This part of this European Standard specifies general requirements for pilot operated safety valves, other thanthose covered in Part 1,irrespective of the fluid for whichThey are designed. In all cases,The operation is carriedout byThe fluid inThe system to be protected.It is applicable to pilot operated safety valves having a valve flow diameter of 6 mm and above which are for use atset 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.
EN ISO 4126-4:2004 history
2013EN ISO 4126-4:2013 Safety devices for protection against excessive pressure - Part 4: Pilot-operated safety valves
2004EN ISO 4126-4:2004 Safety devices for protection against excessive pressure - Part 4: Pilot operated safety valves ISO 4126-4:2004