Would the level of the return pipe cause banging pipes?

We rescently had a new Burnham Boiler installed for a steam heat sysem. Since the installation we have had more banging pipes than we ever had with the old system. A relief valve located after the last radiator on the return pipe was pushing out water and our service man replaced the valve. We still have the banging pipes. What I was wondering is whether the return pipe to the boiler should be higher than the boiler water level?