Winterizing Question: Is My HWT Check Valve Leaking?

Question

This pic is the HWT bypass set-up of my present TT. It only has one bypass valve & a check valve at the hot water outlet. Since last season, I started to blow the system clear of water before pumping anti-freeze in. After draining the HWT (with some residual water remains), compressor set at 40 psi and HWT inlet on bypass, I can hear water sloshing inside the tank. Theoretically, there shouldn't be air blowing in the tank. Do I have a leaky check valve?

boon_docker · Answer

I would say yes you have a defective check valve.

midnightsadie · Answer

or your blowing way to much pressure and opening it up.

old-biscuit · Answer

Remove drain plug and see if you get water/air mixture blowing out

tkw · Answer

Thanks for the replies! I will go over the process again this weekend and check out the HWT drain.  I actually did something stupid yesterday while pumping the pink stuff through. I forgot to shut off the outside shower faucet after blowing compress air through and went ahead pumping pink stuff. Before I knew what hit me, 2 jugs of them gone to the ground while I was inside the TT. I managed to use a spare jug to finish off all the other fixtures but it sure feels like there's some unfinished business.

travisc · Answer

I’ve had both the fresh water city check valve fail and the hoywater check valve fail-   Took me two gallons to figure out I was filling up the hot water holding tank after I shut the by-pass off.   The city water was kind of funny- I’d try to pressure up the system with the water pump and it would shoot out the side of the rv.  Same trip the black water valve wouldn’t close.........

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Winterizing Question: Is My HWT Check Valve Leaking?

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