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 Check Valve Sizing
Author: Luckey (IN)

Running an open loop geothermal heat pump with 3/4 pvc pipe for inlet and discharge. I'd like to put an inline check valve in the discharge line so that the line will retain water, hoping to resolve water hammer issue. I'm running a flow rate of 6-9 gpm through the heat pump. Is there a check valve that will allow this (6-9 gpm) flow rate and close when the rate drops below a certain point (heat pump shuts off) to allow water to be retained in the discharge line?

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 Re: Check Valve Sizing
Author: packy (MA)

when i use a check valve for hydronic heating, i use the 'stadler' brand spring check made specifically for that situation. the spring is not killer strong so a heating system circulator will open it when needed.
some spring checks are designed to hold back water pressure so the spring is stronger.
i know yours is not heating system but it is the same principle.

i don't know about GPM but a 1 inch valve with reducers in it to 3/4 ought to give you plenty of flow..

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 Re: Check Valve Sizing
Author: Luckey (IN)

Thanks. Its a simple solution and hopefully it solves the water hammer.

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