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ASA HV Tees (Grooved & Flat Flanges)

ASA HV Tees (Flat Flanges)

ASA HV Tees (Flat Flanges): Precision-Fit Three-Way Connections for Grooved ASA Flange Systems

ASA HV Tees (Flat Flanges) from TFM are engineered to deliver dependable three-axis connections in high-vacuum (HV) environments where grooved ASA flanges and o-ring sealing are already in use. These tees are manufactured from high-purity 304L stainless steel tubing, offering exceptional strength, vacuum compatibility, and corrosion resistance under demanding process conditions.

Each port features a rotatable flat ASA flange, designed to mate with grooved flanges that hold elastomeric o-rings. This standard sexed ASA sealing system is widely used across vacuum industries for its simplicity, performance, and interchangeability. The flat flanges compress against o-rings located in the grooved flanges to form a reliable, leak-tight seal.

Key Features of ASA HV Tees (Flat Flanges):

  • All-Flat ASA Flange Configuration
    All three ports are equipped with rotatable flat ASA flanges, ideal for mating with grooved ASA flanges that contain o-rings, supporting vacuum pressures down to 10⁻⁸ Torr.

  • 304L Stainless Steel Fabrication
    Offers excellent structural integrity, corrosion resistance, and compatibility with chemically reactive environments, thermal cycling, or cleanroom applications.

  • Rotatable Flange Design
    Facilitates easier alignment and integration into tight or complex vacuum system geometries.

  • Leak-Tested and Vacuum Cleaned
    Each ASA HV Tee (Flat Flanges) undergoes helium leak testing and is cleaned to high-vacuum standards to ensure minimal outgassing and reliable performance.

  • Reducer Tees Available
    TFM offers reducer versions of this tee, enabling connection between different ASA flange sizes (e.g., 4″ to 6″) for system flexibility.

  • Standard and Custom Sizing
    Available in ASA sizes such as 4″, 6″, 8″, 10″, and 12″, with support for custom tube lengths, wall thicknesses, and port orientations upon request.

Applications:

  • Connection of three grooved-flange components in vacuum manifolds

  • Distribution nodes in foreline or chamber plumbing

  • Gas inlet, exhaust, or diagnostic junctions

  • Retrofit expansion of ASA-standard systems

  • Modular vacuum routing in research and production platforms

TFM also supplies all necessary ASA-compatible hardware to complement these tees, including grooved flanges, o-rings (FKM, Buna-N), bolt kits, and blank-off plates.

In conclusion, ASA HV Tees (Flat Flanges) are the ideal solution for vacuum engineers needing to interface with grooved ASA flanges using a secure, o-ring sealed flat face. With full stainless steel construction and rotatable design, they ensure precision alignment, reliable sealing, and long-term performance in high-vacuum environments.

Ordering Table

Flange Size/OD Drawing Nominal Tube OD Dim A Part Number
ASA 1 (4.25" OD) Tooltip 1-1/2 2.5 AFT04X15R
ASA 1.5 (5.00" OD) Tooltip 2 3.25 AFT05X20R
ASA 1.5 (5.00" OD) Tooltip 2-1/2 3.25 AFT05X25R
ASA 2 (6.00" OD) Tooltip 3 3.5 AFT06X30R
ASA 3 (7.50" OD) Tooltip 4 5.12 AFT07X40R
ASA 4 (9.00" OD) Tooltip 4 5.12 AFT09X40R
ASA 4 (9.00" OD) Tooltip 6 5.25 AFT09X60R
ASA 6 (11.00" OD) Tooltip 6 6.44 AFT11X60R
ASA 6 (11.00" OD) Tooltip 8 7.38 AFT11X80R
ASA 8 (13.50" OD) Tooltip 10 9.88 AFT13X10R
ASA 8 (13.50" OD) Tooltip 8 7.75 AFT13X80R
ASA 10 (16.00" OD) Tooltip 10 9.88 AFT16X10R

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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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