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ConFlat® (CF) UHV Conical Reducer Nipples

CF Nipples for Ultra-High Vacuum Systems

We manufacture CF nipples (spools) specifically designed for ultra-high vacuum (UHV) systems, using 304L stainless steel tubing and knife-edge (ConFlat) flanges. The CF flange is the standard choice for high vacuum and UHV applications, offering compatibility with a variety of gauges, instruments, accessories, and feedthroughs.

Features of CF Nipples

  • Half Nipples: These nipples come with one fixed flange, which can feature either tapped or through-hole bolt holes for secure fastening.
  • Full Nipples: Designed with one fixed flange and one rotatable flange, full nipples utilize through-hole bolt holes, providing flexibility in installation.
  • Reducer Nipples: Available in both conical and straight designs, these nipples are engineered to adapt to two different flange sizes, enhancing system versatility.
  • Custom Solutions: We offer common lengths and tube diameters; please reach out to us with your specific requirements for tailored options.

Ordering Table

Flange Size/OD (Large) Flange Size/OD (Small) Part Number
DN16CF (1.33" OD) DN16CF (1.33" OD) CRN212X133
DN16CF (1.33" OD) DN16CF (1.33" OD) CRN275X133
DN25CF (2.13" OD) DN25CF (2.13" OD) CRN275X212
DN25CF (2.13" OD) DN25CF (2.13" OD) CRN337X212
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) CRN337X275
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) CRN450X275
DN50CF (3.38" OD) DN50CF (3.38" OD) CRN450X337
DN35CF-DN40CF (2.75" OD) DN35CF-DN40CF (2.75" OD) CRN462X275
DN50CF (3.38" OD) DN50CF (3.38" OD) CRN462X337
DN63CF (4.50" OD) DN63CF (4.50" OD) CRN462X450
DN50CF (3.38" OD) DN50CF (3.38" OD) CRN600X337
DN63CF (4.50" OD) DN63CF (4.50" OD) CRN600X450

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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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