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ISO 4126-4:2004

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

General information

Withdrawn from 12.07.2013
Directives or regulations
None

Standard history

Status
Date
Type
Name
12.07.2013
Main
Main
ISO 6718:1991
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.

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