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ISO HV Flange Caps

ISO HV Flange Caps

ISO HV Flange Caps: Secure and Reusable Sealing for High-Vacuum ISO Flange Connections

ISO HV Flange Caps are essential components used to seal off unused ports in high-vacuum (HV) systems that utilize ISO-standard flanges, such as ISO-K or ISO-F. These caps provide a reliable vacuum seal while allowing flexibility for future system modifications, maintenance, or staged expansion. Designed to conform to international ISO standards, these flange caps are widely used in research laboratories, industrial vacuum processes, and vacuum packaging systems.

Manufactured from durable materials such as aluminum or 304L stainless steel, ISO HV Flange Caps offer robust performance under vacuum conditions. The caps are available in blank (non-bored) form and are designed to mate with ISO flanges via clamps and sealing rings. When properly assembled using elastomeric o-rings and clamp collars (for ISO-K) or bolts and washers (for ISO-F), these caps deliver vacuum-tight performance suitable for pressures as low as 10⁻⁸ Torr.

These flange caps are especially useful in vacuum systems where some ISO ports must be temporarily sealed—for example, during chamber venting, system maintenance, equipment upgrades, or the future integration of diagnostic tools. The reusability of ISO HV Flange Caps makes them more economical than welded blanks and ideal for flexible or reconfigurable system architectures.

Key benefits of ISO HV Flange Caps include:

  • Vacuum Compatibility: Rated for HV and UHV applications.

  • Material Options: Typically offered in 304L stainless steel for harsh environments or aluminum for general-purpose use and weight-sensitive setups.

  • Seal Reliability: Designed to compress evenly with standard ISO elastomeric seals (Viton, Buna-N, etc.).

  • Tool-Friendly Assembly: Compatible with ISO standard fastening methods including quick-clamp (ISO-K) and bolt ring (ISO-F) systems.

TFM supplies ISO HV Flange Caps in all common ISO sizes—ISO63, ISO100, ISO160, ISO200, ISO250, ISO320, and ISO400—with smooth surface finishes and precise machining to ensure tight sealing and repeatable performance. Custom modifications, including vent holes, engraved labels, or specialized coatings, are available upon request to meet application-specific requirements.

In summary, ISO HV Flange Caps are critical components for managing unused ISO ports in high-vacuum infrastructure. Their durability, compatibility with ISO sealing hardware, and easy reusability make them an indispensable part of any flexible vacuum system.

Ordering Table

Flange OD Per Package Part Number
ISO63 10 QF63CAP
ISO80 10 QF80CAP
ISO100 10 QF100CAP
ISO160 10 QF160CAP
ISO200 10 QF200CAP
ISO250 10 QF250CAP
ISO320 10 QF320CAP

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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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