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Flow Check Valve: yes/no?
I have not installed a new system is a few years .... looking and reading many threads -- don't see any flow check valves? The Cast iron Type. I was always told the circulators did not restrict fantom flow. What's up?
It also seems that purchasing the circulators with internal flow checks is the norm .. I'm not seeing how they are necessary -- and they don't stop unwanted flow?
What am I missing?
I would think the check valve in the circulator must cause some restriction.