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Need to lower 1750 psi to 300 psi on my portable power washer.

\015 In a pinch and waiting on my new Cat truck mount water pump to arrive. I have a newer Husky 1750 psi portable power washer. Is there a way to regulate pressure coming out of the pump via a cheap 'dump' valve? Instead of using a garden hose into the power washer I am going to feed it's water inlet from my trucks water tank . How much pressure is needed going into these portable power washers to make them operate ( my trucks water tank is about 20 gallons with the gravity of the water pushing out the water through a garden hose size valve)? At any rate, I need about 300 psi MAXIMUM and it will be divided across 4 jets on my wand. So really I could probably suffice with 500 psi. I could make an easy regulator by just feeding off the line back into my water holding tank by way of a tee and a hose, but then I think the pump will run continuously since the power washer depends on this back pressure from shutting off the sprayer to trigger the pressure switch on the motor. Thanks for any help.\015

Answers :

Don't starve the inlet to the pump. It will detroy it.
\015\012Buy a pressure regulating valve and plumb it in line per the instructions. Do not use a relief valve because you will have to have a return line or you will heat the water up on the inlet side of the pump depending on how the pressure washer is set up. It should already have a safety relief valve. You might look and also find a pressure regulator that is adjustable and all you problems will be solved.
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