Ross Controls 2172B8903 Solenoid Pilot Controlled 2-Way 2-Position Valve

Ross Controls 2172B8903 is a solenoid-pilot controlled 2‑way, 2‑position valve in the 21 Series, engineered for compact pneumatic control in industrial automation. The 21 Series is a family of high/low temperature directional valves designed to perform reliably in demanding environments, with model codes that define actuation, port size, and voltage. Within this lineage, the suffixes indicate coil voltage options (for example, W denotes 24 VDC, H denotes 12 VDC, Z 110–120 VAC, Y 230 VAC), and the 2/2 configuration is a two-port, two-position valve that uses a solenoid pilot to shift between states. Exact port size and configuration for 2172B8903 are specified by the full model code in Ross catalogs, as 21 Series variants span multiple body/port sizes. Common applications include actuating small pneumatic cylinders or pilot lines in OEM machinery, automation stations, and other compact control circuits where electrical signals control a pneumatic path. The model number structure and documented examples in the 21 Series catalogs illustrate how 2172B components fit into the broader family of solenoid‑pilot 2/2 valves, enabling precise, repeatable air control across a range of temperatures and voltages.