M00000682
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ISO 4126-4 2nd Edition, July 15, 2013 Safety devices for protection against excessive pressure - Part 4: Pilot operated safety valves
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 4126 specifies general requirements for pilot
operated safety valves, 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.
It is applicable to pilot operated safety valves having a valve
flow diameter of 4 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 applicable to
applications of pilot operated safety valves