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Flex Metal Bellows – Edge Welded with CF Flanges

CF Flanged Edge-Welded Bellows for UHV Systems

We produce CF flanged edge-welded bellows for ultra-high vacuum (UHV) systems using durable 347 stainless steel hoses paired with 304L stainless steel knife-edge (ConFlat) flanges. Unlike hydraulically formed metal hoses, edge-welded bellows offer superior flexibility and naturally return to their original length—typically halfway between their extended and compressed states—when not subjected to vacuum conditions. The CF flange is the industry standard for high vacuum and UHV applications, providing compatibility with various gauges, instruments, accessories, and feedthroughs.

Key Features of Edge-Welded Bellows

  • Exceptional flexibility
  • Automatic spring-back to natural length when vacuum is not applied
  • Maximum bakeout temperature of 250°C for stainless steel

Ordering Table

Drawing FlangeSize BellowsOD BellowsID Length(extended) Length(compressed) Part Number
Tooltip 1-1/3" 0.75 0.25 1.37 1 MEW0750251C1
Tooltip 1-1/3" 1.03 0.55 1.34 1 MEW1030551C2
Tooltip 1-1/3" 1.03 0.55 1.84 1.5 MEW1030551C3
Tooltip 2-3/4" 1.5 0.96 1.85 1.4 MEW1500961C1
Tooltip 2-3/4" 1.89 1.39 2.02 1.45 MEW1891391C2
Tooltip 2-3/4" 1.89 1.39 2.62 2.05 MEW1891391C3
Tooltip 3-3/8" 2 1.25 2.47 1.84 MEW2001251C1
Tooltip 2-3/4" 2.25 1.5 2.07 1.44 MEW2251501C2
Tooltip 2-3/4" 2.25 1.5 2.67 2.04 MEW2251501C3
Tooltip 4-1/2" 2.75 1.75 2.89 2.04 MEW2751751C1
Tooltip 3-3/8" 3 2 2.75 1.9 MEW3002001C2
Tooltip 3-3/8" 3 2 3.35 2.5 MEW3002001C3
Tooltip 4-1/2" 3.5 2.5 2.89 2 MEW3502501C2
Tooltip 4-1/2" 3.5 2.5 3.49 2.6 MEW3502501C3
Tooltip 6" 4.97 4 3.94 3.04 MEW4974001C3
Tooltip 8" 7.5 6 4.6 3.26 MEW7506001C3
Tooltip 10" 9.8 8.8 4.13 3.32 MEW9508501C3

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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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