I want to use a Solenoid valve for my project, the valve will be used for water in which is facing one problem if there is no power, how can we get water from the valve, I don't want to add any kind of batteries in the project. wants to do it mechanically can someone suggest me some solutions for it? If there is an alternative I can use for the flow purpose, which can give us water with power and without power
Use something like this that's rated for whatever flow you need:
The blue knob at the back is a pull that allows the valve to manually actuate. You can also place an AC or DC coil over the valve to energize it electrically from a micro/plc/etc.