You will never suck an
oil pan in, especially with just a PCV valve. I have dry sump engines that pull around 15 inches of vacuum on the entire engine.
The PCV valve is simply just a check valved vent. At WOT, it does nothing. You normally complement the PCV with a valve cover breather or another source of venting.
I don't use PCV valves. I hate them. They have caused more issues than they help, especially on a higher end engine. Guys don't pay attention to them, the valves fail, or are not sized correctly, and then the engine starts smoking...