Was the old pump an SK model like the new one? I don't think those pumps are as good as a regular submersible well pump. They are made to pump effluent water like from a storage tank. And if you were using enough water with the old pump that the pressure stayed at 40 PSI and the pump did not cycle off, then you need that large of a pump. You will have less pressure and less flow with the smaller pump, and I don't think you will be happy.
There is no problem using a large pump to do a large job. The cycling problem that destroys the pump happens when you have a large pump doing small jobs. That is what a Cycle Stop Valve does. It keeps the large pump from cycling while you are doing small watering jobs, and makes the pump last many times longer than normal.
Everybody wants you to put in a smaller pump so it won't cycle so much and will last longer. But with the smaller pump you will have even less pressure and flow when needing to irrigate or do large watering jobs. With a larger pump you would have more flow and better pressure for irrigating and stuff, then the CSV would make it work like a small pump when needed, which makes the pump last a long time.
your sound right to me, and thank you so munch for your post. When I hire them I don't even know there company they just family owner,i told them I had 1 1/2 hp pump ,they say too big, and I told them I used much water, because I leave in my house I know they don't belive,told them many times they still do there way, no one want pay for any thing they don't like
I tell them install CSV on my system well man say they put thousand in and remove thousand out he say I don't need CSV
Pump they give me 100% made in china .it had plastic screen middle of pump it will block very easy because I got hard water over here
when I need water the pump run it take long time to stop,i tell them water weak he set pressure swich 40 psi start 75 psi stop(75psi make 1 hp oversea pump don't last long as I short thinking)
will tell them install 1 1/2 pump back on today they made fell very bad to complain about the pump .would you and everyone here stay with me unit I had final thank a lot website here ,