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ASA HV Flanges – Rotatable Grooved

ASA HV Flanges – Fixed Grooved

ASA HV Flanges – Fixed Grooved: Reliable O-Ring Sealing for Permanently Aligned ASA Vacuum Connections

ASA HV Flanges – Fixed Grooved, manufactured by TFM, are essential sealing components designed for high-vacuum (HV) applications. Based on the ASA (American Standard Adapter) flange standard—originally derived from 150# steam-pipe flanges—these fittings feature a machined groove to seat an o-ring, forming a sexed vacuum seal when compressed against a flat flange.

Unlike their rotatable counterparts, fixed grooved flanges are permanently welded or brazed into position. This makes them ideal for applications where precise orientation, structural rigidity, or long-term stability is required.

Each flange is fabricated from 304L stainless steel, offering excellent weldability, corrosion resistance, and mechanical strength, suitable for both laboratory and industrial HV environments.

Key Features of ASA HV Flanges – Fixed Grooved:

  • Grooved Flange for O-Ring Sealing
    Designed to interface with flat ASA flanges, forming a secure, leak-tight seal via elastomeric o-ring compression.

  • Fixed Welded Configuration
    Provides a rigid, non-rotating mount—ideal for permanent installations where bolt hole alignment is predetermined.

  • 304L Stainless Steel Construction
    Offers resistance to corrosion, thermal cycling, and high-vacuum exposure, making it suitable for cleanroom, R&D, and process vacuum systems.

  • Sized by Nominal Pipe I.D.
    Available sizes: 1″, 1.5″, 2″, 3″, 4″, 6″, 8″, and 10″, referencing the nominal inner diameter of the connecting pipe.

  • Large Bolt Circle
    Like all ASA flanges, these include oversized bolt holes on a wide rim, ensuring robust mechanical fastening.

  • Application Limits (based on o-ring material):
    – Temperature Range: ~0 °C to 120–180 °C
    – Pressure Range: From atmospheric pressure down to ~10⁻⁷ torr

Applications:

  • High-vacuum piping and pump line connections

  • Chamber flanges requiring permanent alignment

  • Process ports in semiconductor or aerospace vacuum tools

  • Diagnostic modules with fixed mechanical orientation

  • Industrial HV systems that demand structural sealing integrity

TFM also offers flat ASA flanges, rotatable grooved flanges, elastomeric o-rings (FKM, Buna-N), and bolt hardware sets, allowing customers to configure complete ASA-standard vacuum interfaces.

In conclusion, ASA HV Flanges – Fixed Grooved provide a durable, vacuum-tight, and structurally fixed sealing option for critical HV applications. Their precision groove design and solid stainless steel construction ensure long-lasting performance and system compatibility.

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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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