Flow-actuated unloaders divert water to bypass when there is a sufficient drop or stoppage of water flow into the unloader. Trapped pressure unloaders are opened by the increase in pressure when the trigger is released on the gun. 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.
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