Check valve on Aquasafe ro/di

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My Aquasafe unit will not shutoff after making water.

Is the valve on the membrane housing a one way check valve or something else (Aquasafe's site calls it a pressure valve)?

Disassembled and cleaned the ASOV but didn't work this time. Forums also point to the valve so checked it. Can blow through with slight restriction both ways (maybe a little more restrictive from the plastic to metal side) but it's not acting like a one way.

With the Aquasafe my understanding the restrictor is part of the flush valve (labeled 'Aquasafe exclusive E-Z Flush Flow Restrictor').