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

KF Flanged Formed Bellows for HV Systems

TFM manufactures KF flanged formed bellows designed for high vacuum (HV) systems, using 300 series stainless steel flexible hoses paired with 304L stainless steel KF (QF) flanges. The KF (QF) flange is ideal for use in through-line or foreline vacuum plumbing, as well as simple ports in HV chambers, offering a reliable solution for vacuum sealing and connections.

MH-Series Bellows

  • Material: Manufactured from thin 300 series stainless steel, these bellows are designed to endure multiple flexing cycles without compromising their durability or flexibility.

Features of KF (QF) Flanged Flexible Hoses:

  • Unbraided Flexible Hoses: Capable of extending up to 10% beyond their operational length and compressing up to 15%, providing versatility in various vacuum applications.
  • Braided Flexible Hoses: Protected by a braided sheath, these hoses are designed to safeguard the convoluted structure from wear and damage, making them more robust for harsher environments.
  • Short Flexible Hoses: Perfect for addressing minor misalignments in components, ensuring proper connections in tight spaces.
  • Longer Flexible Hoses: Typically used as roughing lines, these hoses offer flexibility for applications requiring more extensive connections.

TFM’s KF flanged bellows provide a versatile, durable solution for HV systems, designed to meet the needs of both small-scale adjustments and larger vacuum applications.

Ordering Table

Drawing FlangeSize Length WallThickness BellowsID Part Number
Tooltip 16 3 0.006 0.75 MHT-QF-A03
Tooltip 16 6 0.006 0.75 MHT-QF-A06
Tooltip 16 10 0.006 0.75 MHT-QF-A10
Tooltip 16 12 0.006 0.75 MHT-QF-A12
Tooltip 16 18 0.006 0.75 MHT-QF-A18
Tooltip 16 20 0.006 0.75 MHT-QF-A20
Tooltip 16 24 0.006 0.75 MHT-QF-A24
Tooltip 16 30 0.006 0.75 MHT-QF-A30
Tooltip 16 36 0.006 0.75 MHT-QF-A36
Tooltip 25 3 0.006 1 MHT-QF-B03
Tooltip 25 6 0.006 1 MHT-QF-B06
Tooltip 25 10 0.006 1 MHT-QF-B10
Tooltip 25 12 0.006 1 MHT-QF-B12
Tooltip 25 18 0.006 1 MHT-QF-B18
Tooltip 25 20 0.006 1 MHT-QF-B20
Tooltip 25 24 0.006 1 MHT-QF-B24
Tooltip 25 30 0.006 1 MHT-QF-B30
Tooltip 25 36 0.006 1 MHT-QF-B36
Tooltip 25 40 0.006 1 MHT-QF-B40
Tooltip 25 48 0.006 1 MHT-QF-B48
Tooltip 40 3 0.006 1.5 MHT-QF-C03
Tooltip 40 6 0.006 1.5 MHT-QF-C06
Tooltip 40 10 0.006 1.5 MHT-QF-C10
Tooltip 40 12 0.006 1.5 MHT-QF-C12
Tooltip 40 18 0.006 1.5 MHT-QF-C18
Tooltip 40 20 0.006 1.5 MHT-QF-C20
Tooltip 40 24 0.006 1.5 MHT-QF-C24
Tooltip 40 30 0.006 1.5 MHT-QF-C30
Tooltip 40 36 0.006 1.5 MHT-QF-C36
Tooltip 40 40 0.006 1.5 MHT-QF-C40
Tooltip 40 48 0.006 1.5 MHT-QF-C48
Tooltip 50 4 0.006 2 MHT-QF-D04
Tooltip 50 6 0.006 2 MHT-QF-D06
Tooltip 50 10 0.006 2 MHT-QF-D10
Tooltip 50 12 0.006 2 MHT-QF-D12
Tooltip 50 18 0.006 2 MHT-QF-D18
Tooltip 50 20 0.006 2 MHT-QF-D20
Tooltip 50 24 0.006 2 MHT-QF-D24
Tooltip 50 30 0.006 2 MHT-QF-D30
Tooltip 50 36 0.006 2 MHT-QF-D36
Tooltip 50 40 0.006 2 MHT-QF-D40
Tooltip 50 48 0.006 2 MHT-QF-D48

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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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