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KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6)

KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6)

KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6): Lightweight Vacuum Adapters for Cross-Size KF Connections

The KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6) from TFM are designed to connect two different KF flange sizes within high vacuum systems while preserving flow alignment and minimizing turbulence. These reducer nipples feature a conical profile, making them ideal for applications where gradual internal transitions are preferred over abrupt diameter changes.

Constructed from aluminum 6061-T6, these conical reducers offer a lightweight, cost-effective alternative to stainless steel components—without sacrificing vacuum performance. The KF (QF) flange system is widely used for through-lines, pump ports, and chamber connections, and these adapters bring added flexibility to flange size configurations.

Key Features:

  • Conical Transition Geometry
    Unlike straight reducers, conical designs offer a tapered internal flow path, reducing back pressure and promoting smoother gas dynamics.

  • Dual KF Flange Sizes
    Each nipple terminates in two KF flanges of different sizes, such as KF40 to KF25, supporting integration between mismatched KF ports using standard vacuum clamps and centering rings.

  • Aluminum 6061-T6 Construction
    Offers excellent machinability, corrosion resistance, and significant weight reduction—ideal for portable systems or installations where component mass is a concern.

  • High Vacuum Compatible
    Suitable for systems operating down to ~10⁻⁶ to 10⁻⁷ torr, especially when paired with appropriate elastomer seals and clamps.

  • Flexible Sizing and Lengths
    Standard flange size combinations and tube lengths are available. Custom configurations of KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6) can also be fabricated to fit specific design requirements.

Applications:

  • Connecting KF flanges of differing sizes in foreline plumbing

  • Reducing chamber port sizes while maintaining vacuum compatibility

  • Streamlining vacuum manifold configurations with KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6)

  • Incorporating sensitive instruments into lines with minimal pressure disturbance

  • Lightweight vacuum assemblies in mobile systems or compact setups

TFM also offers related solutions, including straight reducer nipples, KF full and half nipples, and clamping accessories to support complete KF vacuum flange assemblies.

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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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