Nominal pressure: indicates the maximum allowable pressure of the safety valve at normal temperature. The safety valve for high temperature equipment should not consider the reduction of the allowable stress of the material at high temperatures. Safety valves are designed and manufactured to nominal pressure standards.
Opening pressure: also called rated pressure or setting pressure, refers to the inlet pressure of the safety valve flap when it starts to rise under operating conditions. Under this pressure, there is a measurable opening height, and the medium is visually or audibly perceptible. Continuous discharge status.
Discharge pressure: The inlet pressure at which the valve flap reaches the specified opening height. The upper limit of discharge pressure is subject to the requirements of relevant national standards or specifications.
Excessive pressure: The difference between the discharge pressure and the opening pressure, usually expressed as a percentage of the opening pressure.
Respiratory pressure: After the discharge, the valve flap is re-contacted with the valve seat, that is, the inlet pressure when the opening height becomes zero.
Opening and closing pressure difference: the difference between the opening pressure and the returning pressure, usually expressed as a percentage of the return pressure and the opening pressure, and is expressed by the pressure difference between the two when the opening pressure is low.