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90° KF (QF) HV Long Radius Elbows

90° KF (QF) HV Long Radius Elbows

90° KF (QF) HV Long Radius Elbows are specialized vacuum components designed to facilitate smooth 90-degree directional changes in high-vacuum (HV) and ultra-high-vacuum (UHV) systems. Featuring a longer bend radius, these elbows help maintain the gas flow without introducing turbulence, ensuring efficient performance in a variety of vacuum applications.

Key Features

  • Material: Constructed from high-quality stainless steel (304L or 316L), offering excellent durability, corrosion resistance, and minimal outgassing, ensuring reliability in demanding environments.

  • Long Radius Design: The longer radius ensures a gentler bend, minimizing flow restrictions, turbulence, and pressure drops compared to standard elbows.

  • KF (QF) Flange Connection: Compatible with ISO-KF (QF) vacuum fittings, allowing for quick, secure connections with no need for welding.

  • Leak-Tight Performance: Precision machining and welding ensure airtight seals, ideal for HV/UHV environments where minimizing leaks is crucial.

  • Custom Sizes: Available in various sizes to accommodate specific system requirements, with customizable configurations upon request.

Applications

  • Semiconductor Fabrication: Used in deposition systems, etching, and plasma processing chambers to maintain smooth gas flow and minimize contamination.

  • Vacuum Coating Systems: Essential for sputtering and thin-film deposition in industries like optics, electronics, and solar cell manufacturing.

  • Research & Laboratory Equipment: Ideal for mass spectrometry, accelerator chambers, and other high-vacuum or UHV systems requiring a consistent gas flow.

  • Industrial Applications: Suitable for chemical processing, aerospace, pharmaceutical, and other industrial sectors relying on high-vacuum systems.

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

  • Gentle bend minimizes gas flow restrictions and turbulence

  • Leak-tight and corrosion-resistant, ideal for UHV environments

  • High-purity stainless steel for long-term performance

  • Custom sizes and configurations available to meet specific needs

Ordering Table

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

Accessories Table

Description For Per Package VacuCADSM Part Number Price In Stock Add Item
Cast Clamps (SS) KF10, KF16 Flanges 1 (please log in) QF16-075-CS P.O.R.
Cast Clamps (SS) KF25 Flanges 1 (please log in) QF25-100-CS P.O.R.
Cast Clamps (SS) KF40 Flanges 1 (please log in) QF40-150-CS P.O.R.
Cast Clamps (SS) KF50 Flanges 1 (please log in) QF50-200-CS P.O.R.
Cast Clamps (Aluminum) KF10, KF16 Flanges 1 (please log in) QF16-075-C P.O.R.
Cast Clamps (Aluminum) KF25 Flanges 1 (please log in) QF25-100-C P.O.R.
Cast Clamps (Aluminum) KF40 Flanges 1 (please log in) QF40-150-C P.O.R.
Cast Clamps (Aluminum) KF50 Flanges 1 (please log in) QF50-200-C P.O.R.
Lever Clamps (Aluminum) KF10, KF16 Flanges 1 N/A QF16-075-CHA P.O.R.
Lever Clamps (Aluminum) KF25 Flanges 1 N/A QF25-100-CHA P.O.R.
Lever Clamps (Aluminum) KF40 Flanges 1 N/A QF40-150-CHA P.O.R.
Centering Ring (SS with Fluorocarbon O-Ring) KF10 Flanges 1 (please log in) QF10-050-SRV P.O.R.
Centering Ring (SS with Fluorocarbon O-Ring) KF16 Flanges 1 (please log in) QF16-075-SRV P.O.R.
Centering Ring (SS with Fluorocarbon O-Ring) KF25 Flanges 1 (please log in) QF25-100-SRV P.O.R.
Centering Ring (SS with Fluorocarbon O-Ring) KF40 Flanges 1 (please log in) QF40-150-SRV P.O.R.
Centering Ring (SS with Fluorocarbon O-Ring) KF50 Flanges 1 (please log in) QF50-200-SRV P.O.R.
Description For Per Package VacuCADSM Part Number Price In Stock Add Item

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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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