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ISO 4126 is the leading standard for protecting pressurized systems against excessive pressures. It includes nine parts for safety valves, bursting disks, pilot-operated valves, and controlled pressure relief systems. Single and two-phase flow is covered. The standard does not fully reflect the current state of technology applied in many companies, especially the zero-emission trends. For years, a direct discharge of fluids from safety valves or bursting disks into the environment has beendoi:10.3303/cet2290084 doaj:b719406263f14157a6b0a53f3458d053 fatcat:ibxb7avo2jbx3epr46autqdjxa