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DN200CF (10.00″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

CF (ConFlat) Flanges: The Standard for High Vacuum Applications

The CF (ConFlat) flange is the industry standard for high vacuum (HV) and ultra-high vacuum (UHV) applications. This flange system supports a wide range of gauges, instruments, accessories, and feedthroughs, making it a versatile choice for various vacuum setups.

Blank (Blind) Flanges

A blank or blind flange is a solid disc-shaped fitting used in vacuum systems to seal off unused sections of tubing or ports on a vacuum chamber. These flanges can be customized through machining to meet specific requirements.

The sealing mechanism utilizes a knife-edge design, which is machined below the flange’s flat surface. When the bolts of a flange pair are tightened, the knife edges create annular grooves on each side of a soft metal gasket. The extruded metal fills in any machining marks and surface imperfections, resulting in a leak-tight seal. The CF seal effectively operates within a pressure range from 760 torr (103 mbar) to < 1 x 10⁻¹³ torr (< 1.3 x 10⁻¹³ mbar) and within a temperature range of -196° C to 450° C, depending on the materials used.

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

Available Versions of ConFlat Flanges

CF flanges are available in four main versions:

  1. Fixed Flange: This is a one-piece design where the bolt-hole orientation is fixed relative to the fitting.
  2. Rotatable Flange: Comprising an inner weld ring and an outer bolt ring, this design allows the bolt ring to rotate around the inner weld ring.

Both fixed and rotatable flanges can be customized with your choice of through (clearance) holes or tapped holes, ensuring compatibility with various vacuum system configurations.

Ordering Table

Flange Size/OD Type Flange Material Part Number
DN200CF (10.00" OD) Fixed 304L SS F1000X000N
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X000NM
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X000NT
DN200CF (10.00" OD) Rotatable 304L SS F1000X000R
DN200CF (10.00" OD) Rotatable Tapped 304L SS F1000X000RM
DN200CF (10.00" OD) Rotatable Tapped 304L SS F1000X000RT
DN200CF (10.00" OD) Fixed 304L SS F1000X800N
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X800NM
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X800NT
DN200CF (10.00" OD) Rotatable 304L SS F1000X800R
DN200CF (10.00" OD) Rotatable Tapped 304L SS F1000X800RM
DN200CF (10.00" OD) Rotatable Tapped 304L SS F1000X800RT
DN200CF (10.00" OD) Fixed Tapped 304L SS F1000X813NM
DN200CF (10.00" OD) Rotatable Tapped 304L SS F1000X813RM

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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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