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China CF Knife-Edge Flange Gas Sealed Connectors Suppliers - Precision Vacuum Solutions from Factory
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China CF Knife-Edge Flange Gas Sealed Connectors Suppliers - Precision Vacuum Solutions from Factory

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The Knife-Edge Flange (CF) Receptacle is a meticulously crafted component ideal for establishing secure, demountable seals crucial for high-vacuum (HV) and ultra-high-vacuum (UHV) applications. As a leading supplier from China, our products are manufactured in strict compliance with the international standard ISO 3669**, ensuring compatibility and interchangeability in global scientific and industrial vacuum systems. Offered in a diverse range of nominal diameters from 10mm to 50mm, these flanges deliver versatile sealing solutions for building and connecting vacuum chambers, pipelines, and equipment, accommodating everything from compact research instruments to extensive industrial systems. Trust our factory for top-quality Knife-Edge Flanges that meet your high-vacuum needs.

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    Product Details

    Features and Advantages

    • 1

      The defining feature is the knife-edge sealing mechanism, where a sharp, precision-machined edge on the flange bites into a soft, ductile metal gasket (typically copper or aluminum) to form an extremely reliable, helium-leak-tight metal seal.

    • 2

      This design offers the critical advantages of superior sealing performance, the ability to withstand bake-out temperatures exceeding 150°C for UHV applications, and excellent reusability over many cycles.

    • 3

      The receptacle housing is crafted from high-grade stainless steel, typically 304 or 316L, providing excellent corrosion resistance, mechanical strength, and compatibility with the shell sealing requirements of connected components.

    • 4

      The system's versatility is enhanced by support for various plug configurations, including single-ended plugs, double-ended plugs, and double-ended wiring forms. A significant additional advantage is the capacity for customization of both standard and non-standard vacuum flange structures and dimensions to meet unique application requirements.

    Application

    These CF flanges are fundamental components in any application requiring reliable high or ultra-high vacuum. Key sectors include:

    Scientific Research

    Particle accelerators, synchrotrons, surface science analysis chambers (e.g., XPS, AES), and fusion research devices.

    Semiconductor Manufacturing

    Critical for plasma etching, chemical vapor deposition (CVD), and molecular beam epitaxy (MBE) systems.

    Space Simulation

    Used to construct thermal vacuum chambers for testing satellites and spacecraft components.

    Advanced Analytical Instrumentation

    Mass spectrometers, electron microscopes, and other high-vacuum analytical tools.

    Frequently Asked Questions

    Q1 What is the knife-edge sealing mechanism and how does it work?
    The knife-edge sealing mechanism uses a sharp, precision-machined edge on the CF flange to bite into a soft, ductile metal gasket — typically made of copper or aluminum. As the flange is tightened, the knife edge deforms and embeds into the gasket material, creating an exceptionally tight, helium-leak-proof metal seal suitable for ultra-high vacuum (UHV) environments.
    Q2 What materials are the gaskets typically made of, and can they be reused?
    Gaskets are typically made from soft, ductile metals such as copper or aluminum. Because the knife edge permanently deforms the gasket during sealing, gaskets are generally single-use and should be replaced each time the flange is reopened. However, the CF flanges themselves are highly reusable over many cycles without degradation in sealing performance.
    Q3 What stainless steel grades are used for the receptacle housing, and why?
    The receptacle housing is typically manufactured from 304 or 316L stainless steel. These grades are chosen for their excellent corrosion resistance, high mechanical strength, and low outgassing properties — all critical for maintaining vacuum integrity and compatibility with the shell sealing requirements of connected components in demanding environments.
    Q4 Can these CF flange connectors be customized for non-standard applications?
    Yes. A key advantage of these connectors is the capacity for customization of both standard and non-standard vacuum flange structures and dimensions. This allows engineers and researchers to specify unique configurations — including custom flange sizes, plug types (single-ended, double-ended), and wiring forms — to meet the precise requirements of specialized or proprietary systems.
    Q5 What bake-out temperature can these CF flanges withstand?
    These CF flanges are designed to withstand bake-out temperatures exceeding 150°C, which is a standard requirement for UHV (ultra-high vacuum) applications. Baking the vacuum system at elevated temperatures helps drive off adsorbed gases from the chamber walls, enabling the system to reach and maintain pressures in the ultra-high vacuum range.
    Q6 In which industries are CF flange vacuum connectors most commonly used?
    CF flange vacuum connectors are widely used across multiple high-technology sectors. These include scientific research (particle accelerators, synchrotrons, fusion devices), semiconductor manufacturing (CVD, MBE, plasma etching), space simulation (thermal vacuum testing of satellites), and advanced analytical instrumentation such as mass spectrometers and electron microscopes — wherever reliable high or ultra-high vacuum performance is essential.

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