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Tool Talk Discussion Forum

Pressure washer by-pass

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Don L C

02-04-2006 18:24:17




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I need to be able to keep the motor running on my pressure washer....could I pipe in a by-pass back to the inlet side, using say 3/4"pipe scedual 40 or 80 and stainless ball valves ? That way the high pressure would be off the pump yet enough water to keep it cool.....I would expect to run in the by-pas for no longer than 5 min....

My unit is a 2400 lb. Star with Honda engine...
how about slowing down during by- pass....

thanks Don SW Ohio

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Bob

02-05-2006 10:45:19




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
Unloader valves snap open, and bypass the pressure, until the wand is "triggered" again.

They are better than a simple relief valve, 'cause the pressure drops WAY down in bypass mode, so the pump doesn't heat up as quickly, and when you "trigger" the wand, they snap closed, allowing full pressure, again.

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CNESLER

02-05-2006 10:28:35




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
I put a 1/4 inch pipe tee and ball valve at the wand and open the valve to release pressure which makes it easy to start and does not over pressure the pump.
Good Luck
CNESLER



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Don L C

02-05-2006 08:19:26




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
I for got to mention ,I have ARTHER in my joints and sholders....I though the large by-pass would alow me to pull the start rope..... .Don SW Ohio



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Princeton Bill

02-05-2006 14:48:27




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 Re: Pressure washer by-pass in reply to Don L C, 02-05-2006 08:19:26  
If you need to take the pressure off while starting the engine just pull and hold the trigger on the wand and the engine will turn over easier. I have a 3400 lb one with a 10.5 hp motor and I do that all the time. Of course when it starts you want to have a pretty good grip on the handle:>)!



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DRL

02-05-2006 07:55:08




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
Might look at operators manual again. When I went looking for a pressure washer, most had a temp sensitive valve that allowed you to keep washer running when not spraying. When the water in the pump reached a certain temp, the valve opened up and allowed water to flow through pump until the temp came back down. FWIW



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Leland

02-05-2006 07:35:22




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
As long as water does not boil you should be all right , but what model is this unit it should have a factory one installed



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JD9295

02-04-2006 22:06:30




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
do it with a PRV (pressure relief valve), get an adjustable one and play with it until you get it set where it opens where you want and you wont have to worry about it



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Charles (in GA)

02-04-2006 20:25:57




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 Re: Pressure washer by-pass in reply to Don L C, 02-04-2006 18:24:17  
My Karcher 2500 psi model allows you to run the unit for 5 minutes without opening the valve on the hand wand, this is to allow you to stop and lay the wand down and do something, such as move or reposition whatever you might be cleaning and pick the wand back up again, and continue spraying.

Charles



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oldrustycars

02-04-2006 20:40:09




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 Re: Pressure washer by-pass in reply to Charles (in GA), 02-04-2006 20:25:57  
ive never seen a pressure waher that didnt have a bypass. im sure you can get one from grainger, and look at pressure washer to see how to plumb it.



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