Why Does a Pressure Regulator's Consistency Vary Inversely w/ it's Setpoint?
Why Does a Pressure Regulator's Consistency Vary Inversely w/ it's Setpoint?
(OP)
In my research, most manufacturers seem to list a pressure regulator's accuracy in terms of a percentage of the target output pressure. So a pressure regulator with a 1% accuracy set to 100psi will only be +or- 1psi whereas the same regulator set to say 500psi (for illustrative purposes) will be +or- 5psi.
Ive studied up on the factors that contribute to regulator stability or instability (spring rate, sensing face area, cycling of the valve stem, etc.) but I cant figure out for the life me why the consistency would vary inversely with the output pressure.
Ive studied up on the factors that contribute to regulator stability or instability (spring rate, sensing face area, cycling of the valve stem, etc.) but I cant figure out for the life me why the consistency would vary inversely with the output pressure.





RE: Why Does a Pressure Regulator's Consistency Vary Inversely w/ it's Setpoint?
Your mistake is in thinking the 100 psi and 500 psi regulators are the same. Accuracy is defined as a percentage of full scale not percentage of actual pressure.
RE: Why Does a Pressure Regulator's Consistency Vary Inversely w/ it's Setpoint?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way