ADH4000-04: Float-Type Automatic Drain, the “Cleaning Guardian” for Compressed Air Systems

The ADH4000-04 is a heavy-duty automatic drain produced by SMC of Japan. Featuring a float-type design, it automatically discharges condensate from compressed air systems without requiring electrical power, effectively preventing air source contamination and equipment corrosion.Core Product Advantages

1. No Power Required, Energy-Efficient & Eco-Friendly Employs a float-type automatic drainage mechanism that operates without electricity and does not waste compressed air. Automatically discharges condensate based on the accumulated volume, making it energy-efficient and environmentally friendly.
2. Easy Maintenance Maintenance can be performed without disconnecting the piping, offering simple and convenient upkeep that significantly reduces maintenance costs and downtime.
3. High-Reliability Design The float-type design is known for its reliability and durability. It maintains efficient drainage performance even with contaminated water, ensuring a long service life.
4. High Drainage Capacity Maximum drainage capacity reaches 400 cc/min (at 0.7 MPa), meeting the demands of applications with high condensate generation.

Technical Parameters

• Port Size: Rc1/2 (1/2 inch)
• Port Thread Type: Female Thread
• Drain Type: Float-Type Automatic Drain
• Drain Valve Type: N.O. (Normally Open, opens when air pressure is absent)
• Proof Pressure: 2.5 MPa
• Maximum Operating Pressure: 1.6 MPa
• Operating Pressure Range: 0.05 to 1.6 MPa
• Medium: Compressed Air
• Ambient Temperature: 5 to 60 °C (unfrozen)
• Max. Drainage Capacity: 400 cc/min (at 0.7 MPa)
• Color: White
• Protection Rating: IP40
• Weight: Approx. 1 kg

Working PrincipleThe drain contains an internal air chamber (similar to a balloon). In the no-water state, air pressure pushes this chamber against the discharge outlet, sealing it. As condensate accumulates inside the drain and reaches a certain level, the buoyant force exceeds the air pressure, causing the air chamber to float up and open the discharge port. The condensate is then expelled by the air pressure. As the water level drops, buoyancy decreases, the air chamber descends, and reseals the discharge port, completing one drainage cycle.Typical Application Scenarios

• Bottom of Air Receivers (Storage Tanks):​ Periodically removes condensate to prevent corrosion and contamination, extending the receiver’s service life.
• Downstream of Filters & Dryers:​ Timely discharges separated oil/water mixtures, maintaining air quality and ensuring proper operation of downstream equipment.
• Air Treatment Units (FRL):​ Integrated as a drainage component after filter-regulator-lubricator units, providing clean, dry air for pneumatic systems.
• Piping in Low-Temperature Environments:​ Prevents condensate from freezing and blocking pipes, ensuring stable system operation in cold conditions.

Installation & Usage Precautions

• Installation Requirements:​ The drain should be installed with the discharge port oriented vertically downward, with a deviation of less than 5 degrees from the vertical line. Leave at least 200mm of free space above the unit for maintenance access.
• Piping Requirements:​ Use piping of 1/2B or larger for the drain outlet. The inner diameter of the drain pipe should be at least 8mm, and its length should not exceed 10 meters. Avoid vertically upward piping runs and sharp bends.
• Pressure Requirements:​ Air pressure must not exceed 1.6 MPa and should be above 0.05 MPa. The air compressor’s output flow should exceed 50 L/min (ANR).
• Temperature Requirements:​ The temperature of the compressed air and the ambient temperature at the installation site should be within the 5 to 60 °C range. Operation outside this range may cause malfunctions.
• Regular Maintenance:​ Check the drainage operation at least once daily. Regularly press the flush button to open the exhaust valve, ensuring the drain functions correctly.

ConclusionThe ADH4000-04 Float-Type Automatic Drain is the “Cleaning Guardian” for compressed air systems. It perfectly combines power-free operation, automatic drainage, and easy maintenance, providing an efficient, reliable, and energy-saving solution for condensate removal in industrial automation systems.Choosing the ADH4000-04 means opting for an intelligent and reliable air source maintenance solution, offering continuous protection for your clean pneumatic system!