Question about the fuel cooler control valve. 1.9 TDI PD (ATJ)

Hello everyone,

I had a leak in the power steering pneumatic system of my car, and I discovered that the pressure accumulator on the fuel cooler valve was defective.
I noticed that the valve is activated as soon as there is a vacuum, which means it's always activated whenever the engine is running. I haven't been able to find a matching solenoid valve.

Can someone explain how it works, or what happens if I simply block the valve in the actuated position? (I've already sealed the vacuum line).

VG
Rupert.