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« Last post by Cary Austin on July 22, 2023, 12:10:40 PM »
You can certainly do that. Placing the CSV1A at the pressure tank will let you set it for 78 when using a shower, and the irrigation teed in prior to the CSV will still work as normal at 65 PSI. You actually want the CSV set at 78 when using a large tank and a 60/80 switch. However, when the irrigation is not running, the back pressure from the CSV will be on the lines prior to the CSV, including the irrigation lines to the solenoid valves. The back pressure will be as much, but also no more than your pump can produce. You may want to figure the backpressure of your pump because of this. Horsepower, GPM series, and depth to water is all you need to figure back pressure. I can help if you feed me the numbers, or I can help you figure out those numbers.
In your second scenario of placing the CSV at the well, here is what happens. Since you have already matched all your irrigation zones to the output of the pump at 65 PSI, installing the CSV1A prior to the tee to the irrigation will cause a 10 PSI loss at 20 GPM flow. When everyone of someone's irrigation zones are small and cause the pump to cycle on and off, the friction loss of the CSV1A is a moot point. They will never see a loss of pressure. But if one of there zones is already maxing out the pump the way yours does, they see a 5-10 PSI loss on that zone.
A third option is to install the CSV125 or CSVS125 in the well or at the well head. These valves have so little friction loss that zones matched to the pump will only see a pound or two loss. However, they are not adjustable and the highest pressure unit we make is 60 PSI. Therefore all your zones and your shower would be at 60 PSI.
Sorry to confuse you. Just wanted you to know the options.
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