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Fixed Blank (Blind) 304L SS Standard ConFlat® (CF) UHV Flanges

Overview of ConFlat Flanges

The CF (ConFlat) flange is the most prevalent choice for high vacuum (HV) and ultra-high vacuum (UHV) applications, serving as the foundation for a variety of gauges, instruments, accessories, and feedthroughs.

Blank (Blind) Flanges

A blank or blind flange is essentially a solid, disc-shaped fitting designed for vacuum systems. It can be machined to create customized fittings or to seal off unused tubing sections and ports on vacuum chambers.

Seal Mechanism

The sealing mechanism of the CF flange involves a knife-edge that is machined beneath the flange’s flat surface. When the bolts of a flange pair are tightened, these knife-edges create annular grooves on either side of a soft metal gasket. This design allows the extruded metal to fill in any machining marks and surface defects, ensuring a leak-tight seal. The CF seal operates effectively at pressures ranging from 760 torr (103 mbar) down to less than 1 x 10^-13 Torr (approximately 1.3 x 10^-13 mbar) and within a temperature range of -196°C to 450°C, depending on the material used.

Flange sizes in North America are typically identified by their outside diameter (O.D.), while 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 more commonly referenced.

Types of ConFlat Flanges

ConFlat flanges are available in four configurations:

  1. Fixed Flange: This one-piece design has a fixed bolt-hole orientation relative to the fitting.
  2. Rotatable Flange: Composed of two parts—a stationary inner weld ring and a rotating outer bolt ring—this design allows the bolt ring to turn around the inner weld ring.

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

Ordering Table

Flange Size/OD Type Part Number
DN16CF (1.33" OD) Fixed F0133X000N
DN16CF (1.33" OD) Fixed Weldneck F0133X000NW
DN25CF (2.13" OD) Fixed F0212X000N
DN35CF-DN40CF (2.75" OD) Fixed F0275X000N
DN50CF (3.38" OD) Fixed F0337X000N
DN63CF (4.50" OD) Fixed F0450X000N
DN75CF (4.63" OD) Fixed F0462X000N
DN100CF (6.00" OD) Fixed F0600X000N
DN125CF (6.75" OD) Fixed F0675X000N
DN160CF (8.00" OD) Fixed F0800X000N
DN200CF (10.00" OD) Fixed F1000X000N
DN250CF (12.00" OD) Fixed F1200X000N
DN275CF (13.25" OD) Fixed F1325X000N
DN295CF (14.00" OD) Fixed F1400X000N
DN350CF (16.50" OD) Fixed F1650X000N

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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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