What about a Triac with opto-isolated driver (Diac) ...to stay out of any 'solenoidy' thing?
I assume the sprinkler valves are AC driven... and you want to pull only two wires to the puck. With that setup you could use the off time to recharge a rechargeable power supply for your puck Just make sure the current is low enough to not make the valve solenoids switch. The off with low current vs. the on with 'high' current would still provide ample positive power balance...
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