Mockery

So I need an electronic solenoid valves for a tank project and wondering if a sprinkler valve would work in its place, cause a true PVC solenoid is like $200 and a sprinkler is around $20.

Please correct me if I'm wrong, but for the valve to be "aquarium safe" it:

• Can't have any water come in contact to metal
• Would type of plastic play a role?

Anything I could be missing?
Here is a link to the valve I'm thinking about using.
http://www.homedepot.com/Plumbing-Ir...atalogId=10053