What size valve do I need to protect a water line from freezing?

The size and number of valves needed for your application is determined by the flow required to prevent freezing. Once you know the required flow rate and your water pressure, you can calculate the required valve flow coefficient, Cv.

Any valve or combination of valves with a total Cv greater than or equal to this will provide adequate protection. Refer to our Application Profile #3 for calculation.

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