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What causes a pulsation in the pump?

causes pulsation pump
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What causes a pulsation in the pump?

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The unloader valve in the pump opening and closing very rapidly causes the pulsation that is sometimes felt when using a pressure washer. Any restriction down stream from the pump can cause the unloader to go into a bypass mode. When it is pulsating, the restriction is only slight enough to put the unloader into bypass for a short moment, then back to high pressure in a rapid succession. This produces the pulsation felt when using the pressure washer.

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