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90° KF (QF) HV Radius Elbows

90° KF (QF) HV Radius Elbows

90° KF (QF) HV Radius Elbows are precision-engineered components used in high-vacuum (HV) and ultra-high-vacuum (UHV) systems. These elbows are designed to provide smooth and efficient directional changes in vacuum lines, ensuring optimal gas flow and minimizing the potential for turbulence and pressure loss.

Key Features

  • Material: Constructed from high-quality stainless steel (304L or 316L), offering excellent durability, corrosion resistance, and minimal outgassing, making them perfect for vacuum applications.

  • Compact Radius Design: The 90° bend radius is designed for applications where space is limited, yet performance cannot be compromised.

  • KF (QF) Flange Connection: Equipped with ISO-KF (QF) fittings, allowing for easy and reliable connections to other vacuum components without the need for welding.

  • Leak-Tight Seal: Ensures secure, leak-free operation in both HV and UHV environments, crucial for maintaining system integrity.

  • High-Performance: Designed to maintain optimal gas flow and minimize pressure drops, these elbows are ideal for high-performance vacuum systems.

Applications

  • Semiconductor Manufacturing: Used in processes like thin film deposition, plasma etching, and ion implantation, where smooth vacuum lines are essential for precision.

  • Research Laboratories: Important for systems requiring stable and clean vacuum conditions, such as in particle accelerators, spectroscopy, or electron microscopes.

  • Vacuum Coating and Sputtering: Essential for industries like optics, electronics, and solar panel production where high-quality vacuum systems are crucial for material deposition.

  • Industrial Systems: Suitable for applications in aerospace, pharmaceuticals, and chemical processing where reliable vacuum performance is required.

Why Choose TFM’s 90° KF (QF) HV Radius Elbows?

  • Reliable Leak-Free Operation: Engineered for secure, airtight connections.

  • Durable Construction: Made with high-purity stainless steel for maximum longevity and resistance to corrosion.

  • Efficient Gas Flow: Designed to minimize pressure loss and turbulence for improved system performance.

  • Flexible Sizing: Available in various diameters and configurations to meet custom vacuum system requirements.

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Wall Thickness Part Number
KF16 (1.18" OD) Elbow, 90 Degree Radius 304L SS Tooltip 3/4 0.065 QF16-075-E90
KF25 (1.57" OD) Elbow, 90 Degree Radius 304L SS Tooltip 1 0.065 QF25-100-E90
KF40 (2.16" OD) Elbow, 90 Degree Radius 304L SS Tooltip 1-1/2 0.065 QF40-150-E90
KF50 (2.95" OD) Elbow, 90 Degree Radius 304L SS Tooltip 2 0.065 QF50-200-E90

Accessories Table

Description For Per Package Part Number
Cast Clamps (SS) KF10, KF16 Flanges 1 QF16-075-CS
Cast Clamps (SS) KF25 Flanges 1 QF25-100-CS
Cast Clamps (SS) KF40 Flanges 1 QF40-150-CS
Cast Clamps (SS) KF50 Flanges 1 QF50-200-CS
Cast Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-C
Cast Clamps (Aluminum) KF25 Flanges 1 QF25-100-C
Cast Clamps (Aluminum) KF40 Flanges 1 QF40-150-C
Cast Clamps (Aluminum) KF50 Flanges 1 QF50-200-C
Lever Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-CHA
Lever Clamps (Aluminum) KF25 Flanges 1 QF25-100-CHA
Lever Clamps (Aluminum) KF40 Flanges 1 QF40-150-CHA
Centering Ring (SS with Fluorocarbon O-Ring) KF10 Flanges 1 QF10-050-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF16 Flanges 1 QF16-075-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF25 Flanges 1 QF25-100-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF40 Flanges 1 QF40-150-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF50 Flanges 1 QF50-200-SRV
Description For Per Package Part Number

 

 

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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