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CF to NPT Adapters

CF to NPT Adapters

CF to NPT Adapters: Secure Vacuum-to-Threaded System Integration for UHV and Fluid Applications

The CF to NPT Adapters from TFM offer a reliable and flexible solution for joining ConFlat (CF) vacuum flanges to standard National Pipe Thread (NPT) fittings. These adapters enable system designers to bridge ultra-high vacuum (UHV) environments with conventional process plumbing or instrumentation setups, streamlining integration across equipment platforms.

Constructed from 304 series stainless steel, each adapter is precision-machined to ensure both vacuum integrity and thread compatibility, making them suitable for high-purity gas handling, cryogenic systems, and vacuum diagnostic assemblies. The CF flange end provides a metal-to-metal, bakeable vacuum seal, while the NPT port accommodates a wide range of pipe-threaded accessories such as valves, gauges, or tubing connectors.

Key Features of CF to NPT Adapters:

  • Versatile System Interface
    Joins CF flanges (available in sizes like DN16CF, DN35CF, DN63CF) to female or male NPT threads for direct connection with standard pipe fittings.

  • Ultra-High Vacuum Compatible
    The CF flange end supports UHV conditions down to 10⁻⁹ torr, using a copper gasket compressed between knife-edge sealing surfaces.

  • Threaded Process Port
    NPT thread (typically 1/4″, 3/8″, or 1/2″) allows for robust, tapered sealing with compatible components, commonly found in gas delivery and pressure systems.

  • 304 Stainless Steel Construction
    Corrosion-resistant and thermally stable, suitable for high-temperature bakeouts and chemically aggressive environments.

  • Leak-Free Performance
    Both the CF flange and NPT interface are engineered to maintain integrity under vacuum or moderate pressure, ideal for hybrid process/vacuum applications.

Typical Applications:

  • Connecting pressure gauges, valves, or regulators to CF-sealed vacuum systems

  • Transitioning between vacuum components and fluid handling subsystems

  • Instrumentation lines where UHV chamber access is needed for purge or sampling

  • Clean gas injection into UHV environments via standard NPT flow components

  • Retrofitting legacy vacuum equipment with off-the-shelf fluid fittings

TFM also provides complementary components such as CF blank flanges, Swagelok to CF adapters, CF elbows and tees, and gasket and bolt kits to complete your vacuum plumbing architecture.

In summary, CF to NPT Adapters by TFM offer a high-performance connection method that bridges precision vacuum sealing with industry-standard threaded components. Their stainless steel design, UHV compatibility, and system flexibility make them essential in lab-scale research, industrial vacuum lines, and integrated fluid delivery networks.

Ordering Table

Flange Size/OD Fitting Part Number
DN16CF (1.33" OD) 1/8" NPT F0133XFNPT2
DN16CF (1.33" OD) 1/4" NPT F0133XFNPT4
DN35CF-DN40CF (2.75" OD) 1/8" NPT F0275XFNPT2
DN35CF-DN40CF (2.75" OD) 1/4" NPT F0275XFNPT4
DN35CF-DN40CF (2.75" OD) 1/8" NPT 1 x Radial DFF275X1NPT
DN35CF-DN40CF (2.75" OD) 1/8" NPT 2 x Radial DFF2752NPT18

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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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