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KF (QF) HV Radius 180° Returns

KF (QF) HV Radius 180° Returns

KF (QF) HV Radius 180° Returns are specialized vacuum components designed to allow a smooth 180-degree directional change in high-vacuum (HV) and ultra-high-vacuum (UHV) systems. These precision-engineered returns minimize turbulence and pressure drops, ensuring optimal gas flow and system efficiency.

Key Features

  • Material: Made from high-purity stainless steel (304L or 316L) for durability, corrosion resistance, and minimal outgassing.

  • Optimized Bend Radius: Ensures low resistance and improved conductance, reducing flow restrictions in vacuum lines.

  • KF (QF) Flange Connection: Compatible with ISO-KF (QF) vacuum fittings, allowing for easy assembly and disassembly without welding.

  • Leak-Tight Construction: Precision welding and machining ensure airtight sealing for HV/UHV applications.

  • Custom Sizes Available: Manufactured in various diameters and wall thicknesses to suit different system requirements.

Applications

  • Vacuum Processing Systems: Used in semiconductor fabrication, thin film coating, and plasma applications.

  • Laboratory & Research Equipment: Ideal for mass spectrometry, space simulation chambers, and accelerator technology.

  • Industrial High-Vacuum Systems: Supports chemical processing, pharmaceutical production, and aerospace engineering.

  • Cleanroom & High-Purity Environments: Designed for contamination-free vacuum setups.

Why Choose TFM’s KF (QF) HV Radius 180° Returns?

  • High-precision manufacturing ensures reliability in HV/UHV systems

  • Constructed from premium materials for long-term performance

  • Leak-tight and corrosion-resistant design

  • Custom sizes and configurations available upon request

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Wall Thickness Part Number
KF16 (1.18" OD) Return 304L SS Tooltip 3/4 0.065 QF16-075E180
KF25 (1.57" OD) Return 304L SS Tooltip 1 0.065 QF25-100E180
KF40 (2.16" OD) Return 304L SS Tooltip 1-1/2 0.065 QF40-150E180
KF50 (2.95" OD) Return 304L SS Tooltip 2 0.065 QF50-200E180

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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