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KF (QF) HV Blank Flanges (Brass)

KF (QF) HV Blank Flanges (Brass)

KF (QF) HV Blank Flanges (Brass): Economical Sealing for General High-Vacuum Applications

KF (QF) HV Blank Flanges (Brass) are essential components used to cap or seal off unused KF ports in high-vacuum (HV) systems. These flanges are engineered for vacuum isolation in foreline plumbing, chamber ports, and instrumentation setups, providing a secure, leak-tight seal that ensures the stability and integrity of the vacuum system. Designed according to KF (QF) international standards, these blanks are interchangeable with all standard KF hardware.

Crafted from high-quality brass, KF (QF) HV Blank Flanges (Brass) offer a balance of performance, durability, and cost-effectiveness. While not as corrosion-resistant as stainless steel, brass is ideal for general-purpose vacuum applications where chemical exposure and extreme temperature conditions are not primary concerns. These blank flanges are commonly found in laboratory setups, vacuum coating systems, analytical instruments, and OEM equipment where unused ports must be reliably sealed.

Each KF (QF) HV Blank Flange (Brass) features a flat, non-bored sealing face with a chamfered back surface. When mated with another KF flange using a centering ring and elastomeric o-ring, and secured by a circumferential clamp (such as wing-nut, thumbscrew, or bolt-style), the flange creates a vacuum-tight seal rated for pressures down to 10⁻⁸ Torr. The seal integrity depends on the o-ring material, which also defines the operational temperature range—typically 0 °C to 120–180 °C.

One of the main advantages of KF (QF) HV Blank Flanges (Brass) is their modularity and reusability. Unlike welded or custom-sealed terminations, these blanks can be quickly installed, removed, or relocated as system needs evolve—making them particularly suitable for flexible research environments and systems in development or prototyping stages.

TFM supplies KF (QF) HV Blank Flanges (Brass) in all standard KF sizes including KF16, KF25, KF40, and KF50. These components are manufactured to tight tolerances for consistent, leak-free performance and full compatibility with other KF system components. For specific needs such as vent holes or customized flange geometry, custom machining options are available upon request.

In summary, KF (QF) HV Blank Flanges (Brass) provide a reliable, cost-efficient solution for sealing unused KF ports in general-purpose high-vacuum systems. Their simple installation, KF-standard compatibility, and dependable vacuum sealing performance make them an indispensable tool for vacuum engineers and technicians across research, industry, and OEM environments.

Ordering Table

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

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
Description For Per Package Part Number

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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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