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KF to Swagelok® Adapter

KF to Swagelok VCR® Adapter

KF to Swagelok VCR® Adapter: Precision Vacuum-to-Process Connections with Leak-Tight Integrity

The KF to Swagelok VCR® Adapter, engineered by TFM, provides a seamless and reliable interface between KF (QF) vacuum flanges and Swagelok VCR® face-seal fittings. This precision-machined component bridges the gap between vacuum plumbing and high-purity process systems, making it ideal for integration in semiconductor fabrication, pharmaceutical production, and ultra-high vacuum (UHV) research environments.

Constructed from high-grade 304 stainless steel, this adapter is designed for leak-free service across a wide range of pressures and environments. The KF flange termination allows quick, clamp-based assembly into vacuum lines, while the VCR® fitting end ensures a metal-to-metal, torque-free seal that withstands aggressive media, high purity demands, and repeated thermal cycling.

Key Features of the KF to Swagelok VCR® Adapter:

  • Cross-System Connectivity
    Provides a direct and secure transition from KF vacuum flanges to VCR® face-seal fittings, eliminating the need for intermediate adapters or custom assemblies.

  • Torque-Free VCR® Sealing
    The Swagelok VCR® end employs a metal gasket compressed between two flat-faced components, forming a permanent, leak-tight seal without rotational stress—ideal for critical gas delivery systems and UHV conditions.

  • KF Flange Interface
    Available in standard KF sizes (e.g., KF16, KF25, KF40), using clamp-and-centering ring assemblies for quick installation and maintenance.

  • 304 Stainless Steel Construction
    Machined from corrosion-resistant stainless steel for strength, durability, and compatibility with cleanroom or vacuum-grade processes.

  • Vacuum and Pressure Ratings
    Compatible with high-vacuum systems down to ~10⁻⁷ to 10⁻⁹ torr on the KF side, and process pressures up to 3000 psig on the VCR® side (depending on fitting size and configuration).

Typical Applications:

  • Connecting vacuum systems to high-purity gas delivery lines

  • Sample introduction or pump-down lines in analytical instruments

  • Clean-in-place (CIP) compatible setups in biopharma systems

  • UHV environments requiring removable, clean-seal fittings

  • Semiconductor processing tools where KF flanges meet face-seal standards

TFM also offers CF to VCR® adapters, KF to Swagelok tube fittings, and a full selection of vacuum-compatible seals, clamps, and gaskets to support every stage of system integration.

In summary, the KF to Swagelok VCR® Adapter provides a robust, vacuum-compatible solution for joining KF flange systems with the precision and cleanliness of Swagelok VCR® technology. Whether for research-grade vacuum labs or high-throughput process tools, this adapter ensures sealing reliability where it matters most.

Ordering Table

KF to Swagelok VCR® Adapter

Flange Size/OD Type Drawing Fitting Part Number
KF16 (1.18" OD) Female Tooltip 1/8" VCR QF16X2FVCR
KF16 (1.18" OD) Male Tooltip 1/8" VCR QF16X2MVCR
KF16 (1.18" OD) Female Tooltip 1/4" VCR QF16X4FVCR
KF16 (1.18" OD) Male Tooltip 1/4" VCR QF16X4MVCR
KF16 (1.18" OD) Female Tooltip 3/8" VCR QF16X6FVCR
KF16 (1.18" OD) Male Tooltip 3/8" VCR QF16X6MVCR
KF16 (1.18" OD) Female Tooltip 1/2" VCR QF16X8FVCR
KF16 (1.18" OD) Male Tooltip 1/2" VCR QF16X8MVCR
KF25 (1.57" OD) Female Tooltip 1/8" VCR QF25X2FVCR
KF25 (1.57" OD) Male Tooltip 1/8" VCR QF25X2MVCR
KF25 (1.57" OD) Female Tooltip 1/4" VCR QF25X4FVCR
KF25 (1.57" OD) Male Tooltip 1/4" VCR QF25X4MVCR
KF25 (1.57" OD) Female Tooltip 3/8" VCR QF25X6FVCR
KF25 (1.57" OD) Male Tooltip 3/8" VCR QF25X6MVCR
KF25 (1.57" OD) Female Tooltip 1/2" VCR QF25X8FVCR
KF25 (1.57" OD) Male Tooltip 1/2" VCR QF25X8MVCR
KF40 (2.16" OD) Female Tooltip 1/8" VCR QF40X2FVCR
KF40 (2.16" OD) Male Tooltip 1/8" VCR QF40X2MVCR
KF40 (2.16" OD) Female Tooltip 1/4" VCR QF40X4FVCR
KF40 (2.16" OD) Male Tooltip 1/4" VCR QF40X4MVCR
KF40 (2.16" OD) Female Tooltip 3/8" VCR QF40X6FVCR
KF40 (2.16" OD) Male Tooltip 3/8" VCR QF40X6MVCR
KF40 (2.16" OD) Female Tooltip 1/2" VCR QF40X8FVCR
KF40 (2.16" OD) Male Tooltip 1/2" VCR QF40X8MVCR

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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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