8 Determination of safety valve per

8 Determination of safety valve performance Refer to ISO 4126-7. 9 Sizing of safety valves Refer to ISO 4126-7. 10 Marking and sealing 10.1 Marking 10.1.1 Marking on the shell of a safety valve Marking on the shell of a safety valve may be integral with the shell or on a plate securely fixed on the shell. The following minimum information shall be marked on all safety valves: a) size designation (inlet), for example DN xxx; b) material designation of the shell; c) manufacturer’s name or trademark; d) an arrow showing the direction of flow where the inlet and outlet connections have the same dimensions or the same pressure rating. 10.1.2 Marking on an identification plate The following information shall be given on an identification plate securely fixed to the safety valve: a) set pressure, in bar gauge or other internationally recognized unit; b) reference to this part of ISO 4126, i.e. ISO 4126-1:2013; c) manufacturer’s type reference; d) certified de-rated coefficient of discharge indicating reference fluid: “G” for gas, “S” for steam and “L” for liquid; NOTE The designation of the fluid can be placed either before or after the certified de-rated coefficient of discharge, e.g. G-0,815. e) flow area, in square millimetres or any other internationally recognized unit; f) minimum value of the lift, in millimetres or any other internationally recognized unit, and corresponding overpressure, expressed as, for example, a percentage of set pressure; g) cold differential test pressure (if applicable) in bar gauge or other internationally recognized unit; h) serial number or alternative coding to indicate year of manufacture. 10.2 Sealing of a safety valve All external adjustments shall be sealed.