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AAD/AAH Series Automatic Drain Valve for Compressed Air
Product Advantages
Why Choose the AAD/AAH Series?
Are you still troubled by manually draining condensate? Or experiencing production efficiency impacted by drain malfunctions? The AAD/AAH series terminal drain is the ultimate solution for your air source treatment components. Through its intelligent mechanical structure, it accurately senses the amount of condensate, achieving fully automatic and highly efficient drainage, completely freeing you from tedious maintenance work. Whether installed after an air tank, filter, or dryer, it ensures your pneumatic system always maintains optimal performance, effectively extending equipment life and improving overall production efficiency.
Technical Parameters
| Model | Connection caliber (G)Rc | Drainage outlet diameter (G)Rc | Operating pressure range (MPa) | Options/Instructions | |
| AAD402 | 4 | 1/2" | 3/8" | 0.15~0.85 | Ambient and fluid temperature: -5~60℃ (non-freezing). Automatic drainage, no manual operation required. Maximum operating pressure: 1.0Mpa (10.2kgf/cm²) |
| AAH402 | 4 | 1/2" | 3/8" | ||
| "Note: 1. When installing the drain pipe, use a pipe with an inner diameter of φ10 mm or more, and the length should not exceed 5 meters. Do not bend the pipe upwards. 2. The compressor power must be greater than 3.7 kW, and the flow rate (ANR) must be above 400 L/min." |
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Construction diagram
1. When the cup is pressureless:
The float (5) descends due to its own weight, the valve (9) closes the cavity, the piston (8) is pressed down by the spring (11), and the condensate drains through (12).
2. When the cup is pressurized:
When the pressure is above 1 kgf/cm², the piston (8) overcomes the spring (11) and presses upward, thus closing the drain channel (12) and isolating the inside of the cup (10) from the outside.
3. When the cup contains condensate:
When the condensate accumulates to a certain level, the float (5) rises due to buoyancy, opening the inner cavity (6), allowing pressure to enter the inner cavity. The piston (8) is pressed down by the pressure and the spring (11), and the condensate drains through the drain pipe (13).Symol
Overall Dimension
Main components
| Part Number | Name | Standard |
| 1 | Top Cover | Die-cast aluminum |
FAQ
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Q: How does the drain valve work?
A: Taking the AAD series as an example:
①Collection stage: Condensate enters the drain valve, and the float sinks to the bottom due to its own weight, closing the drain outlet.
②Triggering stage: As the water level rises, the float rises accordingly.
③Draining stage: The float triggers the internal piston or valve mechanism, and under system pressure, the drain outlet opens, initiating efficient drainage.
④Closing stage: After the water level drops, the float falls back down, closing the drain outlet again, completing one cycle.
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Q: Why does a large amount of air spray out when draining? Is this normal?
A: At the moment the drain valve opens, some compressed air will be expelled along with the condensate. This is normal and helps to "blow" the condensate out. However, if the spraying time is too long or the air volume is too large, it may mean that the drain valve is not closing tightly or is internally damaged, and it needs to be checked.