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Miter 90° Elbows (ISO-K HV)

Miter 90° Elbows (ISO-K HV)

Introduction

Miter 90° Elbows (ISO-K HV) are precision-engineered vacuum components designed to change the direction of ISO-K high-vacuum piping by 90 degrees. These elbows are an essential part of vacuum plumbing systems, ensuring efficient space utilization and consistent flow without compromising vacuum integrity. They are commonly used in high and ultra-high vacuum (HV/UHV) systems across research, semiconductor, and industrial applications.

Detailed Description

Miter 90° elbows are constructed from high-quality stainless steel—typically 304L or 316L—for superior corrosion resistance, vacuum compatibility, and mechanical durability. The mitered geometry allows for a clean, sharp directional transition while maintaining consistent internal surface finish and cross-sectional area.

The ISO-K (also known as ISO Large Flange) standard uses clamp-style flanges for rapid assembly and disassembly. Each elbow is precisely welded, helium-leak tested, and internally polished to achieve high vacuum performance.

Key Features:

  • High-quality stainless steel (304L / 316L).

  • Miter-welded construction with smooth internal surfaces.

  • Compatible with ISO-K clamps and centering rings.

  • Leak-tested for HV/UHV performance.

  • Available in multiple diameters and custom lengths.

Applications

Miter 90° Elbows (ISO-K HV) are widely used in:

  • Vacuum coating systems – thin film deposition and sputtering setups.

  • Semiconductor process chambers – gas and vacuum distribution.

  • Analytical instruments – mass spectrometers, electron microscopes.

  • Research laboratories – beamlines and vacuum test systems.

  • Industrial vacuum systems – general-purpose vacuum plumbing.

Technical Parameters

ParameterTypical Value / RangeImportance
MaterialStainless Steel 304L / 316LCorrosion-resistant and vacuum compatible
Angle90° (Miter Type)Enables directional flow change
Flange TypeISO-K (Clamp)Quick assembly/disassembly
Diameter RangeDN63 – DN500Fits most HV pipelines
Leak Rate≤ 1×10⁻⁹ mbar · L/sEnsures high vacuum integrity
Surface Finish≤ Ra 0.8 μm (internal)Minimizes gas entrapment
Bakeout TemperatureUp to 200 °C (304L)Suitable for HV cleaning cycles

Comparison with Related Components

Component TypeKey AdvantageTypical Use
Miter 90° Elbow (ISO-K HV)Space-efficient sharp turnCompact vacuum systems
Radius Elbow (ISO-K HV)Reduced flow turbulenceHigh-flow lines
ISO-K Straight TubeDirect linear connectionsStandard vacuum lines
KF 90° Elbow (Small Flange)Lightweight, compact designSmall-scale setups

FAQ

QuestionAnswer
What’s the difference between ISO-K and ISO-F flanges?ISO-K uses clamps for quick connections, while ISO-F uses bolts.
Are these elbows UHV compatible?Yes, with electropolished interior and proper sealing materials.
Can custom lengths or angles be made?Yes, 45°, 60°, and custom miter angles are available on request.
What sealing method is used?Centering rings with Viton, NBR, or metal O-rings depending on application.
Are elbows cleaned for vacuum use?Yes, all elbows are degreased, particle-cleaned, and vacuum-packaged.

Packaging

Each Miter 90° Elbow (ISO-K HV) is individually bagged in a clean environment to prevent contamination. Components are protected with end caps, foam inserts, and packed in sturdy export-grade boxes.

Conclusion

The ISO-K HV Miter 90° Elbow combines precision welding, corrosion resistance, and high-vacuum reliability, offering dependable performance for modern vacuum systems. Its modular flange design enables easy integration and maintenance while maintaining excellent sealing performance.

For specifications, dimensions, and quotations, please contact us at [sales@thinfilmmaterials.com].

Ordering Table

Flange Size/OD Type Flange Material Drawing Nominal Tube OD Dim A Part Number
ISO63-K (3.74" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 2-1/2 3.46 QF63-E90K
ISO80-K (4.33" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 3 3.86 QF80-E90K
ISO100-K (5.12" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 4 4.25 QF100-E90K
ISO160-K (7.09" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 6 5.43 QF160-E90K
ISO200-K (9.45" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 8 6.61 QF200-E90K
ISO250-K (11.42" OD) Elbow, 90 Degree Mitered 304L SS Tooltip 10 8.19 QF250-E90K

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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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