BS EN ISO 4126-4:2004 - Safety devices for protection against excessive pressure. Pilot operated safety valves – BSI British Standards

BS EN ISO 4126-4:2004

Safety devices for protection against excessive pressure. Pilot operated safety valves

Status : Revised, Superseded, Withdrawn   Published : April 2004 Replaced By : BS EN ISO 4126-4:2013

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BS EN ISO 4126-4:2004 Safety devices for protection against excessive pressure. Pilot operated safety valves

BS EN ISO 4126-4 specifies general requirements for pilot operated safety valves, other than those covered in Part 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.

It 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.

Contents of BS EN ISO 4126-4:

  • Scope
  • Normative references
  • Terms and definitions
  • Symbols and units
  • Design
  • General
  • End connections
  • Minimum requirements for springs
  • Materials
  • Production testing
  • Purpose
  • General
  • Hydrostatic testing
  • Pneumatic testing
  • Adjustment of set or cold differential test pressure
  • Seat leakage test
  • Pressure seals
  • Type testing
  • General
  • Tests to determine operating characteristics
  • Tests to determine flow characteristics
  • Determination of the coefficient of discharge
  • Certification of coefficient of discharge
  • Determination of pilot operated safety valve performance
  • Determination of coefficient of discharge
  • Critical and subcritical flow
  • Discharge capacity at critical flow
  • Discharge capacity for any gas at subcritical flow
  • Discharge capacity for non-flashing liquid as the test medium in the turbulent zone where the
  • Reynolds number Re is equal to or greater than 80 000
  • Sizing of pilot operated safety valves
  • General
  • Valves for gas or vapour relief
  • Calculation of capacity
  • Marking and sealing
  • Marking
  • Sealing of a pilot operated safety valve
  • Examples of capacity calculations for various media
  • Capacity calculations for gaseous media at critical flow
  • Capacity calculations for gaseous media at subcritical flow
  • Capacity calculations for liquids
  • Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC (PED)

 




Standard NumberBS EN ISO 4126-4:2004
TitleSafety devices for protection against excessive pressure. Pilot operated safety valves
StatusRevised, Superseded, Withdrawn
Publication Date08 April 2004
Withdrawn Date31 July 2013
Normative References(Required to achieve compliance to this standard)EN 1092-1, EN 1092-2, EN 1092-3, prEN 1759-1, EN 12516-3, EN 12627, EN 12760, EN ISO 6708, ISO 6708:1995, ISO 7-1, ASME B1.20.1
Informative References(Provided for Information)97/23/EC
Replaced ByBS EN ISO 4126-4:2013
International RelationshipsEN ISO 4126-4:2004,ISO 4126-4:2004
Amended ByCorrigendum, June 2009.
Draft Superseded By99/704033 DC
DescriptorsSafety devices, Pressure equipment, Safety valves, Valves, Performance testing, Type testing
ICS13.240
23.060.40
Title in FrenchDispositifs de sécurité pour protection contre les pressions excessives. Soupapes de sûreté pilotées
Title in GermanSicherheitseinrichtungen gegen unzulässigen Überdruck. Pilotgesteuerte Sicherheitsventile
CommitteePSE/18/6
ISBN978 0 580 67724 3
PublisherBSI
FormatA4
DeliveryNo
Pages34
File Size786 KB
Price£214.00


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