ISO 4126-4:2004

Safety devices for protection against excessive pressure -- Part 4: Pilot-operated safety valves

ISO 4126-4:2003 specifies general requirements for pilot operated safety valves, other than those covered in ISO 4126-1, irrespective of the fluid for which they are designed. In all cases, the operation is carried out by the fluid in the system to be protected.

ISO 4126-4:2003 is applicable to pilot operated safety valves having a valve flow diameter of 6 mm and above which are for use at set pressures of 0,1 bar gauge and above. No limitation is placed on temperature.

This is a product standard and it is not concerned with applications for pilot operated safety valves.


General information

  • Status :  Withdrawn
    Publication date : 2004-02
  • Edition : 1
  • :
    ISO/TC 185
    Safety devices for protection against excessive pressure
  • 13.240
    Protection against excessive pressure

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