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Author Topic: Check valves  (Read 700 times)

Txmale361

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Check valves
« on: December 14, 2017, 09:24:17 PM »
Hello,

Dumb questions here but Iím fixing an RV my dad had but passed, and due to hurricane Harvey Iím forced to fix up. Long story.

Iím working on the plumbing and had a case where water was coming out of the city water inlet and I read it might be a defective check valve. When I removed this it didnít appear to be a check valve, or this valve had broke. Also there was no check valve coming from the water pump which I read there should also be one. So my question is how many check valves are needed. This is my list as I have seen

* from water pump outlet
* from city water outlet
* from hot water outlet

Question is should there also be one for the water heater cold water inlet also. I promise my questions will be more intelligent in the future 👍

Rene T

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Re: Check valves
« Reply #1 on: December 15, 2017, 07:07:17 AM »
First, welcome to the forum.
There is a check valve where your water hose would hook up to. If you remove the hose look at the fitting and you should see a screen. Remove it and then look in the hole and what you'll be looking at is the check valve. The only time this would leak is when the water pump is on. While the pump is on, take a pencil with a eraser on it and push in on what you see. Water will rush out but it may clean the check valve.
 
Typically there is no check valve at the water inlet (bottom pipe). It's rare, but some do.

There is a check valve at the water heater outlet if you have a 1 or 2 valve bypass system. If you have 3 valves for bypassing the water heater, there will not be a check valve.

The water pump does have a check valve which prevents water from going to the water tank when you're hooked up to shore power.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Gary RV_Wizard

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Re: Check valves
« Reply #2 on: December 15, 2017, 10:53:18 AM »
The check valve in the city inlet is usually part of the inlet itself. If it fails you can add a separate check valve immediately behind the inlet, but its usually just as cheap & easy to replace the inlet.  The water pump check valve is internal as well, but you can add one on the pump inlet side if needed.

Rene gave a solid explanation, so I won't add any more.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Txmale361

  • Posts: 3
Re: Check valves
« Reply #3 on: December 15, 2017, 09:07:02 PM »
Thank you so much Rene and Gary 🙏. I have the water working and it is thanks to yíall. Yíall were a lifesaver!

Rene T

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Re: Check valves
« Reply #4 on: December 15, 2017, 09:11:34 PM »
Thank you so much Rene and Gary 🙏. I have the water working and it is thanks to yíall. Yíall were a lifesaver!

What did you do to fix it?
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Txmale361

  • Posts: 3
Re: Check valves
« Reply #5 on: December 15, 2017, 09:21:00 PM »
Water pump didnít have a check valve. I replaced other lines with Sharkbite connections as well.

Gary RV_Wizard

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Re: Check valves
« Reply #6 on: December 16, 2017, 09:16:23 AM »
Lack of a check valve at the water pump would let water in the lines drain back into the tank. If on city water, it fills the tank till it overflows. If using the pump, the pump never fully shuts off because it cannot maintain water pressure.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

NY_Dutch

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Re: Check valves
« Reply #7 on: December 16, 2017, 09:49:25 AM »
Water pump didnít have a check valve. I replaced other lines with Sharkbite connections as well.

The water pump check valve is an internal part of the pump. It is not a separate item.
Dutch
2001 GBM Landau 34' Class A
F53 Chassis, Triton V10, TST TPMS
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox base plate

Gary RV_Wizard

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Re: Check valves
« Reply #8 on: December 16, 2017, 06:09:37 PM »
Yeap, already advised him of that. Apparently he needed to add one, so I'm guessing it was not working properly.

Quote
The water pump check valve is internal as well, but you can add one on the pump inlet side if needed.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

NY_Dutch

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  • Following the warm weather!
Re: Check valves
« Reply #9 on: December 16, 2017, 07:25:46 PM »
Yeap, already advised him of that. Apparently he needed to add one, so I'm guessing it was not working properly.

Yes, and I reiterated the point when he posted that the pump didn't have one. I just wanted to make sure he understood how the setup is supposed to work.
Dutch
2001 GBM Landau 34' Class A
F53 Chassis, Triton V10, TST TPMS
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox base plate