Graco 220168 Air Valve Piston

The Graco 220168 Air Valve Piston shifts position inside the chamber to open and block pressurized ventilation pathways for controlled actuation. A cylindrical bore guides its travel while metal seating surfaces restrict lateral movement as pressure builds and releases across internal compartments. Movement against opposing force alters airflow direction, producing alternating delivery states without relying on continuous passage through a fixed channel. Internal sealing contact areas maintain controlled separation between pressure zones, allowing precise modulation of intake and exhaust timing while the surrounding valve structure stabilizes alignment during repeated directional transitions and pneumatic response shifts.