A Safety Valve is usually an overpressure relief valve, but not all pressure
relief valves are safety valves.
Dick Caro
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Richard H. Caro, Certified Automation Professional, CEO, CMC Associates,
2 Beth Circle, Acton, MA 01720
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A safety valve lifts at a desired pressure and resets at a pressure slightly below lift pressure( usually 3-4% on average but variies). A relief valve will lift at a desired pressure and reset itself at the same pressure (pop-off).
Safety valves are on equipment that need a large volume of pressure reduced to prevent equipment and personel damage vs. a relif valve is general on systems with lower pressure and maintain a set pressure ( water, air, oil).
Safety valve comes under the Pressure relief valve catagory. A safety valve is a spring loaded pressure relief valve that actuates based on upstream static pressure and characterized by rapid opening or pop action. Normally this valve is used for compressible fluids
Assuming safety valve are non modulating (on/off), if after the pressure exceeded set pressure pops the valve, and pressure drops back under set pressure, but still not low enough for the valve to close. Is there any solution to counter this, or we have to play around with the process to get the pressure lower?
"relief valve is a spring loaded pressure relief valve actuated
by the static pressure upstream of the valve. The valve
opens normally in proportion to the pressure increase over the
opening pressure. A relief valve is used primarily with incompressible
fluids.
safety valve is a spring loaded pressure relief valve actuated
by the static pressure upstream of the valve and
characterized by rapid opening or pop action. A safety valve
is normally used with compressible fluids."
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