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Unloader
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Definition:
A device used to relieve the water pressure within the pump whenever spray flow is blocked. It allows the engine or motor to continue running even when the operator lets go of the trigger on the spray gun and stops washing. It diverts the pressure that would build up without the unloader by taking the water from the pump’s exit side and looping it back to the inlet side in a continuous “bypass” mode. The unloader also returns the flow of water to the gun when the operator is ready to clean again.
