ISO 90° Elbows for Vacuum System: High-Conductance Right-Angle Turns for Large Vacuum Lines

Product Description

ISO 90° elbows for vacuum system are precision-engineered, bent tubular fittings designed to redirect gas flow by 90 degrees while maintaining high-vacuum integrity from atmospheric pressure down to 10⁻⁹ Torr. Also known as ISO right-angle bends or quarter-turn fittings, these components feature ISO-K or ISO-F flanges on both ends and a smooth, continuous internal radius for optimal flow characteristics.

Manufactured from high-quality 304L or 316L stainless steel, ISO 90° elbows are essential for vacuum chambers, pumping systems, transfer lines, and industrial process equipment where space constraints or system layouts require perpendicular directional changes. They conform to internationally recognized ISO 1609, ISO 2861, and Pneurop 6606 standards. Unlike KF fittings which are limited to smaller diameters (up to DN50), ISO 90° elbows are available for nominal diameters from DN63 through DN630, making them the standard choice for medium and large-scale high-vacuum and ultra-high vacuum (UHV) systems. Whether you need to route a pumping line around structural obstacles, connect offset components, or design a compact manifold, these elbows deliver the conductance, reliability, and flexibility that demanding applications require.

Key Features & Characteristics

• Bend Angle: 90 degrees (standard)

• Bend Radius: Long radius (1.5× DN) – standard for maximum conductance

• Flange Types: ISO-K (clamp with centering ring) or ISO-F (bolted)

• Vacuum Range: Atmospheric to 1×10⁻⁹ Torr (UHV compatible with metal seals)

• Nominal Diameters (DN): DN63, DN80, DN100, DN160, DN200, DN250, DN320, DN400, DN500, DN630

• Material: 304L or 316L Stainless Steel (low carbon, UHV compatible)

• Internal Surface Finish: Ra ≤ 0.8 µm (electropolished or mechanically polished)

• Outgassing Rate: < 2×10⁻⁸ Torr·L/s·cm² (after vacuum cleaning)

• Leak Integrity: Helium leak tested to < 1×10⁻⁹ mbar·L/s

• Bakeout Capability: Up to 400°C (ISO-F with metal seals)

Applications

• Vacuum pumping lines: Redirecting roughing and high-vacuum lines around obstacles

• Large-scale coating systems: Semiconductor, optical, and decorative PVD

• Thin-film deposition: Sputtering, evaporation, and ALD system plumbing

• Space simulation chambers: Thermal vacuum system interconnections

• Research beamlines: Synchrotron and particle accelerator vacuum systems

• Industrial vacuum processing: Metallizing, heat treatment, and drying systems

• ISO-K to ISO-F transitions: Converting between clamp and bolted standards

• Compact manifold design: Creating space-efficient vacuum assemblies

• Load lock systems: Routing lines between chambers at different elevations

• Cryogenic systems: Liquid nitrogen and helium transfer lines

Why Choose Our ISO 90° Elbows for Vacuum Systems?

We combine precision CNC tube bending, orbital welding, and electropolishing to deliver ISO 90° elbows that meet or exceed international vacuum standards. Every elbow is helium leak tested, ultrasonically cleaned with semiconductor-grade detergents, and double-bagged in a cleanroom environment. Short radius configurations, mixed flange types, reducing options, and UHV-grade finishes (metal seal ready, Ra ≤ 0.4 µm) are available with engineering support.