olof_n:
Hi!My watering system in my greenhouse have worked perfetct for several years.
I have a 12V pump and ten electric solenoid valves (cheap from ebay). The pump starts and then one valve is opened at a time.
The valves open/close fine. When closed no water is leaking.Each plant can get there individual amoung of water.
Don't the electric solenoid valves require a certain water pressure to work? Can you link to the electric valves you bought on ebay, and the 12V pump?