I dont find any information about Input and Output amount from Railcraft tanks.
How much mB Fluids or Gases the Tank Valves let through some pipes (Gt pipes for Buildcraft)?
Is there a difference between Iron and Steel tanks (Valves)?
I using Iron Tanks connected with Gt pumps and i want to know the Output Rate.

As we know, it is 250mB/t , I think :)

Nope, as of 9.5 its now 1k mb/t. And no, there is no difference.

OK thanks.