Positive crankcase pressure valves? Possible. Not quite sure what they do.but have an idea.may be wrong. .or why they are there. first, do we need.? and if so cant we just get rid of these pipes that block up? Pcv valves. And replace with a neat smart little catch tank thing.thatll be easyer to take off and clean and replace and wash out every few or six months?

It just vents gasses back into the inlet from the crank case. The valves are a basic ball and spring design. Ball opens at idle and lets gases out back into the inlet fannymould. When the engine is at speed, it all closes up.

 

Yes, we need, you can't simply plug the hole, as you'll get blow-by, however as you've suggested, you can do away with them and fit catch tanks. However, on a regular road car, working PCV valves are just fine. I had mine replaced 8 years ago with new OEM items and they're just fine.