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Old 09-19-2020, 05:00 PM   #1
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Brand: Thor Motor Coach
Model: Ace 27.7
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Water pressure

I have a water pressure regulator set at 50 but don't get much pressure in the shower. I am afraid that if I turn it up more that I could blow a line, Or do I just have to purchase a new shower head.
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Old 09-19-2020, 05:14 PM   #2
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Start with removing the shower head and checking the head, and flow restrictor

Also make sure the shower valve, or valves are flowing freely, often the cartridge can be full of shavings or debris

What is the actual pressure at the bib, it could be less than 50 psig

Most pressure regulators restrict flow somewhat, especially the simple straight non adjustable type
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Old 09-19-2020, 06:16 PM   #3
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Originally Posted by Mwiemer View Post
I have a water pressure regulator set at 50 but don't get much pressure in the shower. I am afraid that if I turn it up more that I could blow a line, Or do I just have to purchase a new shower head.
There should be a filter screen at the hose adapter on the coach and a filter on the pump's input side if you using your coach's water pump, that can clog. You biggest restriction is in the shower connections. There should be a 1.5 gallon per minute restricter installed. It can usually be removed by unscrewing the shower's flex line from the faucet assembly and prying out the plastic restriction.
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Old 09-20-2020, 04:20 AM   #4
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This shower pressure thing is beginning to bother me. I have removed all of the restrictor discs and I have changed the showerhead. I have even gone to the extent of drilling out the port or the water discharges from the shower mixing valve trying to increase the flow. I have even gone to the extent of drilling out the port of the water discharges from the shower mixing valve to increase the flow. I’m still getting what I like to describe as” A dribble“ out of the shower head. It is marginally adequate to take a shower. With the city water flow selector switch set up and the regulator set between 52 and 53 psi, it is similar to when I use the ShurFlo water pump, and it has a cut off at 55 psi. My next step I suppose, is to set up a PSA gauge on the end of the shower hose to see what pressure I am actually getting there. I should probably also measure the flow of water that the pump is putting out. The pump label says three GPM, and I would suggest that that amount is unlikely based on what I’m seeing at the showerhead. Am I being too anal about this, or should I just go get a hotel room?
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Old 09-20-2020, 12:25 PM   #5
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Have you tried filling your freshwater tank, and using your water pump?
This may be more of a problem with your supply: not your RV.
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Old 09-20-2020, 01:40 PM   #6
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Originally Posted by Gebills View Post
This shower pressure thing is beginning to bother me. I have removed all of the restrictor discs and I have changed the showerhead. I have even gone to the extent of drilling out the port or the water discharges from the shower mixing valve trying to increase the flow. I have even gone to the extent of drilling out the port of the water discharges from the shower mixing valve to increase the flow. Iím still getting what I like to describe asĒ A dribbleď out of the shower head. It is marginally adequate to take a shower. With the city water flow selector switch set up and the regulator set between 52 and 53 psi, it is similar to when I use the ShurFlo water pump, and it has a cut off at 55 psi. My next step I suppose, is to set up a PSA gauge on the end of the shower hose to see what pressure I am actually getting there. I should probably also measure the flow of water that the pump is putting out. The pump label says three GPM, and I would suggest that that amount is unlikely based on what Iím seeing at the showerhead. Am I being too anal about this, or should I just go get a hotel room?
Measuring your water pressure at the shower hose will be a waste of time, it will be the same as the pump output or the city water with no flow. (Ask Pascal).

Get a 2 quart picture.
Get your stopwatch app ready on your smart phone.
Go to the kitchen sink and measure the time it takes to fill the picture.
Remove the shower head and do the same thing from the shower hose.
Now do you have a shower flow problem? Or is it the same as the kitchen sink?

No difference? Put the shower head back on and measure again.
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Old 09-20-2020, 02:09 PM   #7
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While you're at it: perform the same measurement for your water supply source...
Good luck!
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