The Safety Valve is devised to nominal pressure standard.
Opening pressure: known as set pressure, is the medium pressure of disc starts rising in the operating conditions.
Discharge pressure: disc achieves the required height of inlet pressure
Back Seat pressure: the inlet pressure after safety valve discharge, the disc re-compress the valve seat, medium stops discharging. Back seat pressure is characterized by the use of the quality of an important parameter, generally require at least 80% of the working pressure, the upper limit in order to not cause disc jump frequently.
Hoist pressure: Open pressure and the back seat pressure difference

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