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KF (QF) to Hose Nozzle

KF (QF) to Hose Nozzle

Introduction

KF (QF) to Hose Nozzle adapters provide a simple and reliable interface between standard KF (Quick Flange) vacuum components and flexible hoses. These fittings are widely used in rough and medium vacuum systems where fast assembly, flexibility, and ease of maintenance are essential. By combining a KF flange connection with a hose nozzle, they enable efficient transitions between rigid vacuum hardware and soft hose lines.

Detailed Description

The KF (QF) to Hose Nozzle adapter is designed with a standard ISO-KF flange on one end and a precision-machined hose nozzle (hose barb) on the other. The KF side connects quickly using a centering ring, elastomer O-ring, and clamp, allowing tool-free installation and removal. This makes the adapter ideal for systems that require frequent reconfiguration or servicing.

The hose nozzle end securely grips flexible vacuum hoses, typically PVC, rubber, or reinforced vacuum tubing. The barb geometry ensures a tight mechanical hold, minimizing the risk of hose slippage under vacuum or slight positive pressure conditions. Hose clamps can be added for additional security where required.

Adapters are commonly manufactured from stainless steel (304 or 316L) or aluminum. Stainless steel versions offer superior corrosion resistance, mechanical strength, and compatibility with a wide range of vacuum and industrial environments, while aluminum versions provide lightweight handling and cost efficiency. Smooth internal surfaces help reduce turbulence and particle generation in the vacuum line.

Applications

KF (QF) to Hose Nozzle adapters are commonly used in:

  • Rough and medium vacuum systems

  • Vacuum pumps and foreline connections

  • Laboratory vacuum setups and test rigs

  • Leak detection and vacuum diagnostics

  • Packaging, drying, and degassing equipment

  • Temporary or flexible vacuum hose connections

Technical Parameters

ParameterTypical Value / RangeImportance
Flange StandardKF10 / KF16 / KF25 / KF40 / KF50Ensures compatibility with ISO-KF systems
Hose Size6 – 38 mm (custom options)Matches common vacuum hose diameters
Material304 / 316L Stainless Steel, AluminumDetermines corrosion resistance and durability
Sealing MethodO-ring with centering ringEnables quick, reliable vacuum sealing
Operating PressureAtmosphere to ~10⁻³ mbarSuitable for rough and medium vacuum
TemperatureLimited by O-ring materialDefines safe operating conditions

Comparison with Related Adapters

Adapter TypeKey AdvantageTypical Application
KF (QF) to Hose NozzleFlexible, quick-connectVacuum pump forelines
KF to KF NippleRigid vacuum connectionModular vacuum piping
KF to Threaded AdapterThreaded hose or fittingsInstrument connections

FAQ

QuestionAnswer
Is the KF and QF designation the same?Yes. KF and QF are commonly used interchangeably for ISO-KF flanges.
Do I need a clamp and centering ring?Yes, standard KF clamps and centering rings are required for sealing.
Can different hose sizes be supplied?Yes, hose nozzle diameters can be customized.
Is it suitable for high vacuum?It is typically used for rough to medium vacuum due to hose limitations.
Are different O-ring materials available?Yes, options such as NBR, FKM (Viton®), and others are available.

Packaging

Each KF (QF) to Hose Nozzle adapter is individually cleaned, capped, and packaged to prevent contamination. Protective cushioning and clear labeling ensure safe storage, easy identification, and damage-free transportation.

Conclusion

KF (QF) to Hose Nozzle adapters offer a practical and versatile solution for connecting flexible hoses to ISO-KF vacuum systems. Their quick-connect design, secure hose retention, and material options make them indispensable components in laboratory, industrial, and process vacuum applications.

For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.

Ordering Table

Flange Size/OD Type Drawing Dim A Dim B Dim C Dim D Part Number
KF16 (1.18" OD) Aluminum Tooltip 1.57 1.18 0.28 0.47 QF16-050-AHA
KF16 (1.18" OD) Stainless Steel Tooltip 1.57 1.18 0.28 0.47 QF16-050-SHA
KF25 (1.57" OD) Aluminum Tooltip 1.57 1.57 0.28 0.47 QF25-050-AHA
KF25 (1.57" OD) Stainless Steel Tooltip 1.57 1.57 0.28 0.47 QF25-050-SHA
KF40 (2.16" OD) Aluminum Tooltip 1.57 2.17 0.28 0.47 QF40-050-AHA
KF40 (2.16" OD) Stainless Steel Tooltip 1.57 2.17 0.28 0.47 QF40-050-SHA
KF50 (2.95" OD) Aluminum Tooltip 1.57 2.95 0.28 0.47 QF50-050-AHA
KF50 (2.95" OD) Stainless Steel Tooltip 1.57 2.95 0.28 0.47 QF50-050-SHA

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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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