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ISO-F HV Retaining Rings

ISO-F HV Retaining Rings

ISO-F HV Retaining Rings: Lightweight Aluminum Coupling for ISO-K to ISO-F High-Vacuum Flange Transitions

ISO-F HV Retaining Rings are specialized components used in high-vacuum (HV) systems to securely mate ISO-K flanges to ISO-F flanges of the same nominal size. Designed as a functional bridge between the two standard ISO flange styles, these retaining rings ensure proper alignment and mechanical fastening of hybrid flange connections in systems where clamp-fastened and bolt-fastened components are used together.

TFM manufactures these ISO-F HV Retaining Rings from lightweight aluminum, providing strength and corrosion resistance while minimizing the overall mass of the vacuum assembly. Their low weight is particularly advantageous in vertically mounted equipment, mobile platforms, or applications where component handling ease and installation speed are priorities.

Unlike full bolt rings, ISO-F HV Retaining Rings serve as replacement or supplementary connectors and are specifically designed to support mating between ISO-K and ISO-F styles. These rings do not include the bolt ring itself, making them an ideal maintenance or system expansion part when only the interface ring is needed and existing hardware is reused.

Key Features of ISO-F HV Retaining Rings:

  • ISO-K to ISO-F Compatibility
    Designed to securely join ISO-K clamp-style flanges with ISO-F bolt-style flanges of equal size, maintaining flange alignment and sealing pressure.

  • Aluminum Construction
    Offers excellent corrosion resistance and mechanical rigidity while keeping weight low—ideal for general-purpose HV applications.

  • Vacuum Integrity Support
    Ensures proper compression of the o-ring in conjunction with standard ISO centering rings, supporting vacuum levels down to 10⁻⁸ Torr when assembled correctly.

  • Replacement Friendly
    Intended for use as replacement parts, these retaining rings do not include bolt rings or fastening hardware, making them a cost-effective solution for field maintenance or equipment upgrades.

These ISO-F HV Retaining Rings are compatible with all standard ISO flange sizes, including ISO63, ISO100, ISO160, ISO200, ISO250, ISO320, and ISO400. Each ring is machined to precision tolerances to ensure accurate mating and consistent flange performance. For specialized configurations, TFM can provide custom retaining ring designs with features such as vent holes, surface treatments, or engraved part numbers for traceability.

In summary, ISO-F HV Retaining Rings are a practical and efficient solution for mating ISO-K and ISO-F flanges in high-vacuum systems. Their lightweight aluminum construction, ISO compatibility, and role-specific design make them an essential utility for vacuum system maintenance, assembly, and hybrid flange integration.

Ordering Table

Flange OD Reference Part Number
ISO63 Retaining Ring QF63-RR
ISO80 Retaining Ring QF80-RR
ISO100 Retaining Ring QF100-RR
ISO160 Retaining Ring QF160-RR
ISO200 Retaining Ring QF200-RR
ISO250 Retaining Ring QF250-RR
ISO320 Retaining Ring QF320-RR
ISO400 Retaining Ring QF400-RR
ISO500 Retaining Ring QF500-RR

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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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