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ISO-K HV Centering Ring with Outer Ring (316/Ti/1.4571 SS)

ISO-K HV Centering Ring with Outer Ring (316/Ti/1.4571 SS)

ISO-K HV Centering Ring with Outer Ring (316/Ti/1.4571 SS): Superior Sealing Performance for Harsh Vacuum Applications

ISO-K HV Centering Rings with Outer Ring (316/Ti/1.4571 Stainless Steel) are premium-grade sealing components designed for ISO-K vacuum flange systems operating under high-vacuum (HV) conditions. These centering rings feature a dual-ring construction—an inner elastomeric o-ring and an outer metal alignment ring—engineered for applications where long-term stability, chemical resistance, and mechanical strength are critical.

At the heart of the assembly is the outer ring made of 316/Ti stainless steel (1.4571 grade), an austenitic alloy stabilized with titanium. This material offers exceptional resistance to pitting, intergranular corrosion, and chloride-induced cracking, making it ideal for corrosive gas environments, cleanroom systems, and high-temperature vacuum applications.

Key Features of ISO-K HV Centering Ring with Outer Ring (316/Ti/1.4571 SS):

  • ISO-K Flange Compatibility
    Specifically designed to fit between ISO-K flanges, ensuring proper alignment and consistent compression when used with ISO centering clamps.

  • Advanced Stainless Steel Construction
    The outer ring is made from 316Ti stainless steel (DIN 1.4571)—offering excellent resistance to chemical attack and oxidation, even during prolonged thermal cycling or bake-outs.

  • Vacuum-Grade Elastomeric O-Ring
    Supplied with a high-purity FKM (Viton®) o-ring by default, offering vacuum compatibility down to 10⁻⁸ Torr and temperature resistance up to 200 °C. Other o-ring materials are available on request.

  • Improved Structural Stability
    The rigid outer ring prevents lateral deformation of the o-ring during flange tightening, improving sealing consistency and reducing risk of o-ring extrusion under vacuum pressure differentials.

  • Reusable and Maintenance-Friendly
    Suitable for modular or reconfigurable vacuum systems where components are frequently disassembled and reassembled. The precision-machined outer ring allows reliable repositioning and long-term use.

Applications Include:

  • High-purity vacuum gas delivery systems

  • Semiconductor process equipment

  • Corrosive chemical vapor deposition (CVD) environments

  • Vacuum furnaces and thermal process chambers

  • Ultra-high vacuum (UHV) setups requiring structural rigidity and corrosion resistance

TFM supplies ISO-K HV Centering Rings with Outer Ring (316/Ti/1.4571 SS) in standard ISO sizes including ISO63, ISO100, ISO160, ISO200, ISO250, and larger. Each unit is manufactured to tight dimensional tolerances and thoroughly cleaned for vacuum service. Customizations—such as alternative o-ring compounds (e.g., EPDM, silicone, Chemraz®) or vent holes for differential pumping—are available upon request.

In summary, ISO-K HV Centering Ring with Outer Ring (316/Ti/1.4571 SS) is the optimal choice for engineers and system designers working in chemically aggressive or thermally demanding vacuum environments. Its robust construction, ISO compliance, and superior sealing performance make it an essential component for high-reliability vacuum flange assemblies.

Ordering Table

Drawing Flange OD Reference Dim A Dim B Dim C Dim D Dim E O-Ring Material Part Number
Tooltip ISO63-K Aluminum Outer Ring/316Ti SS Inner Ring 2.76 2.68 0.154 0.315 0.210 Fluorocarbon (FKM) QF63-STAVR
Tooltip ISO80-K Aluminum Outer Ring/316Ti SS Inner Ring 3.27 3.19 0.154 0.315 0.210 Fluorocarbon (FKM) QF80-STAVR
Tooltip ISO100-K Aluminum Outer Ring/316Ti SS Inner Ring 4.02 3.94 0.154 0.315 0.210 Fluorocarbon (FKM) QF100-STAVR
Tooltip ISO160-K Aluminum Outer Ring/316Ti SS Inner Ring 6.02 5.94 0.154 0.315 0.210 Fluorocarbon (FKM) QF160-STAVR
Tooltip ISO200-K Aluminum Outer Ring/316Ti SS Inner Ring 8.39 8.31 0.154 0.315 0.210 Fluorocarbon (FKM) QF200-STAVR
Tooltip ISO250-K Aluminum Outer Ring/316Ti SS Inner Ring 10.28 10.20 0.154 0.315 0.210 Fluorocarbon (FKM) QF250-STAVR

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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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