Hi micvanzil

It is not clear where you put PCV valve assembly & by pass.
I guess it is at top of tank roof & place in horizontal position.
For control valve assembly it is conventional practice to put a line stop ( semi anchor ) to take care of unbalance load.
In your case may be nozzle itself serve the purpose of semi anchor.
Check nozzle load for thermal as well as additional PCV load.
You may some times can put line stop with gap where there is problem with thermal stress.

Regards

Habib