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KF (QF) HV Flange Caps

KF (QF) HV Flange Caps

Understanding KF (QF) HV Flange Caps: Reliable Sealing Solutions for High Vacuum Systems

In high vacuum environments, maintaining system integrity is crucial. Every component, no matter how small, plays a vital role in ensuring performance, cleanliness, and vacuum stability. One such essential yet often overlooked component is the KF (QF) HV Flange Cap.

What Are KF (QF) Flange Caps?

KF (QF) refers to a standardized quick-flange vacuum interface, part of the ISO-KF system widely used in high vacuum (HV) applications. KF flanges allow for quick, tool-free assembly and disassembly of vacuum components, making them ideal for both laboratory and industrial settings.

KF flange caps are specifically designed to seal off unused ports on KF flange systems. Whether you’re conducting maintenance, isolating parts of a vacuum system, or storing components, these caps help protect internal components from contamination and prevent loss of vacuum pressure.

Key Benefits and Features

At TFM, we manufacture and supply high-performance KF (QF) HV Flange Caps in a variety of sizes and materials to meet diverse industry needs. Here are the core features:

  • Wide Compatibility: Our KF caps are compatible with standard ISO-KF flange sizes, including KF10, KF16, KF25, KF40, and KF50.

  • Material Options: Choose between 304 or 316L stainless steel for maximum corrosion resistance and mechanical durability, or aluminum for a lightweight, cost-effective alternative.

  • High Vacuum Sealing: When paired with a proper centering ring and clamp, KF flange caps offer leak-tight performance, helping maintain vacuum levels during equipment downtime or port isolation.

  • Reusable and Durable: Designed to withstand repeated use in harsh environments, our caps are easy to clean and resistant to chemical and mechanical wear.

Applications in Vacuum Systems

KF flange caps are used across a broad range of high vacuum applications, including:

  • Semiconductor processing equipment

  • Research laboratories

  • Vacuum deposition systems

  • Analytical instrumentation

  • Pharmaceutical and aerospace vacuum chambers

In all these systems, KF caps serve as a quick, reliable solution for closing off vacuum lines without requiring extensive disassembly.

Why Choose TFM for KF Flange Caps?

TFM is a trusted provider of precision vacuum components. Our KF (QF) HV Flange Caps are manufactured under strict quality standards, ensuring dimensional accuracy, material consistency, and long-term performance in UHV and HV conditions.

Whether you’re building a new system or upgrading existing infrastructure, TFM’s vacuum hardware provides the reliability and flexibility your operations demand. Our KF caps come with full technical specifications and are available for global shipping.

Ordering Table

Flange OD Per Package Part Number
KF16 10 QF16CAP
KF25 10 QF25CAP
KF40 10 QF40CAP
KF50 10 QF50CAP

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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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