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The regulators are only able to handle a certain amount of pressure on the inlet and make a much lower pressure on the outlet side. Typically for residential about 1/2 psi for the inlet side and 7" of WC on the outlet side. Manifold pressure before the burners is typically around 3" WC for residential equipment +/-.
I would have thought that a spiking inlet pressure would maybe cause leaks through the diaphragm to the atmospheric vent.
Who knows? Maybe ancient equipment in older homes was not able to handle a large change of inlet pressure? Perhaps air had entered the system somewhere and caused these issues? Not sure.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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