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ASA HV Tees (Grooved & Flat Flanges)

ASA HV Tees (Grooved & Flat Flanges): Reliable Three-Way Sealing in ASA High-Vacuum Systems

ASA HV Tees (Grooved & Flat Flanges) from TFM are precision-engineered components used in high-vacuum (HV) systems that require dependable three-way connectivity. Constructed from 304L stainless steel tubing, these tees are designed with ASA-standard sexed flanges, providing a reliable sealing interface via a combination of grooved and flat flange ends.

The ASA flange system uses a grooved flange to retain an elastomeric o-ring, which mates against a smooth flat flange to form a tight vacuum seal when bolted together. TFM’s ASA HV tees allow flexible configuration across the run and branch axes, giving users the option to specify grooved or flat flanges as needed.

Key Features of ASA HV Tees (Grooved & Flat Flanges):

  • 304L Stainless Steel Construction
    Ensures long-term corrosion resistance, mechanical strength, and vacuum cleanliness—ideal for high-purity applications in R&D, semiconductor, and industrial sectors.

  • Rotatable ASA Flanges
    Each of the three ports features a rotatable ASA flange, configurable in any combination of grooved and flat sealing surfaces. This enables flexible integration with existing system hardware.

  • Sexed Sealing Interface
    Designed to meet ASA standards, one flange provides the o-ring groove while the mating flange offers a flat sealing face, forming a secure, leak-tight connection capable of reaching pressures as low as 10⁻⁸ Torr.

  • Reducer Tees Available
    TFM offers reducer versions of ASA HV Tees (Grooved & Flat Flanges), allowing users to join two different flange sizes for hybrid systems or expansion modules.

  • Standard and Custom Sizing Options
    Available in ASA sizes including 4″, 6″, 8″, 10″, and 12″, with customizable tube lengths, wall thicknesses, and flange orientations to meet specific engineering requirements.

Common Applications:

  • Pumping or gauge tee ports in high-vacuum chamber systems

  • Modular gas injection or exhaust paths

  • Three-way instrumentation branching

  • ASA infrastructure expansion or conversion

  • Custom foreline manifold design for lab or pilot systems

TFM provides ASA-compatible bolt sets, FKM or Buna-N o-rings, blank flanges, and adapter flanges to complete your vacuum system build efficiently and reliably.


In summary, ASA HV Tees (Grooved & Flat Flanges) offer a flexible and secure three-way vacuum connection with customizable flange sealing combinations. Whether you’re building a new vacuum infrastructure or upgrading an existing ASA system, these tees deliver robust performance and leak-tight reliability.

