ADJUS UNLOADER VALVE

The function of unloader valve.Fix an unloader valve like the chart below and set it for constant pressure.When the high pressure nozzle is opened, it becomes the?direction.when the high pressure nozzle is closed, the pressure rises. and when it becomes higher than fixed pressure, the unloader valve start working. The flow changes in the direction of?, and water/solution return to a tank through overflow hose.As for the pump, it runs under low pressure operation.