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. The trigger on the gun and unloader valve together make up a two-part valve that directs water into the bypass of the unloader and then back in to the water inlet side of the pump or alternatively back to a header tank. The unloader valve can also be used for adjusting the pressure of your machine. The Unloader valve is designed to respond to an increase in pressure or a change in water flow.
A pressure washer unloader valve diverts the water flow through the bypass when the trigger on the gun is depressed.
