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KF (QF) HV Straight Reducer Nipples (304L SS)

KF (QF) HV Straight Reducer Nipples (304L SS)

KF (QF) HV Straight Reducer Nipples (304L SS): Reliable Transitions for High Vacuum Line Configurations

TFM offers KF (QF) HV Straight Reducer Nipples (304L SS) designed to connect two different KF flange sizes while maintaining a straight, axial alignment. These components are ideal for simplifying high vacuum (HV) plumbing when integrating mixed flange dimensions into a single system. Crafted from corrosion-resistant 304L stainless steel, each reducer ensures long-term durability and vacuum integrity.

The straight geometry of this reducer design provides a smooth, in-line path for gases or vapors, helping maintain consistent flow across forelines, pump inlets, or chamber interfaces. Whether you’re retrofitting an existing setup or building a new system, this adapter offers a compact and dependable solution.

Key Features:

  • Straight Reducer Design
    Connects two different KF sizes in a straight line, making it ideal for tight system layouts where angular transitions are not desirable.

  • 304L Stainless Steel Build
    Offers excellent vacuum compatibility and resistance to oxidation, making it suitable for cleanroom and UHV-prep environments.

  • Standard KF Sizes Supported
    Available in configurations such as KF25 to KF16 or KF40 to KF25, compatible with standard KF hardware like clamps and centering rings.

  • Leak-Tight HV Performance
    Rated for vacuum pressures down to 10⁻⁷ torr when assembled correctly, making it reliable for demanding vacuum system operations.

  • Custom Options Available
    In addition to standard lengths and sizes, TFM can provide custom reducers tailored to unique layout or dimensional requirements.

Applications:

This adapter is commonly used to:

  • Bridge components with different KF flange sizes

  • Integrate sensors or instruments into lines without redesigning the full system

  • Streamline gas paths between roughing pumps and vacuum chambers

  • Facilitate modular builds in laboratories or pilot systems

TFM’s full KF flange product line includes straight and conical reducers, full and half nipples, as well as related sealing hardware. Whether for lab-scale setups or industrial equipment, our solutions are engineered to deliver performance and precision.

with precision and consistency.

Ordering Table

Flange Size/OD (Large) Flange Size/OD (Small) Part Number Drawing Flange Size/OD (Large)
KF25 (1.57" OD) KF10 (1.18" OD) QF25XQF10 Tooltip 304L SS
KF25 (1.57" OD) KF16 (1.18" OD) QF25XQF16 Tooltip 304L SS
KF40 (2.16" OD) KF10 (1.18" OD) QF40XQF10 Tooltip 304L SS
KF40 (2.16" OD) KF16 (1.18" OD) QF40XQF16 Tooltip 304L SS
KF40 (2.16" OD) KF25 (1.57" OD) QF40XQF25 Tooltip 304L SS
KF50 (2.95" OD) KF10 (1.18" OD) QF50XQF10 Tooltip 304L SS
KF50 (2.95" OD) KF16 (1.18" OD) QF50XQF16 Tooltip 304L SS
KF50 (2.95" OD) KF25 (1.57" OD) QF50XQF25 Tooltip 304L SS
KF50 (2.95" OD) KF40 (2.16" OD) QF50XQF40 Tooltip 304L SS

Accessories Table

Description For Per Package Part Number
Cast Clamps (SS) KF10, KF16 Flanges 1 QF16-075-CS
Cast Clamps (SS) KF25 Flanges 1 QF25-100-CS
Cast Clamps (SS) KF40 Flanges 1 QF40-150-CS
Cast Clamps (SS) KF50 Flanges 1 QF50-200-CS
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
Centering Ring (SS with Fluorocarbon O-Ring) KF10 Flanges 1 QF10-050-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF16 Flanges 1 QF16-075-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF25 Flanges 1 QF25-100-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF40 Flanges 1 QF40-150-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF50 Flanges 1 QF50-200-SRV
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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