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DN275CF (13.25″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

Overview of ConFlat Flanges

The ConFlat flange is the leading choice for high vacuum (HV) and ultra-high vacuum (UHV) applications. This flange system supports a wide range of gauges, instruments, accessories, and feedthroughs.

Blank (Blind) Flange

A blank or blind flange serves as a solid disc-shaped fitting within vacuum systems. It can be customized through machining to close off unused tubing or ports on a vacuum chamber.

Sealing Mechanism

The sealing mechanism utilizes a knife-edge that is precisely 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 extruded metal fills any machining marks and surface imperfections in the flange, resulting in a leak-tight seal. The ConFlat seal operates effectively within a pressure range from 760 torr (103 mbar) down to less than 1 x 10⁻¹³ torr (less than 1.3 x 10⁻¹³ mbar) and a temperature range of -196° C to 450° C, depending on the material used.

Flange Sizing

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

Available Versions of ConFlat Flanges

ConFlat flanges come in four distinct configurations:

  • Fixed Flange: This is a one-piece design where the bolt-hole orientation is fixed relative to the fitting.
  • Rotatable Flange: Comprising two parts—a weld ring and a bolt ring—this flange allows for the bolt ring to rotate around the inner weld ring.

Both fixed and rotatable flanges can be customized with either through (clearance) holes or tapped holes, catering to various application needs.

Ordering Table

Flange Size/OD Type Note Part Number
DN275CF (13.25" OD) Fixed — F1325X000N
DN275CF (13.25" OD) Fixed Tapped F1325X000NM
DN275CF (13.25" OD) Fixed Tapped — F1325X000NT
DN275CF (13.25" OD) Rotatable — F1325X000R
DN275CF (13.25" OD) Rotatable Tapped — F1325X000RT
DN275CF (13.25" OD) Fixed — F1325X1000N
DN275CF (13.25" OD) Fixed Tapped — F1325X1000NM
DN275CF (13.25" OD) Fixed Tapped — F1325X1000NT
DN275CF (13.25" OD) Rotatable — F1325X1000R
DN275CF (13.25" OD) Rotatable Tapped — F1325X1000RT
DN275CF (13.25" OD) Fixed — F1325X1075N
DN275CF (13.25" OD) Fixed Tapped — F1325X1075NT
DN275CF (13.25" OD) Rotatable F1325X1075R
DN275CF (13.25" OD) Rotatable Tapped — F1325X1075RT

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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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