It is probably a little low, not high. Most systems are set to values about 20#'s apart. It turns on at 20 in your case, and shuts off at 40. Putting pressure in the bladder tank keeps the bladder from expanding too much and failing early. The pump provides the energy to compress the air in the tank. The spring in the bladder keeps pressure while the pump rests prior to needing to turn back on at 20 pounds, pushing that stored water out of the tank.