My pressure has been around 8-10 psi and the cut-in control shuts everything down at 9 psi.
Are you sure that this is a steam boiler? If so, it must be heating a commercial facility - not a home. Residential steam boilers usually operate at 1 psi or less. A pressure switch regulates burner operation and setpoint/differential can be adjusted accordingly. Same goes for large facilities. Find the pressuretrol, adjust the setpoint down, adjust the differential.
why would you do that If 8 is the low and 10 is the high than the 9 is a desired.
USA Rob O is correct; most residential boilers operate on atmospheric pressure, usually at one PSI or less. Maximum operating pressure for a residential boiler is 15 PSI. Why do you want to reduce the pressure? If this is a commercial application, especially for process steam, the equipment using the steam might require a minimum 8 PSI. If this is for an apartment building, you might need the pressure to get the steam to all the radiators. If this is a residential boiler, for a single family home, do you have vents on the radiators? If yes, then you are running the pressure too high. Have a licensed certified HVAC technician check the system. Tell the tech what you want to accomplish, and they will check the system to see if you can.
