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Flex Metal Bellows – Edge Welded with Tube Ends

We manufacture tube-end (tubulated) edge-welded bellows specifically designed for ultra-high vacuum (UHV) systems using 347 stainless steel hoses. Unlike hydraulically formed metal hoses, edge-welded bellows offer exceptional flexibility and naturally spring back to their original length—typically halfway between their fully extended and compressed positions—when not under vacuum pressure.

 Key Features of Edge-Welded Bellows

  • Highly flexible design
  • Automatically return to their natural length when not in vacuum
  • Maximum bakeout temperature of 250°C for stainless steel

Ordering Table

Drawing BellowsOD BellowsID Length(extended) Length(compressed) DimA DimB DimC Part Number
Tooltip 0.4 0.2 0.21 0.08 0.25 0.04 0.3 MEW0400201E
Tooltip 0.64 0.34 0.32 0.08 0.44 0.04 0.41 MEW0640341E
Tooltip 0.75 0.25 0.53 0.16 0.5 0.04 0.43 MEW0750251E
Tooltip 0.84 0.52 0.34 0.08 0.56 0.04 0.43 MEW0840521E
Tooltip 1.03 0.55 0.5 0.16 0.69 0.04 0.43 MEW1030551E
Tooltip 1.25 0.75 0.53 0.16 0.88 0.04 0.43 MEW1250751E
Tooltip 1.36 0.54 1.2 0.22 0.94 0.04 0.43 MEW1360541E
Tooltip 1.38 0.83 0.69 0.19 1 0.04 0.43 MEW1380831E
Tooltip 1.5 0.96 0.57 0.12 1.13 0.04 0.43 MEW1500961E
Tooltip 1.63 0.75 0.92 0.2 1 0.04 0.44 MEW1620751E
Tooltip 1.89 1.39 0.74 0.17 1.5 0.04 0.44 MEW1891391E
Tooltip 2 1.25 0.79 0.2 1.25 0.04 0.44 MEW2001251E
Tooltip 2.2 1.04 1.22 0.2 1.5 0.04 0.44 MEW2201041E
Tooltip 2.25 1.5 0.79 0.16 1.5 0.04 0.44 MEW2251501E
Tooltip 2.49 1.53 1.01 0.2 1.63 0.04 0.44 MEW2491531E
Tooltip 2.5 1.75 0.79 0.2 1.88 0.04 0.44 MEW2501751E
Tooltip 2.75 1.75 1.05 0.2 1.88 0.04 0.44 MEW2751751E
Tooltip 3 2 1.05 0.2 2.13 0.07 0.59 MEW3002001E
Tooltip 3.25 2.25 1.05 0.24 2.38 0.07 0.59 MEW3252251E
Tooltip 3.5 2 1.58 0.24 2.38 0.07 0.59 MEW3502001E
Tooltip 3.5 2.5 1.05 0.16 2.63 0.07 0.59 MEW3502501E
Tooltip 3.99 2.69 1.37 0.24 2.75 0.07 0.59 MEW3992691E
Tooltip 4.25 3.2 1.1 0.28 3.75 0.07 0.59 MEW4253201E
Tooltip 4.35 3.64 0.75 0.16 3.75 0.07 0.59 MEW4353641E
Tooltip 4.75 3.75 1.05 0.2 4 0.07 0.59 MEW4753751E
Tooltip 4.97 4 1.12 0.22 4.25 0.07 0.59 MEW4974001E

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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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