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ISO HV Centering Rings with Screens

ISO HV Centering Rings with Screens

ISO HV Centering Rings with Screens: Built-In Filtration for Cleaner High-Vacuum Operation

ISO HV Centering Rings with Screens are dual-purpose sealing and filtration components engineered for high-vacuum (HV) systems that utilize ISO standard flanges. These specialized centering rings combine a stainless steel ring, a fluorocarbon (FKM) o-ring, and an integrated #6 mesh stainless steel screen, offering both vacuum sealing and particle filtration in a single assembly.

Designed primarily for use at the inlet of mechanical vacuum pumps, these ISO HV Centering Rings with Screens act as a first line of defense against system contamination. By preventing loose particulates, metal flakes, or gasket fragments from entering the pump, they help extend equipment life and maintain operational integrity in vacuum plumbing lines, forelines, and basic HV chamber ports.

Key Features of ISO HV Centering Rings with Screens:

  • Dual Function: Seal + Filter
    Each centering ring provides both the standard KF/ISO vacuum seal and an in-line particulate barrier via a robust stainless steel mesh.

  • High-Quality Materials
    Constructed with a stainless steel ring for durability, a fluorocarbon (FKM) o-ring for high vacuum and temperature compatibility, and a #6 wire mesh screen for particle filtration.

  • Mesh Specifications

    • Mesh Size: 6 × 6 squares per inch

    • Wire Gauge: 20 SWG (0.9 mm diameter)

    • Square Opening: 3.33 mm

  • Application Focused
    Optimized for installation at the inlet of mechanical pumps, these centering rings help protect rotary vane pumps and dry pumps from particulate ingress during chamber venting, tool maintenance, or system instability.

  • Standard ISO Compatibility
    Compatible with ISO-K and ISO-F flange systems in sizes including ISO63, ISO100, ISO160, ISO200, and larger. Each ring fits precisely between mating flanges, ensuring proper alignment and sealing force for vacuum integrity.

The use of fluorocarbon (FKM) o-rings ensures chemical resistance and thermal stability for a wide range of HV applications. These o-rings are suitable for operating temperatures between -20 °C to +200 °C, and maintain sealing performance under vacuum levels down to 10⁻⁸ Torr.

Common Applications Include:

  • Inlet protection for mechanical vacuum pumps

  • Foreline filtration in vacuum processing systems

  • Chamber protection during venting and purge cycles

  • Preventive maintenance in analytical and thin-film systems

TFM also offers ISO HV Centering Rings without screens for standard applications where debris filtration is not required, as well as custom centering rings with specialized mesh ratings, alternate elastomer types (e.g., Buna, EPDM, silicone), and metal screens for reactive or corrosive environments.

Dimensional Drawings

Ordering Table

Drawing Flange OD Dim A Dim B Note Part Number
Tooltip ISO63 2.76 3.4 1 QF63-SRV-SM
Tooltip ISO80 3.27 3.97 — QF80-SRV-SM
Tooltip ISO100 4.02 4.63 — QF100-SRV-SM
Tooltip ISO160 6.02 6.64 — QF160-SRV-SM
Tooltip ISO200 8.38 8.90 — QF200-SRV-SM

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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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