Hydraulic circuit - Linear pressure drop from a pressurized system.

Hello

I'm trying to design a pressure test circuit and I am a bit stuck here.

Hydraulics is not my regular field, so please bear with me.

So I have to pressurize a chamber and then after holding the pressure for a given time it has to be released.
The problem I'm having is getting a constant pressure decrease.
Put another way, I want the pressure decrease over time to be linear.

Is this possible to achieve this using a "simple" circuit or do I have to introduce some kind of computer controlling to make this happen?

If so, is there anything commercially viable?

Thanks in advance.

You want a Hydraulic Flow Control Valve, specifically a Volumetric flow rate control valve. The pressure will drop linear with constant flow out of the pressurized system.

Search the internet for "Hydraulic Flow Control Valve" - this is a common device.