Cycling the pump on and off is the cause of most tank bladder failures, as well as failure of pump/motor and other controls. Regardless of the size of the tank, the bladder bends back and forth with each cycle of the pump, until it breaks like when bending a wire back and forth multiple times.
It is also very important that the bladder be able to expand and contract without touching the side or any part of the tank body. The style of bladder tank determines if the bladder touches the tank wall when working up and down. Bladders or bags usually drag the sides of the tank where a diaphragm style tank does not.
Other than that, limiting the cycling is the best way to get the most life out of any “bladder” tank. When you use a CSV before the tank, you don’t need a very large tank. With a 40/60 switch, the CSV would hold a steady 50 for the house while using water. With the CSV holding a constant 50 PSI, the diaphragm or bladder is not moving. This makes the diaphragm or bladder last a long time as compared to a system without a CSV that is constantly flexing the bladder up and down as the pressure continually goes from 40 to 60 and vice versa.
