| 1. Pressure on the unloader line forces the piston (green) past the drain port, sealing the water collection reservoir from the atmosphere.
2. As the piston moves forward, being forced by the pilot signal air (red), the stainless steel ball check (purple) is opened, permitting condensation and oil (light blue) to be forced up into the stainless steel reservoir.
3. This compresses the air in the top of the reservoir to system pressure.
4. As the pilot signal valve returns to zero, the piston returns, closing the system from the atmosphere.
5. When the piston returns to the original position, the drain port is opened, allowing the accumulated condensate and oil to be expelled. |
