Another valve option is a swimming pool solar heater valve. Search for Jandy or Pentair, they are expensive new but you might be able to find them on e-bay. They are typically used with 3 way valves but you can either use a on/off ball valve or just cap the third port if you find a used 3 way. Part number is JVA-1240. The JVA2440 is the 24volt version the motors are interchangeable but expensive.
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