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Aluminum A2219 Standard ConFlat® (CF) UHV Flanges

The CF (ConFlat) flange is the most commonly utilized flange for high vacuum and ultra-high vacuum (UHV) applications, with a wide range of gauges, instruments, accessories, and feedthroughs compatible with this system.

Blank (Blind) Flange

A blank (blind) flange is a solid disc or plate used in vacuum systems to close off unused sections of tubing or ports on a vacuum chamber. It can be customized through machining to create specific fittings.

Seal Mechanism

The seal mechanism features a knife-edge machined below the flange’s flat surface. When the bolts of a flange pair are tightened, the knife edges create annular grooves on either side of a soft metal gasket. This process extrudes the metal, filling any machining marks and surface defects, resulting in a leak-tight seal. The CF seal operates effectively from 760 torr (103 mbar) to less than 1 x 10⁻¹³ Torr (less than 1.3 x 10⁻¹³ mbar) and can withstand temperatures ranging from -196°C to 450°C, depending on the material.

In North America, flange sizes are typically referenced by their outside diameter (O.D.), whereas in Europe and much of Asia, the nominal internal diameter (I.D.) of the largest tube that can be welded to a bored flange is usually cited.

Aluminum Features

  • Lightweight and Non-Magnetic: Ideal for applications sensitive to magnetic materials.
  • Good Thermal Conductivity: Facilitates efficient heat transfer.
  • Lower Residual Radioactivity: Compared to flanges made from ferrous materials.
  • Low Outgassing Rates: General properties of aluminum and surface preparation contribute to reduced outgassing.
  • Knife-Edges: Coated with CrN for enhanced hardness; maximum temperature for the CrN coating on the knife edges is 150°C.
  • Gaskets: Aluminum flanges require the use of aluminum gaskets for optimal performance.

Ordering Table

Flange Size/OD Type Flange Material Part Number
Fixed A2219 Aluminum A2219 Aluminum F0133A000N
Weldneck A2219 Aluminum A2219 Aluminum F0133A055W
Fixed A2219 Aluminum A2219 Aluminum F0275A000N
Weldneck A2219 Aluminum A2219 Aluminum F0275A150W
Fixed A2219 Aluminum A2219 Aluminum F0450A000N
Weldneck A2219 Aluminum A2219 Aluminum F0450A250W
Fixed A2219 Aluminum A2219 Aluminum F0600A000N
Weldneck A2219 Aluminum A2219 Aluminum F0600A400W
Fixed A2219 Aluminum A2219 Aluminum F0800A000N
Weldneck A2219 Aluminum A2219 Aluminum F0800A600W
Fixed A2219 Aluminum A2219 Aluminum F1000A000N
Weldneck A2219 Aluminum A2219 Aluminum F1000A800W

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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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