Sorry, could you provide a little more information? You say it leaks from the “valve”, but there are 3 different places it could be leaking from, and all are part of the valve – the valve being the whole device from pipe to pipe.
If you’re thinking of replacing the whole thing, I’d focus more on the type of pipe, which looks like Pex coming from the house, and probably some sort of standard dishwasher feed line on the other side.
Ideally you could buy a replacement valve before starting the project, but you might have to remove this valve and take it to the hardware store to make sure you get the correct thing.
I’ve never worked with Pex, but I believe you can either crimp it with a special tool or use the sharkbite system.