Line pressure from between the pressure regulator and manual valve circulates around the pressure regulator valve. After flowing through a restriction to the seat number 8 check ball, line pressure enters the throttle valve, which produces line-to-throttle pressure. With the throttle valve open, throttle pressure charges the kickdown valve and strokes the throttle plug to its extreme left position at the pressure regulator valve. Line pressure from the manual valve does not flow to the pressure regulator valve to oppose spring tension. The pressure regulator valve coil spring pushes the pressure regulator valve over to close the exhaust port. Line pressure builds to approximately 200 to 300 psi (1,380 to 2,070 kPa).