SMC VEX3900-20-X2 is a hand-operated power valve in SMC’s VEX series, designed for manual control of compressed-air flow in pneumatic circuits. The model is a three-position hand valve (VEX3900-20-X2) that lets operators select airflow paths to drive or hold a pneumatic actuator. This compact hand valve is part of the VEX family and is used to manually actuate air circuits in automated equipment and tooling where direct operator control is required.
