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KF (QF) HV to Test Port Adapter

KF (QF) HV to Test Port Adapter

KF (QF) HV to Test Port Adapter: Flexible Interface for High-Vacuum Testing Applications

The KF (QF) HV to Test Port Adapter from TFM is purpose-built for integrating KF vacuum flange systems with common test port interfaces, streamlining diagnostic and performance testing operations in high-vacuum environments. This adapter is especially suited for temporary or modular setups where a vacuum line must connect quickly and reliably to 1-1/8” or 2” outer diameter test ports.

Engineered from 304 stainless steel, this adapter offers excellent durability, corrosion resistance, and vacuum compatibility. The KF (QF) flange side provides a quick-clamp interface commonly used in high-vacuum (HV) plumbing, while the opposite end features a smooth cylindrical tube, dimensioned to fit tightly into standardized test ports without threading or welding.

Key Features of KF (QF) HV to Test Port Adapter:

  • Dual-Diameter Compatibility
    Designed to fit either 1-1/8″ or 2″ O.D. test ports, allowing flexible integration across different chamber or manifold test systems.

  • KF Flange Interface
    Available in sizes such as KF16, KF25, and KF40, enabling easy clamp-on connection to roughing lines, test equipment, or chamber ports using standard centering rings and clamps.

  • High Vacuum Performance
    Compatible with HV systems operating down to 10⁻⁷ torr, when used with appropriate o-rings and centering rings.

  • 304 Stainless Steel Construction
    Provides mechanical strength, chemical resistance, and cleanroom compatibility for repeated use in demanding environments.

  • Non-Threaded Test Port End
    Smooth outer tube design allows easy insertion into test ports—no additional sealing threads or compression fittings required.

Applications:

  • Temporary vacuum line connection for system leak checking or roughing

  • Connecting diagnostic tools or gauges via KF plumbing to test port openings

  • Adapting test benches or vacuum chambers with non-flanged port geometries

  • Quick setup for portable pump-down systems in lab or field environments

  • Ideal for use in research labs, QA testing, and semiconductor vacuum validation

TFM also offers a range of KF to baseplate adapters, KF to hose barb adapters, and KF to Welch pump inlet couplings, ensuring seamless integration across diverse vacuum setups.

In conclusion, the KF (QF) HV to Test Port Adapter is a rugged, versatile tool that simplifies the connection between KF vacuum systems and standardized test ports. Whether you’re setting up for leak tests, pressure calibration, or vacuum validation, this adapter ensures a tight fit, clean performance, and minimal setup time.

Ordering Table

Flange Size/OD Drawing Test Port OD VacuCADSM Part Number
KF16 (1.18" OD) Tooltip 1.13 N/A QF16-112LD
KF16 (1.18" OD) Tooltip 2 N/A QF16-200LD
KF25 (1.57" OD) Tooltip 1.13 N/A QF25-112LD
KF40 (2.16" OD) Tooltip 1.13 N/A QF40-112LD
KF50 (2.95" OD) Tooltip 1.13 N/A QF50-112LD
KF50 (2.95" OD) Tooltip 2 N/A QF50-200LD

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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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