Ordering Table

Flange Size/OD Drawing Nominal Tube OD Grooved Flanges Dim A Part Number
ASA 1 (4.25" OD) Tooltip 1-1/2 Flange 1 2.5 AFT04X15G1R
ASA 1 (4.25" OD) Tooltip 1-1/2 Flange 3 2.5 AFT04X15G2R
ASA 1 (4.25" OD) Tooltip 1-1/2 Flanges 1 & 2 2.5 AFT04X15G3R
ASA 1 (4.25" OD) Tooltip 1-1/2 Flanges 1 & 3 2.5 AFT04X15G4R
ASA 1.5 (5.00" OD) Tooltip 2 Flange 1 3.25 AFT05X20G1R
ASA 1.5 (5.00" OD) Tooltip 2 Flange 3 3.25 AFT05X20G2R
ASA 1.5 (5.00" OD) Tooltip 2 Flanges 1 & 2 3.25 AFT05X20G3R
ASA 1.5 (5.00" OD) Tooltip 2 Flanges 1 & 3 3.25 AFT05X20G4R
ASA 1.5 (5.00" OD) Tooltip 2-1/2 Flange 1 3.25 AFT05X25G1R
ASA 1.5 (5.00" OD) Tooltip 2-1/2 Flange 3 3.25 AFT05X25G2R
ASA 1.5 (5.00" OD) Tooltip 2-1/2 Flanges 1 & 2 3.25 AFT05X25G3R
ASA 1.5 (5.00" OD) Tooltip 2-1/2 Flanges 1 & 3 3.25 AFT05X25G4R
ASA 2 (6.00" OD) Tooltip 3 Flange 1 3.5 AFT06X30G1R
ASA 2 (6.00" OD) Tooltip 3 Flange 3 3.5 AFT06X30G2R
ASA 2 (6.00" OD) Tooltip 3 Flanges 1 & 2 3.5 AFT06X30G3R
ASA 2 (6.00" OD) Tooltip 3 Flanges 1 & 3 3.5 AFT06X30G4R
ASA 3 (7.50" OD) Tooltip 4 Flange 1 5.12 AFT07X40G1R
ASA 3 (7.50" OD) Tooltip 4 Flange 3 5.12 AFT07X40G2R
ASA 3 (7.50" OD) Tooltip 4 Flanges 1 & 2 5.12 AFT07X40G3R
ASA 3 (7.50" OD) Tooltip 4 Flanges 1 & 3 5.12 AFT07X40G4R
ASA 4 (9.00" OD) Tooltip 4 Flange 1 5.12 AFT09X40G1R
ASA 4 (9.00" OD) Tooltip 4 Flange 3 5.12 AFT09X40G2R
ASA 4 (9.00" OD) Tooltip 4 Flanges 1 & 2 5.12 AFT09X40G3R
ASA 4 (9.00" OD) Tooltip 4 Flanges 1 & 3 5.12 AFT09X40G4R
ASA 4 (9.00" OD) Tooltip 6 Flange 1 5.25 AFT09X60G1R
ASA 4 (9.00" OD) Tooltip 6 Flange 3 5.25 AFT09X60G2R
ASA 4 (9.00" OD) Tooltip 6 Flanges 1 & 2 5.25 AFT09X60G3R
ASA 4 (9.00" OD) Tooltip 6 Flanges 1 & 3 5.25 AFT09X60G4R
ASA 6 (11.00" OD) Tooltip 6 Flange 1 6.44 AFT11X60G1R
ASA 6 (11.00" OD) Tooltip 6 Flange 3 6.44 AFT11X60G2R
ASA 6 (11.00" OD) Tooltip 6 Flanges 1 & 2 6.44 AFT11X60G3R
ASA 6 (11.00" OD) Tooltip 6 Flanges 1 & 3 6.44 AFT11X60G4R
ASA 6 (11.00" OD) Tooltip 8 Flange 1 7.38 AFT11X80G1R
ASA 6 (11.00" OD) Tooltip 8 Flange 3 7.38 AFT11X80G2R
ASA 6 (11.00" OD) Tooltip 8 Flanges 1 & 2 7.38 AFT11X80G3R
ASA 6 (11.00" OD) Tooltip 8 Flanges 1 & 3 7.38 AFT11X80G4R
ASA 8 (13.50" OD) Tooltip 10 Flange 1 9.88 AFT13X10G1R
ASA 8 (13.50" OD) Tooltip 10 Flange 3 9.88 AFT13X10G2R
ASA 8 (13.50" OD) Tooltip 10 Flanges 1 & 2 9.88 AFT13X10G3R
ASA 8 (13.50" OD) Tooltip 10 Flanges 1 & 3 9.88 AFT13X10G4R
ASA 8 (13.50" OD) Tooltip 8 Flange 1 7.75 AFT13X80G1R
ASA 8 (13.50" OD) Tooltip 8 Flange 3 7.75 AFT13X80G2R
ASA 8 (13.50" OD) Tooltip 8 Flanges 1 & 2 7.75 AFT13X80G3R
ASA 8 (13.50" OD) Tooltip 8 Flanges 1 & 3 7.75 AFT13X80G4R
ASA 10 (16.00" OD) Tooltip 10 Flange 1 9.88 AFT16X10G1R
ASA 10 (16.00" OD) Tooltip 10 Flange 3 9.88 AFT16X10G2R
ASA 10 (16.00" OD) Tooltip 10 Flanges 1 & 2 9.88 AFT16X10G3R
ASA 10 (16.00" OD) Tooltip 10 Flanges 1 & 3 9.88 AFT16X10G4R

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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