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KF (QF) HV Centering Rings (Al)

KF (QF) HV Centering Rings (SS)

Introduction to KF (QF) HV Centering Rings (Stainless Steel)

In the realm of high and ultra-high vacuum (HV/UHV) systems, sealing integrity is everything. One small leak can compromise experiments, degrade performance, or damage equipment. That’s why KF (QF) hardware, and specifically KF (QF) HV Centering Rings made from stainless steel, play a critical role in modern vacuum setups. At TFM, we offer precision-engineered stainless steel centering rings designed for reliability, repeatability, and compatibility with ISO-KF flange systems.

What Are KF (QF) Centering Rings?

KF (QF) centering rings are circular components designed to sit between two vacuum flanges, positioning an elastomer O-ring for a proper seal. They are essential in clamping-style vacuum systems that rely on rapid assembly and disassembly without sacrificing performance.

While centering rings can be made from a range of materials including aluminum or plastic, stainless steel is preferred for environments where strength, thermal stability, and corrosion resistance are paramount.

Why Stainless Steel?

Stainless steel centering rings are ideal for high-performance applications. Their advantages include:

  • Corrosion Resistance: Perfect for reactive or humid environments

  • High-Temperature Tolerance: Maintains sealing strength in elevated temperatures

  • Mechanical Durability: Withstands repeated use and pressure cycling

  • Chemical Compatibility: Safe for use with aggressive cleaning agents and gases

TFM’s stainless steel centering rings are fabricated from high-grade materials and polished to ensure a smooth sealing surface, reducing the risk of leaks and outgassing.

Key Applications

These centering rings are a go-to choice for industries including:

  • Semiconductor Manufacturing

  • Laboratory Research (Physics & Chemistry)

  • Vacuum Coating and Deposition Systems

  • Mass Spectrometry

  • Pharmaceutical & Biotech Processing

In all of these fields, a secure vacuum seal is essential to controlling environments and preventing contamination.

Compatibility and Construction

TFM’s KF (QF) HV Centering Rings (SS) are fully compatible with ISO-KF flanges in sizes ranging from DN10 to DN50. They are typically paired with Viton®, NBR, or EPDM O-rings depending on the application’s temperature and chemical requirements.

Each centering ring is crafted to exacting standards to ensure perfect fitment, repeatable performance, and minimal particle shedding—critical in UHV environments.

Advantages of TFM’s Stainless Steel Centering Rings

  • ✔ Made from corrosion-resistant stainless steel

  • ✔ Engineered to ISO-KF standards for universal fit

  • ✔ Precision-manufactured for superior vacuum sealing

  • ✔ Reusable and robust for long-term operations

  • ✔ Suitable for both HV and UHV environments

Whether you’re assembling a new system or maintaining an existing vacuum line, TFM’s stainless steel centering rings deliver the reliability professionals count on.

Ordering Table

Drawing Flange OD Dim A Dim B O-Ring Material Part Number
Tooltip KF10 0.37 0.47 Fluorocarbon QF10-050-SRV
Tooltip KF16 0.64 0.67 Fluorocarbon QF16-075-SRV
Tooltip KF25 0.93 1.03 Fluorocarbon QF25-100-SRV
Tooltip KF40 1.51 1.61 Fluorocarbon QF40-150-SRV
Tooltip KF50 1.95 2.05 Fluorocarbon QF50-200-SRV
Tooltip KF10 0.37 0.47 Buna-N QF10-050-SRB
Tooltip KF16 0.64 0.67 Buna-N QF16-075-SRB
Tooltip KF25 0.93 1.03 Buna-N QF25-100-SRB
Tooltip KF40 1.51 1.61 Buna-N QF40-150-SRB
Tooltip KF50 1.95 2.05 Buna-N QF50-200-SRB

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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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