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Pressure Relief Safety Question...
We changed our pressure relief valve on our steam boiler with the same one that's been there for many, many years. It is a Cobraco Industies, Inc,, 13500 Series.
Here is a warning on the tag of the relief valve, verbatim:
<span style="font-size:12pt"><strong>The minimum required operating pressure margin for this type of safety valve is 4 PSI. UNDER NO CIRCUMSTANCES SHOULD THIS MARGIN BE LESS THAN 4 P.S.I.! </strong></span>
<span style="font-size:12pt"><strong> </strong></span>
<span style="font-size:12pt"><strong>Failure to maintain this margin may result in leakage past the seal and an accumulation of deposits on the seating surface. Excessive deposits may prevent the safety valve from operating properly, and a dangerous pressure buildup and equipment rupture may result.</strong></span>
Low pressure is what we're looking for when operation a steam boiler, 1 to 2 psi, maybe in some cases 3 psi.
The question is:
If we only want 1 - 3 psi, why does the tag on the relief valve caution us that a minimum of 4 psi must be maintained to avoid problems?
Any pros or knowledgeable DIY'ers offer an explanation?
Thank you for your inputs and thoughts on this.