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Old 08-15-2014, 04:04 PM   #15
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No EMI Bypass Valve #1 diverts the cold water from the water heater inlet to the bypass line.. IT DOES NOT prevent water (or pink stuff) from back-flowing into the heater tank.. THAT is the check valve's job.

I have a 3-valve system.. Thus I do not have a check valve and all the problems it causes.
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Old 08-16-2014, 02:22 AM   #16
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In my case, the check valves do make a bit of a squealing noise when hot water is flowing, has been that way for two years. As I said earlier, the first set of valves did the same thing, dealer replaced them, quiet for 1 year, then noise again. This time I did not replace them. Although I fulltime, and never winterize, I do drain the tank annually, the squealing noise doesn't change.

In my case, the check valves are only for the normal flow of water to and from the hot water tank. There is a manual by-pass valve on the back of the tank plumbing that will isolate the tank from the water system during winterizing. The only reason for the by-pass is to keep the 'pink' stuff from filling the tank, and wasting 10 gallons of anti-freeze.

In my case, the only other check-valve in the system seems to be on the water line that runs to the sprayer in the black tank, used for cleaning. It makes noise too.

And, in my experience, I have walked by several RV's over the last few years, and noticed a squealing sound coming from the area of their hot water tanks. Seems like a common problem from a bad check valve design.

For me, the hot water continues to flow, I can put up with the noise. When it stops, I will replace them.
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Old 08-16-2014, 05:05 AM   #17
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In my case, I have a 3 - valve system and no check valves (related to the hot water heater). For me, no issues. Here's another opinion:
The RV Doctor: RV Water Heater Check Valve - What For?
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Old 08-16-2014, 06:44 AM   #18
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Well I think I'm going to wait for the flow to stop. The first malfunction when the mh was a year old, HW shut off, tech replaced, I watched. # 2 we noticed squealing before HW water flow stopped . Changed #3 when it started squealing. Now # 3 is squealing, so maybe I'm being to quick to condem. I ordered a new valve and will hope it stays in my" in case I need it drawer" !
Thanks again for all the info.
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Old 08-16-2014, 07:45 AM   #19
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Stearn, how's the water in your area? I'm wondering if maybe you have an extra dose of minerals that might be clogging up your check valves faster than normal. Just a thought. Do you use a water filter on your input hose? Might be worth a try.
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Old 08-16-2014, 09:19 AM   #20
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Journey the outlet check valve is to prevent back flow of the pink stuff into the tank, there is no other reason for it.

As for inlet check valves on some water heaters.. I can see no reason for those at all save that in a few cases hot water can back up into a cold line without them, but a couple feet of pipe fixes that without the problems.
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Old 08-16-2014, 10:12 AM   #21
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Quote:
Originally Posted by emiddleb View Post
Stearn, how's the water in your area? I'm wondering if maybe you have an extra dose of minerals that might be clogging up your check valves faster than normal. Just a thought. Do you use a water filter on your input hose? Might be worth a try.
We have city water that comes from Toledo. We were in the UP when the water scare happened, "and noticed the squealing". We are still not drinking the water even tho they say it's safe. I have a filter that I use before water enters the coach. Yes I still have to clean the screens at the faucet occasionally. We have spent our winters in Fla, Az and Tx, While wintering I change my filter every two months. Just looked at the last valve I replaced and it doesn't seem to have much mineral build up. Like I said I'm going to wait till the water flow stops before changing. Maybe I was being to quick to condemn .
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