacturing
Waste Gas Scrubbing Systems
Product Tags
PFA Lined Pipe Fittings
Lined Elbows
Lined Tees
Lined Reducers
Lined Crosses
Fluoropolymer Lined
Corrosion Resistant
Acid Resistant
Chemical Processing
Vacuum Rated
Isostatic Molding
Spark Tested
ANSI Flange
DIN Flange
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