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October 31, 2019


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Cackety D

I have a pressure washer with a pump that enters "bypass mode" (water recirculates in a closed loop within the pump) when the engine is on and the trigger is not depressed.

If the recirculating water and the pump get too hot, a relief valve opens and the water spurts out, and fresh, cooler water flows in.

The operator is supposed to pull the trigger, relieving pressure, every two minutes at least. If that will not be possible, she is supposed to shut the engine down.

A sticker on the chassis reads: "Warning. Do not rely on the relief valve to preserve the system. It is designed for use only rarely as a fail-safe."

Will Audrey be a reliable operator of a system like this?

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