Structure and Working Principle
The aluminum-plastic pipe compression fitting male thread tee is a pipe fitting used for branch connection of aluminum-plastic pipes. Its core structure consists of three interfaces: two compression interfaces for connecting aluminum-plastic pipes, and one male thread interface for docking with valves or equipment with internal threads.
The compression interface presses the ferrule through the nut, making the cutting edge of the inner wall of the ferrule embed into the outer wall of the aluminum-plastic pipe, forming a double seal of mechanical interlock and rubber sealing ring to ensure a stable connection without air or water leakage. The male thread interface adopts a standard thread design, which can be matched with raw material tape or sealant to enhance sealing performance.
Specifications and Material Parameters
Size Matching
Compression Interface:
Applicable outer diameter of aluminum-plastic pipe: 16mm (1216), 20mm (1620), 25mm (2025)
Compression fitting specification marking: 1216 (suitable for 16mm outer diameter), 1620 (suitable for 20mm outer diameter), etc.
Male Thread Interface:
Thread standard: NPT (60° sealing taper thread) or BSPT (55° sealing taper thread)
Common sizes: 1/2" (DN15), 3/4" (DN20), 1" (DN25)
Material Parameters
All-Copper Material:
Composition: HPb58-2 brass is used
Surface treatment: Chrome plating or nickel plating, salt spray test ≥24 hours without rust
Performance Parameters
|
Parameter Category |
All-Copper (for gas/hot water) |
|
Working Pressure |
1.0MPa (10bar) |
|
Temperature Range |
-20℃ to 95℃ |
|
Burst Pressure |
≥4.0MPa (40bar) |
|
Sealing Test |
No leakage under 1.5 times working pressure for 30 minutes |
|
Vibration Resistance |
No leakage after 1-hour vibration test at 10-50Hz |
Installation Parameters
Pipe Cutting:
End face perpendicularity tolerance ≤0.5°, after removing burrs, it should be polished with sandpaper (80-120 mesh) to Ra≤3.2μm
Torque Parameters:
Tightening torque of compression nut: 25-30N・m for 16mm pipe diameter, 30-35N・m for 20mm pipe diameter. Use a torque wrench to tighten in 2 steps (initial tightening by 50%, final tightening to the standard value)
Pressure Test:
Gas scenario: 1.5 times the working pressure (e.g., if the design pressure is 0.4MPa, the test pressure is 0.6MPa), pressure drop ≤0.05MPa after 30 minutes of pressure holding
Hot water scenario: 1.2 times the working pressure (e.g., 1.0MPa for a test pressure of 1.2MPa), no leakage after 20 minutes of pressure holding
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