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MNLD Mechanical No Loss Float Drains, Alpha-Pure MNLD drains collects liquid inside the unit through the inlet, gradually causing the ball float to rise. Upon reaching a predetermined height, the ball float opens the pilot valve. This relieves the pressure chamber above the diaphragm. As a result, the pressure of the condensate lifts the diaphragm, allowing the collected condensate to be discharged. As the condensate is discharged, the float sinks, closing the pilot valve. Compressed air then flows over the diaphragm, sealing it again.