Hi im about to design logic gates application. I want to know on how to put a delay in logic gates?

thanks

 

It depends on the length of the delay you want.

 

so how im gonna achieve that? do i need some kind of circuit or special logic gates?

 

What is the length of the delay?

 

about 5 seconds after the valve is switched on

 

Now you're talking. Use a 555 timer circuit.