When Air leaving the exhaust port of a four way valve is directed to?

When air leaving the exhaust port of a four-way valve is directed to the atmosphere, it means that the valve is in the exhaust position. In this position, the compressed air that was previously supplied to the cylinder is released to the atmosphere, causing the piston to retract. This exhaust position is often used at the end of a pneumatic cycle to return the piston to its original position or to prepare the valve for its next operation.