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Gate valve installation in wet return; best placement
I am getting ready to install a gate valve in my wet return to help clean out my old wet return, and the oil and crud that I anticipate from my newly repiped installation to 3 previously disconnected radiators on a one pipe system. I have a drop down header with 3 take-offs that equalizes to the wet return via the HL before re-entering the boiler. The 1st take off is a parallel flow the ends at the wet return on the opposite side of the house and meanders the basement wall back to the boiler. The 2nd talk off is a counter flow that feeds 2 radiators (a 1st & 2nd floor). The 3rd take off is also a counter flow that feeds a single radiator on the 2nd floor, and 2 1st floor, CIBB radiators (2 pipe; air vented) which I just finished tying in. If I place the new valve on the vertical, returning side of the HL, the 1st main will drain back through the wet, but 2 & 3 will counter flow back through the equalizer and end up in the boiler (that kinda defeats the purpose). But I could also place it on the boiler side of the HL, that will stop the counter flow from mains 2 & 3, and divert the crud back into the wet return so it can also be flushed. The main difference I see, is that the equalizer is now open to the wet return. I'm not sure if that would inhibit the cleaning process especially if I open at some high pressure, or cause something else.