The sewage shaft is underwater

Hello dear ones!
Before I call the executing company again, I would like to ask you for advice.
I have a question about a sewage shaft. So I mean these rings made of concrete.

At the beginning of the year, we had an electric non-return valve installed in front of our new building.
It is located underground, in two concrete rings. This was installed professionally.

After a few weeks, these two rings started to become wet inside at the point where they lay on top of each other.
Supposedly this is normal and nothing could happen.
Then it rained for several days in a row and so much water came through that we carried it out again by the bucketful.

We had the manhole cover of the shaft open during the last few days of good weather so that the remaining puddle could dry up.

Then it rained normally one night and the rings were wet again.
Is it really normal and harmless if the rings become wet after rain?
Should the rings possibly be sealed inside or outside with something?
It can’t be that the valve stands in water after every heavy rain shower!?
Was something done wrong during the installation?

Thanks in advance

Does the water from the shaft not flow into the wastewater sewer of the city / municipality?

The wastewater flows from the house through the electric check valve to the lifting station. The shaft in which the check valve is located is walkable, thus normally dry.

I don't quite understand yet where the water on the shaft with the check valve goes.

It should normally flow further into the sewer system, possibly via a lifting station. In any case, there shouldn't be any water standing in the shaft because it should always be flowing away. It doesn't matter whether the water comes through the concrete rings or through the supply line.

The shaft serves only as a location for the check valve and is not meant to collect water. The wastewater flows through the piping into the sewer system.

It looks similar to this picture. The flap is located in the shaft, and rainwater penetrates from outside through it and submerges the flap.

Hello,

water penetrates into the shaft from outside?

I am neither a plumber nor a concrete worker, but in my opinion, the individual shaft elements should be sealed and/or connected using well foam (or a similar material), right?

This was definitely done that way with our inspection shaft.

Regards,

Dirk