So what’s the difference between an ordinary solenoid valve and one with flow control?
Basically its the large ‘dial’ in the middle that you can turn to adjust the rate at which water flows thru the valve. You may choose to use one of these if you have a small station and do not want you retic operating at full capacity.
For example some people have a small veggie patch that needs some very specific watering. Rather than adding the veggies patch to the lawn station or to other garden beds they would irrigate it separately. In that instance it may be necessary to reduce the flow and use this type of valve.
Any alternative is to use an inline tap to reduce to flow.