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Security valves with two connectors open if the pressure exceed a value x +/- tolerance on one side. I'd like to know if there's a mechanical valve which opens if the pressure on one side sinks below a certain value.

The use case is a system with a desired pressure d (e.g. 2 bar), but irregular pressure during operation (because it's based on bio mass fermentation) and a gas storage which stores extranous gas if the pressure is above 2 bar. This storage needs a value which can release pressure from the storage into the system if the pressure in the system sinks below the desired pressure.

Kalle Richter
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  • This should answer a small portion of http://engineering.stackexchange.com/questions/13494/which-components-to-use-for-a-co2-gas-storage, so it's not a duplicate. – Kalle Richter Feb 01 '17 at 14:05

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You're looking for a pressure regulator (and this is indeed what you need in your use case, but that is another question.) The regulator works so that over a range of flows, the pressure on the outlet side is kept constant.

mart
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