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ConFlat® (CF) UHV Straight Reducer Nipples

ConFlat® (CF) UHV Straight Reducer Nipples

ConFlat® (CF) UHV Straight Reducer Nipples: Precision Flange Transitions for Ultra-High Vacuum Integrity

ConFlat® (CF) UHV Straight Reducer Nipples from TFM are purpose-built components designed to connect two different CF flange sizes in a straight, axial configuration within ultra-high vacuum (UHV) systems. Made from high-purity 304L stainless steel and terminated with knife-edge ConFlat flanges, these reducer nipples are ideal for high-integrity sealing across instrumentation ports, vacuum chambers, and diagnostic systems.

Unlike conical designs, CF UHV Straight Reducer Nipples maintain a linear path between connected flanges, making them ideal for systems that demand direct, compact transitions without altering flow direction.

Key Features of ConFlat® (CF) UHV Straight Reducer Nipples:

  • Straight Reducer Geometry
    Each nipple enables a direct connection between mismatched CF flange sizes—such as CF63 to CF40 or CF40 to CF16—while maintaining a straight internal passage for unimpeded flow.

  • CF Knife-Edge Flange Ends
    The reducer nipple is equipped with standard CF flanges on both ends, compatible with copper gaskets for reliable metal-to-metal sealing in high and ultra-high vacuum environments.

  • 304L Stainless Steel Construction
    Fabricated from low-carbon stainless steel, these ConFlat® (CF) UHV Straight Reducer Nipples provide excellent corrosion resistance, weldability, and stability during system bake-out cycles.

  • UHV Performance
    Suitable for systems operating at pressures down to 10⁻¹⁰ torr, the straight reducer design ensures no leak paths or alignment issues when assembled with proper hardware.

  • Versatile Sizing & Custom Fabrication
    Standard reducer sizes and lengths are readily available. TFM also offers custom manufacturing of ConFlat® (CF) UHV Straight Reducer Nipples to meet specific configuration or spatial requirements.

Applications:

  • Connecting CF flange components with different nominal sizes in vacuum chambers

  • Integrating sensors, gauges, or feedthroughs requiring smaller CF ports

  • Upgrading or retrofitting UHV systems with mixed flange standards

  • Simplifying axial transitions in beamline systems or UHV manifolds

  • Ensuring vacuum integrity in research instruments, analytical systems, and cleanroom tools

TFM supports a wide range of UHV flange accessories, including CF full nipples, conical reducers, rotatable flanges, and complete gasket and bolt kits, offering everything needed to build or modify a high-performance vacuum system with confidence.

Ordering Table

Flange Size/OD (Large) Flange Size/OD (Small) Part Number
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) RN0600X275
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) RN0800X275
DN63CF (4.50" OD) DN63CF (4.50" OD) RN0800X450
DN100CF (6.00" OD) DN100CF (6.00" OD) RN0800X600
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) RN1000X275
DN63CF (4.50" OD) DN63CF (4.50" OD) RN1000X450
DN100CF (6.00" OD) DN100CF (6.00" OD) RN1000X600
DN160CF (8.00" OD) DN160CF (8.00" OD) RN1000X800
DN200CF (10.00" OD) DN200CF (10.00" OD) RN1325X1000
DN160CF (8.00" OD) DN160CF (8.00" OD) RN1325X800
DN200CF (10.00" OD) DN200CF (10.00" OD) RN1200X1000

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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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