The concept of various pressure of safety valve
Nominal pressure means the maximum allowable pressure sof afety valve at room temperature, high temperature equipment safety valves should not consider high temperature materials allowable stress reduction. The safety valve is designed and manufactured according to nominal pressure standard.
Opening pressure: also 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
