Accumulator Control Valve
This valve controls the hydraulic pressure to each accumulator according to the throttle pressure.
As the throttle pressure applied to (2) increases, the valve moves to the left to control the line pressure (1) and the hydraulic pressure (3) rises. Conversely, as the throttle pressure applied to (2) reduces, the valve moves to the right to control the line pressure (1) and hydraulic pressure (3) drops.