In precision fluid control systems—whether in analytical lab setups or industrial dosing lines—the reliability and sealing performance of tubing connections are crucial. Among available options, inverted cone fittings stand out as a robust solution for connecting PTFE, PFA, or FEP rigid tubing.
1. Why Do Rigid Tubing Systems Require Specialized Fittings?
Compared to flexible tubing, rigid tubing such as PTFE and PFA offers superior chemical resistance, structural stability, and cleanliness. These properties make it ideal for:
Multi-port valve systems
Precision syringe pumps
Laboratory flow switching
Chemical process instrumentation
Such applications demand fittings that ensure both mechanical grip and leak-free sealing, something that inverted cone + compression ring structures can deliver.
2. How Inverted Cone Fittings Work: Structure & Sealing
These fittings usually comprise two parts:
A tapered (cone) base, which aligns tightly with the tubing wall
A compression ring, which exerts axial force to ensure sealing upon tightening
Benefits include:
✅ No leak caused by rigid tubing’s low elasticity
✅ Handles higher system pressure and temperature
✅ Prevents tubing slippage or loosening
3. Choosing Between PP and PTFE: Which Material to Use?
For different scenarios:
| Material | Key Features | Ideal Usage | Corrosion Resistance |
|---|---|---|---|
| PP | Low-cost, easy to machine | General lab use or neutral fluids | ❌ Not suitable for acids/alkalis |
| PTFE | Chemically inert, high purity | Strong acids, bases, aggressive solvents | ✅ Excellent resistance |
4. Real-World Example: Performance Enhancement via Inverted Cone Fittings
Case 1: A lab using a multi-port valve for organic solvent analysis experienced micro-leakage with PP fittings. Switching to PTFE inverted cone fittings resulted in better sealing and over 30% improvement in system longevity.
Case 2: In a syringe pump setup, tubing detachment occurred during high-speed cycles with push-in connectors. After upgrading to inverted cone + compression ring fittings, detachment was eliminated, and flow rate fluctuation reduced by 15%.
5. Installation Guide: How to Properly Use Inverted Cone Fittings
（Steps）：
1.Cut the rigid tubing squarely to ensure a flat, smooth end.
2.Slide the compression ring onto the tube, then insert the tube into the tapered (cone) port of the fitting.
3.Hand-tighten the compression nut until you feel resistance.
4.For final sealing, tighten an additional 1/8 to 1/4 turn—do not overtighten.
6. Strong Compatibility, OEM Customizable
These fittings are available in various sizes, compatible with different tubing outer diameters. For unique fluid systems or custom manifold valves, OEM support is also available.
7. Conclusion: Small Components for Big Impact
The reliability of a fluid system often hinges on small parts. Choosing the right inverted cone fitting ensures better sealing, greater chemical resistance, and long-term durability—especially for sensitive or corrosive environments.
📧 Reach out to request samples, datasheets—we’re here to support your rigid tubing system with the perfect connection solution.