NF EN ISO 4126-4

NF EN ISO 4126-4

July 2004
Standard Cancelled

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

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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Main informations

Collections

National standards and national normative documents

Thematics

Sécurité, Gestion des risques et SST, QSE

Publication date

July 2004

Number of pages

30 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 - 11/08/2004

International kinship

ISO 4126-4:2004

European kinship

EN ISO 4126-4:2004
Sumary
Safety devices for protection against excessive pressure - Part 4 : pilot operated safety valves

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.

Replaced standards (4)
NF E29-410
September 1990
Standard Cancelled
Industrial valves. Safety and relief valves. Defintions of technical terms.

La présente norme définit lester mes techniques relatifs aux différents types de soupapes de sûreté et à leurs caractéristiques de fonctionnement.

NF E29-411
December 1988
Standard Cancelled
Industrial valves. Safety and relief valves. General design, test, maintenance marking, conditioning.

La publication de la présente norme a été jugée nécessaire afin de faire suivre à la normalisation française les évolutions de la normalisation ISO. Cette évolution s'accompagne d'une nouvelle structure donnée à l'ensemble des normes relatives aux soupapes de sûreté.

NF E29-412
September 1990
Standard Cancelled
Industrial valves. Safetu and relief valves. Operating and flow tests.

La présente norme définit les principes des essais nécessaires à la vérification des caractéristiques et/ou à la certification des soupapes de sûreté.

NF E29-414
April 1992
Standard Cancelled
Industrial valves. Safety valves. Examples for flowrate calculation of safety valves types S,G1,L1 and L2.

La présente norme donne la série des orifices de soupapes recommandés ainsi que des exemples de calculs du débit des soupapes de sûreté de types S, G1, L1 et L2 au sens de la norme NF E 29-411. Elle donne en outre, en annexe, des compléments pour le calcul du débit théorique des soupapes.

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Standard replaced by (1)
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.

Table of contents
  • Avant-propos
    3
  • 1 Domaine d'application
    4
  • 2 Références normatives
    4
  • 3 Termes et définitions
    5
  • 4 Unités et symboles
    9
  • 5 Conception
    9
  • 5.1 Généralités
    9
  • 5.2 Raccordements d'extrémité
    10
  • 5.3 Prescriptions minimales pour les ressorts
    12
  • 5.4 Matériaux
    12
  • 6 Essai de production
    12
  • 6.1 Objet
    12
  • 6.2 Généralités
    12
  • 6.3 Essai hydrostatique
    12
  • 6.4 Essai pneumatique
    13
  • 6.5 Ajustement de la pression de réglage à froid ou de la pression de début d'ouverture
    14
  • 6.6 Essai d'étanchéité du siège
    14
  • 6.7 Joints sous pression
    15
  • 7 Essai de type
    15
  • 7.1 Généralités
    15
  • 7.2 Essais de détermination des caractéristiques de fonctionnement
    16
  • 7.3 Essais de détermination des caractéristiques de débit
    18
  • 7.4 Détermination du coefficient de débit
    19
  • 7.5 Certification du coefficient de débit
    19
  • 8 Détermination des performances d'une soupape de sûreté pilotée
    19
  • 8.1 Détermination du coefficient de débit
    19
  • 8.2 Débit critique et sub-critique
    20
  • 8.3 Débit avec écoulement critique
    20
  • 8.4 Débit pour tout gaz quelconque avec écoulement sub-critique
    21
  • 8.5 Débit pour liquide autre qu'à auto-vaporisation comme fluide d'essai dans la zone de turbulence où le nombre de Reynolds Re
  • 9 Dimensionnement des soupapes de sûreté
    21
  • 9.1 Généralités
    21
  • 9.2 Soupapes pour décharge de vapeur ou de gaz
    21
  • 9.3 Calcul du débit
    21
  • 10 Marquage et plombage
    22
  • 10.1 Marquage
    22
  • 10.2 Plombage d'une soupape de sûreté pilotée
    23
  • Annexe A (informative) Exemples de calculs de débit pour différents fluides
    24
  • Annexe ZA (informative) Relations entre la présente Norme européenne et les Exigences Essentielles de la Directive de l'Union Européenne Directive 97/23/CE (DESP)
    28
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