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Hydraulically (Hydro) Formed Bellows – KF (QF) Flanged (Standard Unbraided Wall)

Hydraulically (Hydro) Formed Bellows – KF (QF) Flanged (Standard Unbraided Wall)

Introduction

Hydraulically formed bellows with KF (also known as QF or NW) flanges are precision-engineered vacuum components designed to absorb mechanical movement, reduce vibration, and maintain reliable vacuum integrity. The hydroforming process creates seamless, corrugated bellows with uniform wall thickness, providing superior flexibility and durability compared to mechanically welded alternatives. These bellows are widely used in vacuum systems, semiconductor equipment, and research facilities where precise alignment and mechanical isolation are critical.

Detailed Description

Hydraulically formed bellows are produced from high-quality stainless steel tubing that is expanded under controlled hydraulic pressure into a die, forming consistent convolutions without weld seams. This results in a smooth internal surface, minimal particle generation, and longer service life.

Key features include:

  • Standard KF/QF Flanges – compatible with quick-clamp vacuum connections for fast, tool-free assembly.

  • Unbraided Wall Design – allows maximum axial, lateral, and angular flexibility.

  • Leak-Tight Construction – helium leak-tested to ensure ultra-high vacuum (UHV) compatibility.

  • Durable Stainless Steel (304/316L) – resists corrosion and provides excellent mechanical strength.

  • Clean, Particle-Free Fabrication – ideal for sensitive vacuum processes.

Applications

Hydraulically formed KF (QF) bellows are commonly used in:

  • Vacuum Systems – flexible connections for pumps, gauges, and fittings.

  • Semiconductor Manufacturing – vibration isolation and alignment adjustments.

  • Research Laboratories – high-vacuum and UHV experimental setups.

  • Optics & Laser Systems – minimizing vibration transfer in precision instruments.

  • General Industry – vacuum coating, analytical instruments, and process equipment.

Technical Parameters

ParameterTypical Value / RangeImportance
Flange StandardKF16 – KF50 (QF/NW)Covers common quick-clamp sizes
MaterialStainless Steel 304 / 316LCorrosion resistance, durability
Length100 – 1000 mm (customizable)Matches system design needs
Wall Thickness0.15 – 0.25 mmBalances flexibility and strength
Leak Rate≤ 1×10⁻⁹ mbar·L/sEnsures vacuum reliability
Temperature Range-196 °C to +450 °CSuitable for cryogenic and high-temp use

Comparison with Related Products

Type of BellowsKey AdvantageTypical Use
Hydroformed (Unbraided) KFMaximum flexibility, seamlessGeneral vacuum applications
Braided KF BellowsHigher pressure resistanceSystems with pressure surges
Mechanically Welded BellowsLower cost, less flexibleBasic vacuum piping

FAQ

QuestionAnswer
What is the difference between hydroformed and welded bellows?Hydroformed bellows are seamless, cleaner, and longer-lasting, while welded bellows are lower-cost but less flexible.
Can these bellows handle ultra-high vacuum (UHV)?Yes, they are helium leak-tested and suitable for high and ultra-high vacuum systems.
Are custom lengths and flange sizes available?Yes, we provide tailored dimensions upon request.
Do they require external support?For high-pressure or long lengths, external support or braiding may be recommended.
How are they packaged?Each bellow is capped, cleaned, and individually packed to maintain cleanliness during storage and shipping.

Packaging

All Hydroformed KF (QF) Bellows are cleaned for vacuum service, end-capped to prevent contamination, and sealed in protective packaging. They are shipped in sturdy cartons with labeling for quick identification and safe transport.

Conclusion

Hydraulically (Hydro) Formed Bellows with KF (QF) flanges provide unmatched flexibility, durability, and leak-tight performance for vacuum systems. Their seamless design ensures long-term reliability in semiconductor, laboratory, and industrial environments.

For detailed specifications and a quotation, please contact us at [sales@thinfilmmaterials.com].

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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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