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

KF (QF) Nipples for High Vacuum Systems

We produce KF (QF) nipples (spools) designed for high vacuum (HV) systems, crafted from durable tubing and KF flanges. The KF (QF) flange is ideal for through- or foreline vacuum plumbing and serves as a straightforward solution for HV chamber ports.

Features of KF Nipples

  • Half Nipples: Each half nipple is equipped with one KF flange, making it a compact option for various applications.
  • Full Nipples: Full nipples come with two KF flanges, providing enhanced connectivity and stability in your vacuum system.
  • Reducer Nipples: Available in both conical and straight designs, these reducer nipples are engineered to accommodate two different flange sizes, ensuring versatility in system configurations.
  • Customization Options: We offer a variety of common lengths and tube diameters. Please contact us with your specific requirements for tailored solutions.

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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