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KF (QF) HV 4-Way Standard Crosses

KF (QF) HV 4-Way Standard Crosses

KF (QF) HV 4-Way Standard Crosses: Precision Vacuum Connectivity for High-Purity Systems

In high-vacuum environments where precision, modularity, and cleanliness are paramount, KF (QF) HV 4-Way Standard Crosses serve as vital components for routing vacuum lines with consistency and efficiency. These fittings are engineered to connect four vacuum ports of the same KF (QF) flange size in a cross configuration, enabling symmetrical distribution of vacuum or gas flow across systems that demand tight control and minimal contamination.

Manufactured from high-grade 304 or 316L stainless steel, KF (QF) HV 4-Way Standard Crosses offer robust mechanical strength and long-lasting resistance to corrosion. This makes them ideal for deployment in a wide range of vacuum systems—from academic research labs to semiconductor fabrication facilities and analytical instrumentation setups. The stainless-steel construction is complemented by a smooth, vacuum-compatible surface finish that minimizes trapped particles and outgassing, helping maintain stable pressure conditions even under high-vacuum operation down to 10⁻⁸ Torr.

One of the main advantages of using KF (QF) HV 4-Way Standard Crosses is the speed and simplicity of installation. Each port on the cross features a KF (QF) flange, which is part of a standardized quick-release vacuum interface system. Using centering rings with O-rings and clamp-style fasteners, technicians can assemble and disassemble these crosses without tools, significantly reducing downtime during maintenance or reconfiguration. This tool-free design is especially valuable in cleanroom and high-throughput environments, where system flexibility and rapid component swapping are often essential.

Functionally, KF (QF) HV 4-Way Standard Crosses allow engineers to build modular vacuum networks with precision and repeatability. Whether you are integrating gauges, valves, viewports, or connecting vacuum lines in multiple directions, the 4-way cross provides a centralized hub that simplifies layout and reduces the need for additional fittings or complex piping. The result is a cleaner, more compact system architecture with fewer leak paths and reduced pressure loss.

The standardized flange size of each port also ensures compatibility across a wide range of KF vacuum components. Whether your system uses KF16, KF25, KF40, or KF50 connections, TFM offers a selection of 4-way standard crosses to match your configuration. Additionally, the symmetrical geometry ensures even distribution of flow and consistent pressure across all branches, which is especially important in applications involving vacuum balancing or gas mixing.

In demanding applications such as mass spectrometry, vacuum deposition, or beamline instrumentation, maintaining a stable vacuum is non-negotiable. KF (QF) HV 4-Way Standard Crosses meet these challenges by providing leak-tight performance, mechanical reliability, and chemical compatibility, all within a compact and easy-to-integrate form factor.

TFM supplies high-quality KF (QF) HV 4-Way Standard Crosses in multiple flange sizes, with options for electropolished surfaces or custom fabrication available on request. Whether you’re building a new vacuum setup or upgrading an existing one, these crosses provide the performance, compatibility, and reliability needed for today’s precision vacuum systems.

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Wall Thickness Part Number
KF16 (1.18" OD) Cross, 4-Way 304L SS Tooltip 3/4 0.065 QF16-075-X
KF16 (1.18" OD) Cross, 4-Way 6061-T6 Aluminum Tooltip 7/8 0.144 QF16-075-XAL
KF25 (1.57" OD) Cross, 4-Way 304L SS Tooltip 1 0.065 QF25-100-X
KF25 (1.57" OD) Cross, 4-Way 6061-T6 Aluminum Tooltip 1.28 0.168 QF25-100-XAL
KF40 (2.16" OD) Cross, 4-Way 304L SS Tooltip 1-1/2 0.065 QF40-150-X
KF40 (2.16" OD) Cross, 4-Way 6061-T6 Aluminum Tooltip 1.83 0.108 QF40-150-XAL
KF50 (2.95" OD) Cross, 4-Way 304L SS Tooltip 2 0.065 QF50-200-X

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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