An unloader is a mechanism design to release the pressure in the compressor pump when it reaches a certain level. This is typically done to reduce the starting load on the electric motor when the compressor starts up. There are different types of unloaders, but the general purpose is to prevent the compressor from starting against a high-pressure head. The unloader serves the purpose of controlling pressure, whether it’s in an air compressor to reduce startup load or in a pressure washer to regulate pressure during operation.
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