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Rotatable Tapped-Blank (Blind) 304L SS Standard ConFlat® (CF) UHV Flanges

Overview of ConFlat Flanges

The CF (ConFlat) flange stands as the preferred choice for high vacuum (HV) and ultra-high vacuum (UHV) applications. This versatile flange system accommodates various gauges, instruments, accessories, and feedthroughs, making it integral to numerous vacuum setups.

Blank (Blind) Flange

A blank or blind flange serves as a solid plate or disc-shaped fitting within vacuum systems. It can be custom-machined to either create specialized fittings or to seal off unused sections of tubing or ports on vacuum chambers, ensuring effective containment and operational integrity.

Seal Mechanism

The CF flange employs a unique seal mechanism featuring a knife-edge that is machined below the flange’s flat surface. When the bolts of a flange pair are tightened, these knife-edges form annular grooves on either side of a soft metal gasket. The extruded metal from the gasket fills any machining marks and surface defects, resulting in a robust leak-tight seal. This CF seal operates effectively within a pressure range of 760 torr (103 mbar) 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 materials utilized.

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

Types of ConFlat Flanges

ConFlat flanges are available in four primary versions:

  1. Fixed Flange: This is a one-piece design where the bolt-hole orientation is permanently fixed concerning the fitting, ensuring consistent alignment during installation.
  2. Rotatable Flange: Comprising an inner weld ring and an outer bolt ring, this configuration allows for the bolt ring to rotate around the inner weld ring, offering flexibility for precise alignment.

Both fixed and rotatable flanges can be customized with either through (clearance) holes or tapped holes, providing further adaptability to meet specific application requirements.

Ordering Table

Rotatable Tapped-Blank (Blind) 304L SS Standard ConFlat® (CF) UHV Flanges

Flange Size/OD Note Part Number
DN16CF (1.33" OD) — F0133X000RM
DN16CF (1.33" OD) — F0133X000RT
DN16CF (1.33" OD) — F0133X000RTW
DN25CF (2.13" OD) — F0212X000RT
DN35CF-DN40CF (2.75" OD) — F0275X000RM
DN35CF-DN40CF (2.75" OD) — F0275X000RT
DN50CF (3.38" OD) — F0337X000RT
DN63CF (4.50" OD) — F0450X000RM
DN63CF (4.50" OD) F0450X000RT
DN75CF (4.63" OD) — F0462X000RT
DN100CF (6.00" OD) — F0600X000RM
DN100CF (6.00" OD) — F0600X000RT
DN125CF (6.75" OD) — F0675X000RT
DN160CF (8.00" OD) — F0800X000RM
DN160CF (8.00" OD) — F0800X000RT
DN200CF (10.00" OD) — F1000X000RM
DN200CF (10.00" OD) — F1000X000RT
DN250CF (12.00" OD) — F1200X000RM
DN250CF (12.00" OD) — F1200X000RT
DN275CF (13.25" OD) — F1325X000RT
DN295CF (14.00" OD) — F1400X000RT
DN350CF (16.50" OD) — F1650X000RT

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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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