Primary secondary piping, valve placement


Old 11-19-08, 06:04 AM
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Primary secondary piping, valve placement

I am piping a primary secondary system similar to drawing #4 with at least 2 boilers.
My question is where would the best place be for isolation valves between the primary and secondary loop?

I will be installing valves on both return and supply of each boiler.

I have seen on designs in 2 different locations, one being after the tees and before the boilers and I have seen them placed before and after the tees.
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Old 11-19-08, 05:50 PM
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Keep them close to the tees on the secondary connections, not close to the boilers. Also have a purge valve near one of the valves on each boiler.
I would follow the manufacturers recommendations for the boiler being used. If they do not address it contact and they can clarify.
Also see the first drawing here as it is the best way to pipe multiple boilers
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