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KF (QF) HV Conical Reducer Nipples (Aluminum 6061-T6)

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

KF (QF) HV Conical Reducer Nipples (304L SS): Tapered Stainless Steel Connectors for KF Flange Transitions in HV Systems

The KF (QF) HV Conical Reducer Nipples (304L SS) from TFM are engineered to provide smooth, tapered transitions between different KF flange sizes within high vacuum systems. Featuring a conical geometry, these reducer nipples are designed to optimize gas flow while maintaining axial alignment and structural integrity. Each unit is manufactured from 304L stainless steel, a vacuum-compatible alloy known for its corrosion resistance and thermal stability.

Whether you’re integrating components with different flange sizes or reconfiguring a foreline path, KF (QF) HV Conical Reducer Nipples (304L SS) offer a reliable and compact solution for managing vacuum connections.

Key Features of KF (QF) HV Conical Reducer Nipples (304L SS):

  • Conical Geometry for Flow Optimization
    The tapered internal design of these nipples reduces turbulence and pressure drop, ideal for maintaining system efficiency across flange transitions.

  • Dual KF Flange Interfaces
    Each nipple connects two different KF (QF) flange sizes—such as KF40 to KF25—using standard centering rings and clamps for quick, tool-free assembly.

  • 304L Stainless Steel Construction
    These KF (QF) HV Conical Reducer Nipples (304L SS) are built for durability and UHV compatibility, making them suitable for demanding scientific and industrial environments.

  • High Vacuum Performance
    Rated for use in systems operating down to 10⁻⁷ torr, these reducer nipples maintain leak-tight performance when used with proper sealing hardware.

  • Standard and Custom Configurations
    TFM provides a range of common flange combinations and lengths, and can manufacture custom KF (QF) HV Conical Reducer Nipples (304L SS) to meet specific application requirements.

Applications:

  • Transitioning between mismatched KF flanges in HV plumbing

  • Connecting pumps, gauges, or chambers with different port sizes

  • Reducing line diameter while maintaining consistent vacuum flow

  • Integrating sensitive instruments into tapered foreline designs

  • Supporting modular and retrofitted vacuum setups with high sealing reliability

TFM offers a comprehensive selection of KF components, including straight and conical reducer nipples, half and full nipples, and all required sealing accessories. Whether you’re assembling a new system or modifying an existing one, KF (QF) HV Conical Reducer Nipples (304L SS) ensure dependable and efficient performance.

Ordering Table

Flange Size/OD (Large) Flange Size/OD (Small) Type Flange Material Drawing Bore Overall Length Part Number
KF25 (1.57" OD) KF16 (1.18" OD) Reducing Nipple, Conical 304L SS Tooltip 0.63 1.57 QF25XQF16C
KF40 (2.16" OD) KF16 (1.18" OD) Reducing Nipple, Conical 304L SS Tooltip 0.63 1.57 QF40XQF16C
KF40 (2.16" OD) KF25 (1.57" OD) Reducing Nipple, Conical 304L SS Tooltip 0.88 1.57 QF40XQF25C
KF50 (2.95" OD) KF16 (1.18" OD) Reducing Nipple, Conical 304L SS Tooltip 0.63 1.57 QF50XQF16C
KF50 (2.95" OD) KF25 (1.57" OD) Reducing Nipple, Conical 304L SS Tooltip 0.88 1.57 QF50XQF25C
KF50 (2.95" OD) KF40 (2.16" OD) Reducing Nipple, Conical 304L SS Tooltip 1.63 1.57 QF50XQF40C

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

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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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