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KF (QF) HV Blank Stubs (Brass)

KF Flanges Overview

KF flanges, also known as KF (Klein Flansche) flanges, are standardized by the International Standards Organization. These fittings play a crucial role in various vacuum applications.

Key Features:

  • Applications: KF fittings are primarily used in through or foreline vacuum plumbing, making them suitable for simple high vacuum (HV) systems operating at pressures as low as 10⁻⁸ Torr.
  • Seal Mechanism: The elastomeric o-ring used in these connections helps define both the temperature range and ultimate vacuum achievable.
  • Material Options:
    • 304L Stainless Steel: These fittings are designed to withstand adverse temperatures and corrosive conditions, ensuring long-term reliability.
    • Aluminum and Brass: These materials are ideal for more general applications where extreme durability is not necessary.

KF flanges provide a dependable solution for maintaining vacuum integrity in a variety of industrial and research environments.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number
KF10 (1.18" OD) Stub, Blank 360 Brass Tooltip QF10-050-UB
KF16 (1.18" OD) Stub, Blank 360 Brass Tooltip QF16-075-UB
KF25 (1.57" OD) Stub, Blank 360 Brass Tooltip QF25-100-UB
KF40 (2.16" OD) Stub, Blank 360 Brass Tooltip QF40-150-UB
KF50 (2.95" OD) Stub, Blank 360 Brass Tooltip QF50-200-UB

Accessories Table

Description For Per Package Part Number
Cast Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-C
Cast Clamps (Aluminum) KF25 Flanges 1 QF25-100-C
Cast Clamps (Aluminum) KF40 Flanges 1 QF40-150-C
Cast Clamps (Aluminum) KF50 Flanges 1 QF50-200-C
Lever Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-CHA
Lever Clamps (Aluminum) KF25 Flanges 1 QF25-100-CHA
Lever Clamps (Aluminum) KF40 Flanges 1 QF40-150-CHA

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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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