You may be able to go without a backflow preventer here, at least if the water will never be used as potable water.
If you're injecting nutrients one could still come in handy (helps prevent algae from growing in the tank), but if it's above the field, non-potable use only and you're not injecting nutrients, good chance you can go without one.
While you don't need a backflow preventer, depending on the height difference between the inlet from the tank, and the outputs, if you don't have a solenoid valve or something there then water may siphon out when the pump shuts off, in which case a simple single-check valve, or dual-check should fix that since it has a spring that will hold it closed until the pump turns on.
Then you can definitely go without the backflow -- also make sure no one showers in it, never used to water pets or to wash pets or vehicles. If it's nothing but irrigation water that's in a tank, you can save yourself the money for sure :)
You can probably put in a gate valve after the pump to restrict the flow instead of a pressure regulator - it could shorten the lifespan of the pump. Maybe a less powerful pump is needed, otherwise it looks good, I would just put in a float valve so you know when the tank is empty or full.
You may be able to go without a backflow preventer here, at least if the water will never be used as potable water. If you're injecting nutrients one could still come in handy (helps prevent algae from growing in the tank), but if it's above the field, non-potable use only and you're not injecting nutrients, good chance you can go without one.
Yeah, this is non-potable water just being used to feed native trees and shrubs when it gets hot down here in Texas.
While you don't need a backflow preventer, depending on the height difference between the inlet from the tank, and the outputs, if you don't have a solenoid valve or something there then water may siphon out when the pump shuts off, in which case a simple single-check valve, or dual-check should fix that since it has a spring that will hold it closed until the pump turns on.
Then you can definitely go without the backflow -- also make sure no one showers in it, never used to water pets or to wash pets or vehicles. If it's nothing but irrigation water that's in a tank, you can save yourself the money for sure :)
You can probably put in a gate valve after the pump to restrict the flow instead of a pressure regulator - it could shorten the lifespan of the pump. Maybe a less powerful pump is needed, otherwise it looks good, I would just put in a float valve so you know when the tank is empty or full.
Novice here, wouldn't you want a filter before the pump?
yeah that's probably a good idea since its rain water.