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paulz
Member
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# Posted: 25 Jul 2022 04:06pm
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I bought a 'high flow' garden hose Y with ball valves. I expected the valves to have garden hose size holes, 5/8 or 3/4, but they are only maybe 3/8 or 7/16. So I tested it, filling a 5 gallon bucket in 45 seconds from my well pump, with and without the Y. I expected the small holes to slow it down, why doesn't it?
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gcrank1
Member
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# Posted: 25 Jul 2022 04:20pm - Edited by: gcrank1
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The small holes increase the outlet pressure, they dont reduce the volume being delivered.
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paulz
Member
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# Posted: 25 Jul 2022 04:54pm
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They may be true to a point, what if the hole was 1/8", not going to fill a 5 gallon bucket in 45 seconds that way.
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gcrank1
Member
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# Posted: 25 Jul 2022 05:06pm
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Or it would be a snotty pressure washer or even a metal-cutting water jet?
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Irrigation Guy
Member
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# Posted: 25 Jul 2022 05:40pm - Edited by: Irrigation Guy
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The small hole doesn’t make more pressure (pumps and elevation make pressure) it increases the velocity, it will also cause pressure loss through friction but in such a small fitting it is negligible. If you choked it down to 3/8 for 50’-100’ you would see lots of pressure loss
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gcrank1
Member
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# Posted: 25 Jul 2022 07:37pm
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Ah, yes, thats what I was thinking but couldnt say right....
Good thing we have pro's around here 
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spencerin
Member
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# Posted: 26 Jul 2022 01:30am
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Fluid dynamics is like Greek to me.....
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gcrank1
Member
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# Posted: 26 Jul 2022 09:55am
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Im pretty good with the 'water goes downhill' part....
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paulz
Member
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# Posted: 26 Jul 2022 10:08am
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Yeah same here. To make matters worse, I use the water analogy for volts/amps/ohms understanding!
That's why I have to do real time testing as above. I also know that replacing the 400' of garden hose with 1" poly pipe makes filling my water tank much faster.
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