Steam safety valve opening pressure
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Is the opening pressure of the steam safety valve 10% or 3% of the set pressure?
Choose the valve based on your actual needs. Due to the varying types and structures of safety valves, this percentage cannot be used for setting. For reference.
It depends on the situation; the US standards and European standards differ, with the difference being around 10% generally
The safety valve should begin to open at the set pressure, and its discharge capacity should be no less than the rated capacity when the overpressure reaches the specified percentage.
The set pressure (i.e., the opening pressure) of a main safety valve not intended for use in fire scenarios is generally 1.1 times the maximum operating pressure of the equipment