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Double Ferrule Compression Fitting is a high-reliability connection solution widely used in instrumentation, hydraulics, semiconductor, environmental protection, pneumatics and industrial fluid systems, suitable for **1/16"~2" (2~50mm) tubing, with high sealing, vibration resistance, easy installation and maintenance and other advantages.
1. The core features of double compression joints
1. Wide range of applicable sizes
Imperial: 1/16", 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1.5", 2"
Metric: 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, 32mm, 40mm, 50mm
2. Easy to disassemble and re-fasten
The double ferrule structure (front ferrule and rear ferrule) provides a mechanical snap seal, which can be disassembled and assembled multiple times without affecting the sealing.
Compared to single ferrules or flange joints, no welding or special tools are required, and installation time is reduced by more than 50%.
3. A variety of materials and structures are available
Material: 304/316 stainless steel, brass, Hastelloy, Monel, etc.
Sealing form: metal-to-metal seal (high temperature and high pressure), PTFE/EPDM gasket (corrosion resistant).
4. Excellent reliability and performance
Pressure: Up to 10,000 psi (690 bar) for severe hydraulic, gas, and chemical applications.
Anti-vibration: The double ferrule design prevents loosening, and is suitable for vibration environments such as compressors, pumps, and engines.
2. Common types of double ferrule joints
Straight-through connectors
90° elbow
45° elbow
Tee joints
Cross connector
Tube adapters
3. Typical application industries
1. Environmental protection equipment (wet waste/solid waste/incineration plant)
Applicable Points:
Hydraulics (presses, sorters) – resistant to high pressures and vibrations.
Biogas/flue gas pipes (316L material resistant to H₂S corrosion).
Meter monitoring (CEMS sampling tube leak prevention)
2. Petrochemical industry
Applicable Points:
High temperature and high pressure reactor pipeline (Hastelloy acid resistant).
LNG is transported at low temperatures (-200°C remains sealed).
3. Semiconductors/Pharmaceuticals
Applicable Points:
High purity gas/liquid delivery (non-contaminating design).
Cleanroom equipment (FDA approved material).
Fourth, the selection guide
1. Select the material according to the medium
Water/Steam/Air: 304 stainless steel
Seawater/acid/alkali/Cl⁻: 316L stainless steel
Strong acid (sulphuric acid/hydrochloric acid): Hastelloy C276
High Temperature Oil/Hydraulic Oil: Nickel-plated stainless steel
2. Select the model according to the pressure
< 1000 psi: Standard Dual Ferrule 1000-6000 psi: High Pressure Reinforced > 6000 psi: Metal Sealed Ultra High Pressure
3. Precautions for installation
Cutting nozzle: must be flat and burr-free (use a special pipe cutter).
Preload control: Use a torque wrench to avoid being too tight or too loose.
Leak test: Do airtight/hydraulic test after installation.
5. Summary
Double compression fittings are a highly reliable and easy-to-maintain pipeline connection solution.
Ideal for:
✅ Environmental protection equipment (corrosion resistance, leakage prevention)
✅ Petrochemical industry (high pressure resistance, vibration resistance)
✅ Precision manufacturing (no pollution, high cleanliness)
✅ Semiconductors (CVD equipment, etching equipment)
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If you need specific model selection or technical parameters, we can provide working conditions such as medium/pressure/temperature for KUNGFLEX engineers to recommend for you!
