# Can I increase pressure on the output side of a backstop/security valve?

I'm working on a system with non-deterministic pressure (because it's based on bio mass fermentation) where CO2 is generated and input into the system at maximal pressure x (e.g. 2 bar). If additional CO2 is produced it ought to be stored in a container with pressure > x and released back into the system through a pressure regulator if the pressure in the system falls < x.

I assume that the input side of the container/storage has to be a backstop valve in order to keep the pressure in the storage. Based on technical terms (which I only know superficially) it has to be a security valve, because it has the function of releasing pressure > x. Usually security valves do that into a space with less pressure (in my use case the pressure will be higher at the second occurance of over-production of CO2). Is there a backstop-security value which allows to redirect all pressure y with y > x into a container with pressure > y?

The container/storage has to contain a (different) security valve which releases pressure into the room if it exceed the maximum of the container.