How does an unloader work on a pressure washer?

A pressure washer unloader valve diverts the water flow through the bypass when the trigger on the gun is depressed. The trigger shuts off the water flow, causing the unloader valve to re-circulate the water back to the header tank or alternatively back to the inlet side of the pump.Click to see full answer. Accordingly, what is the unloader on a pressure washer?Pressure Washer Unloader / Regulator Valves. An unloader valve is the component of a pressure washer that allows the pump to bypass the flow of water back to the pump while the spray gun is not being used. Most unloader valves also act as a pressure regulator for the output pressure of the pump.Secondly, what is an unloader? The unloader diverts the flow of water from the outlet side of the pump back to the inlet side, causing water to flow in a loop back to the pump under virtually no pressure rather than to the nozzle under operating pressure. Flow may be directed back to the pump inlet or to a float tank or other type of reservoir. Accordingly, how do you adjust the unloader valve on a pressure washer? When adjusting the valve, the motor should be running, but make sure it is set at the appropriate rpm (usually 3700 before a load and 3400 under a load). Now, remove the nylon insert lock from the unloader valve then shut off the pressure adjusting knob. Why does my pressure washer dies when I pull the trigger?Pressure Washer Shuts off when Trigger Released (SOLVED) If your pressure washer shuts off when the trigger is released, it has a problem with the unloader valve. There are a few issues with your unloading valve that causing stalling the engine pump.