Since you don't say the pump is not lasting very long or the pressure in the house is low, I assume the problem is that you can hear the pump? If the pump is "always switching on" when you are not using any water, you have a leak somewhere that needs to be fixed. If the pump is only switching on when you use water it is working correctly. But if when it switches on the motor noise bothers you, it is because of a noisy pump, not the CSV. The pump will be noisy with or without the CSV.
With a small tank the pump will be noisy often, but for short periods of time. With a large pressure tank the pump will not be noisy as often, but will be noisy for longer periods of time while the large tank is filling.
If the pump was in a pump house or away from the main house, you would have strong constant pressure from the CSV and never know if the pump was on or not. If you have a cistern you can use a submersible, which is as quiet as you can get. There are also water cooled pump motors that don't have the noisy fan. But the water filled motors are expensive, give problems, and don't last very long.
Even though there is nothing wrong with it and the CSV is making your pump last longer and deliver strong constant pressure to your house, you can return it for a full refund even if it is just because you don't like it. Of course you will be the first in 30 years to not be able to see the benefits of a CSV and return it. So, maybe you should look for a way to make the pump more quite instead of blaming the CSV for something it didn't do?