If a spunding valve is intended to release excess pressure from a container, would it be possible to do it in reverse to only allow CO2 (from a tank) into the container when a specific negative pressure is reached inside the container during cold crash? Think spunding valve in reverse. Valve is connected to fermentation container and other end of valve is connected to Co2 tank. When negative pressure inside fermentation container reaches the setting on the valve, it opens to allow CO2 in and then closes when pressure is equalized again. Thoughts?