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Weldable Tube 4-Way Crosses

Weldable Cross Tube Fittings from TFM

At TFM, we produce high-quality weldable cross tube fittings crafted from 304 series stainless steel. These fittings are particularly suited for use in semiconductor process equipment, serving as roughing lines as well as foreline and pump exhaust lines within semiconductor subfabs.

Features of Our Weldable Crosses

  • Optimal Cleanliness for UHV Applications: Our fittings achieve cleanliness levels suitable for ultra-high vacuum (UHV) applications down to > 10<sup>-13</sup> Torr.
  • Advanced Fabrication Techniques: Manufactured using the pulled-port technique, our fittings feature full penetration butt welds, ensuring structural integrity and performance.
  • Crevice-Free Weld Joints: Designed to minimize potential contamination, our weld joints are crevice-free, enhancing reliability in critical applications.
  • Wide Temperature Range: Our fittings can withstand temperatures ranging from -200 °C to 450 °C, making them versatile for various environments.
  • Reducer Crosses Available: We offer reducer crosses that accommodate two different tube sizes, providing flexibility in your setup.
  • Custom Options: While we list common wall thicknesses and tube diameters, please reach out to us for specific requirements or to inquire about flanged versions.

Specifications

  • Vacuum Range: ≥ 1×10<sup>-13</sup> Torr
  • Temperature Range: -200° to 450° C

For more information or to discuss your specific needs, don’t hesitate to contact TFM.

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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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