I am sorry, but I do not understand what you mean. I need to turn the servo on for about 1 second to open the valve. Then it waits 1 hour and then it will again power on the servo and will stop the valve + then power off the servo for 1 day. So I think that the transistor would be probably good solution. But as I never used transistors for power control yet, I asked in this tread what would be the best solution.