It is normally better to not have a check valve at a pressure tank that is connected to a submersible pump.
1. What is the advantage of having a check valve at the input to the pressure tank when using a submersible pump?False.
and less that a few dozen had an issue? Or are you saying that none of the systems that you installed had a related issue?I've installed 100's, maybe 1000's of tanks over the years with check valves on the tank with no issues what so ever.
Never had a water hammer issue with a check valve on the tank and one on the pump.
The only advantage I can see is that if the check valve on the pump fails, the entire system won't drain back through the pump and create a short cycle situation.
I think it would be interesting to track whether the water hammer is occurring with higher volume pumps. Around here, our typical installation uses either a 5 or 7 GPM pump, maybe that's why I'm not seeing water hammer issues on my installations.
It doesn't harm the system and that's what you want, we use them because if you use only one check in our area, you will have problems from broken drop pipe, check valve not holding, pump goes out early, so using multiple check valves will help with all those problems.
I wouldn't say it's luck. A check valve at the tank is pretty standard operating procedure around here, systems that have been in service for decades. Multiple check valve systems don't appear to have a shorter than average life expectancy.
Your one check valve has already been tested in my area and the problems went away from using 2 check valves in the well.
Broken drop pipe, check valves not holding, pumps failing early from the bad water hammer on pump shutoff at deep depths to water from the static water level dropping here.
This is awkward, but...
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