NF EN ISO 4126-4

NF EN ISO 4126-4

September 2013
Standard Current

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

ISO 4126-4:2013 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. ISO 4126-4:2013 is a product standard and it is not applicable to applications of pilot operated safety valves.

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Main informations

Collections

National standards and national normative documents

Thematics

Sécurité, Gestion des risques et SST, QSE

Publication date

September 2013

Number of pages

27 p.

Reference

NF EN ISO 4126-4

ICS Codes

13.240   Protection against excessive pressure
23.060.40   Pressure regulators

Classification index

E29-417-4

Print number

1 - 23/08/2013

International kinship

ISO 4126-4:2013

European kinship

EN ISO 4126-4:2013
Sumary
Safety devices for protection against excessive pressure - Part 4 : pilot operated safety valves

ISO 4126-4:2013 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.

ISO 4126-4:2013 is a product standard and it is not applicable to applications of pilot operated safety valves.

Replaced standards (1)
NF EN ISO 4126-4
July 2004
Standard Cancelled
Safety devices for protection against excessive pressure - Part 4 : pilot operated safety valves

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

Table of contents
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  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Symboles et unités
    5
  • 5 Conception
    5
  • 5.1 Généralités
    5
  • 5.2 Raccordements d'extrémité
    6
  • 5.3 Exigences minimales pour les ressorts
    7
  • 5.4 Matériaux
    7
  • 6 Essai de production
    7
  • 6.1 Objet
    7
  • 6.2 Généralités
    7
  • 6.3 Essai hydrostatique
    8
  • 6.4 Essai pneumatique
    8
  • 6.5 Ajustement de la pression de réglage ou de début d'ouverture
    9
  • 6.6 Essai d'étanchéité du siège
    9
  • 6.7 Joints sous pression
    10
  • 7 Essai de type
    10
  • 7.1 Généralités
    10
  • 7.2 Essais de détermination des caractéristiques de fonctionnement
    11
  • 7.3 Essais de détermination des caractéristiques de débit
    13
  • 7.4 Détermination du coefficient de débit
    15
  • 7.5 Certification du coefficient de débit
    15
  • 8 Détermination des performances d'une soupape de sûreté pilotée
    15
  • 9 Dimensionnement des soupapes de sûreté pilotées
    15
  • 10 Marquage et plombage
    15
  • 10.1 Marquage
    15
  • 10.2 Plombage d'une soupape de sûreté pilotée
    16
  • Bibliographie
    17
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