if a boiler drops from 140psi to 80psi with no change in firing, would I need to change the safety valve?
There is not sufficient information on the boiler or the system to answer properly. Is the safety valve open or closed. A safety valve should not be open unless the boiler is over pressured. Has the load on the system changed? How do you know the firing has not changed. What measurements do you have to verify your statement?
