If you need want a manually controlled system, the solution is very straightforward. You can set the reference pressure with a standard forward pressure reducing regulator. Since you are just setting the pressure in a small dead volume, the consumption will be zero during operation. You need to select a manual regulator with a small Cv for good precision. Equilibar offers a wide range of manual pressure reducing regulators that match their product line. Most of these regulators are in stock and have short delivery times. We can add some pressure gauges to the combination to make your pressure controller plug and play.
The working of an Equilibar Dome Loaded Back Pressure Regulator
Low Pressure High Flow Regulators
Demonstration of the LPR2 High Precision Ultra Low Pressure Reducing Regulator
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