Fluid Handling

Essentially a bump of https://ideas.captain-of-industry.com/suggestions/270964/pressure-overflow-valves-for-fluid-storage, but with a bit of a twist.
Essentially, think of fluid valves from Factorio.
An overflow valve that only lets fluids through when the input side is more than %80 full (So you could store products like Sour Water that you know you'll need later, but can't process now, while still dumping if you overflow so the system doesn't stop working),