Gets a bit confusing to explain but depending on the flowmeter and control valve you may be able to adapt them to Raven wiring.  Quite a few variables to give you a complete answer. 

The Hiniker flowmeter will be expecting 12V where most Raven harnesses will only have 5V.  There are ways around that.  Most newer control valves will probably work, some of the very first ones would not.