NF ISO 3968

NF ISO 3968

November 2017
Standard Current

Hydraulic fluid power - Filters - Evaluation of differential pressure versus flow

ISO 3668:2017 specifies a procedure for evaluating differential pressure versus flow characteristics of hydraulic filters and constitutes a basis for agreement between the filter manufacturer and user.It also specifies a method for measurement of the differential pressure generated at different flow rates and viscosities by the relevant parts of a filter assembly, spin-on and any valves contained within the filter which are in the flow stream. The typical types of filter to be tested are as follows:Type 1: which are spin-on filters in which the replaceable unit does not include a filter head (it might or might not include the element by-pass valve);Type 2: which are spin-on filters in which the replaceable element is tested together with a filter head (it might or might not include the element by-pass valve);Type 3: which are filter assembly, usually of the replacement element type, that is the housing (head and bowl) and element.

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Main informations

Collections

National standards and national normative documents

Publication date

November 2017

Number of pages

23 p.

Reference

NF ISO 3968

ICS Codes

23.100.60   Filters, seals and contamination of fluids

Classification index

E48-677

Print number

1

International kinship

ISO 3968:2017
Sumary
Hydraulic fluid power - Filters - Evaluation of differential pressure versus flow

ISO 3668:2017 specifies a procedure for evaluating differential pressure versus flow characteristics of hydraulic filters and constitutes a basis for agreement between the filter manufacturer and user.

It also specifies a method for measurement of the differential pressure generated at different flow rates and viscosities by the relevant parts of a filter assembly, spin-on and any valves contained within the filter which are in the flow stream. The typical types of filter to be tested are as follows:

Type 1: which are spin-on filters in which the replaceable unit does not include a filter head (it might or might not include the element by-pass valve);

Type 2: which are spin-on filters in which the replaceable element is tested together with a filter head (it might or might not include the element by-pass valve);

Type 3: which are filter assembly, usually of the replacement element type, that is the housing (head and bowl) and element.

Replaced standards (1)
NF ISO 3968
May 2002
Standard Cancelled
Hydraulic fluid power - Filters - Evaluation of differential pressure versus flow characteristics

Le présent document spécifie une méthode d'évaluation des caractéristiques des pertes de charge crées par les filtres sans le circuit où ils sont installés. Cette perte de charge varie en fonction du débit. Il décrit la façon de mesurer non seulement la perte de charge d'un filtre mais aussi celle de ses divers éléments.

Table of contents
  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles
  • 5 Caractéristiques opérationnelles à soumettre à essai
  • 6 Filtre à soumettre à essai
  • 7 Équipement d'essai
  • 8 Mesurages
  • 9 Mode opératoire
  • 10 Présentation des résultats
  • 11 Phrase d'identification (référence au présent document)
  • Annexe A (informative) Introduction à l'équation et à la méthode de calcul de la perte de puissance
  • Bibliographie
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