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KF (QF) HV Blank Flanges (Brass)

KF (QF) HV Blank Flanges (304L SS)

Introduction

KF (QF) HV Blank Flanges made from 304L stainless steel are essential components for sealing unused ports in high vacuum (HV) systems. These flanges provide a simple yet highly reliable solution for maintaining vacuum integrity during system setup, maintenance, or expansion. Their compatibility with standardized KF (QF) connections makes them widely used in laboratories, semiconductor equipment, and industrial vacuum systems.

Detailed Description

KF (QF) blank flanges are precision-machined discs designed to cap off open vacuum ports, preventing air ingress and contamination. Manufactured from 304L stainless steel, these flanges offer excellent corrosion resistance, low carbon content for improved weldability, and reduced outgassing—critical for maintaining stable vacuum conditions.

The KF (Quick Flange) system is based on a centering ring and clamp mechanism, allowing fast assembly and disassembly without the need for bolts. When combined with an appropriate elastomer O-ring (typically Viton®), KF blank flanges provide a dependable vacuum seal suitable for HV environments.

The surface finish and dimensional accuracy of the flange are crucial to ensure proper sealing and minimize leak rates. High-quality machining ensures flat sealing surfaces and consistent tolerances, enabling repeated use without compromising performance. These blank flanges are available in a range of standard sizes and can be customized for specific system requirements.

Applications

KF (QF) HV Blank Flanges (304L SS) are widely used in:

  • Vacuum System Sealing: Closing unused ports in HV systems
  • Thin Film Deposition Equipment: PVD, CVD, and evaporation systems
  • Semiconductor Manufacturing: Temporary or permanent port sealing
  • Analytical Instruments: Mass spectrometers and vacuum test setups
  • Research Laboratories: Flexible system configuration and maintenance

Technical Parameters

ParameterTypical Value / RangeImportance
Material304L Stainless SteelCorrosion resistance & low outgassing
Flange TypeKF (QF)Standard HV quick connection
Nominal SizeKF10 – KF100 (custom available)System compatibility
Sealing MethodO-ring (Viton® or equivalent)Ensures leak-tight seal
Surface Finish≤ 0.8 μm Ra (typical)Improves sealing performance
Leak Rate≤ 1 × 10⁻⁹ mbar·L/sMaintains vacuum integrity
ReusabilityHighSuitable for repeated use

Comparison with Related Flanges

Flange TypeKey AdvantageTypical Application
KF Blank FlangeQuick installation, reusableHV systems, labs
CF Blank FlangeMetal seal, UHV compatibilityUltra-high vacuum
ISO Blank FlangeSuitable for large diametersIndustrial vacuum lines
ASA Blank FlangeFlat-face sealingSpecialized systems

FAQ

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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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