EN 736-3:2008

Valves - Terminology - Part 3: Definition of terms

This European standard defines the terms and their definitions (or the source if defined in other European standards) used for several types of valves or in several fields of application. These terms concern the pressures and temperatures, the dimensions, the design, the flow control characteristics and the test of valves.
The terms and definitions in this European standard may also apply to products other than valves, in which case it may be necessary to apply these definitions analogously.
This European standard covers terms common to more than one type of valve.
The terms and definitions specific to one type of valve, or to one application are found in the relevant product standard or fitness for purpose standard.

Armaturen - Terminologie - Teil 3: Definition von Begriffen

Diese Europäische Norm legt die für verschiedene Armaturenbauarten bzw. verschiedene Anwendungs¬bereiche verwendeten Begriffe und deren Definitionen fest (oder gibt die Quelle an, sofern in anderen Europäischen Normen festgelegt). Diese Begriffe umfassen die Drücke und Temperaturen, die Maße, die Konstruktion, die Durchflusscharakteristiken sowie die Prüfung von Armaturen.
Die in dieser Europäischen Norm festgelegten Begriffe können auch für andere Erzeugnisse als Armaturen gelten, in diesem Fall kann eine sinngemäße Anwendung dieser Definitionen erforderlich sein.
Diese Europäische Norm enthält Begriffe für mehrere Armaturenbauarten.
Die ausschließlich für eine bestimmte Armaturenbauart bzw. einen bestimmten Anwendungsbereich geltenden Begriffe sind der entsprechenden Produkt- oder Gebrauchstauglichkeitsnorm zu entnehmen.

Appareils de robinetterie - Terminologie - Partie 3 : Définition des termes

La présente Norme européenne spécifie les termes et leurs définitions (ou leur origine lorsqu'ils sont définis
dans d'autres normes) utilisés pour plusieurs types d’appareils de robinetterie ou dans plusieurs secteurs
d’application. Ces termes concernent les pressions et températures, les dimensions, la conception, les
caractéristiques de débit et les essais des appareils de robinetterie.
Les termes et définitions de la présente norme peuvent aussi être applicables à des produits autres que des
appareils de robinetterie ; dans ce cas, il peut être nécessaire d'appliquer ces définitions par analogie.
La présente Norme européenne couvre les termes communs à plusieurs types d'appareil de robinetterie.
Les termes et les définitions spécifiques d'un type d'appareil de robinetterie, ou d'une application se trouvent
dans la norme de produit ou la norme d’aptitude à l’emploi appropriée.

Ventili - Terminologija - 3. del: Definicije izrazov

General Information

• Status: Published
• Publication Date: 29-Jan-2008
• Withdrawal Date: 30-Jul-2008
• ICS: 01.040.23 - Fluid systems and components for general use (Vocabularies)
• ICS: 23.060.01 - Valves in general
• Technical Committee: CEN/TC 69 - Industrial valves
• Drafting Committee: CEN/TC 69/WG 1 - Basic standards
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 05-Feb-2024
• Completion Date: 14-Apr-2025
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: SIST EN 736-3:2008 - Valves - Terminology - Part 3: Definition of terms

Relations

• Replaces: EN 736-3:1999/A1:2001 - Valves - Terminology - Part 3: Definition of terms
• Effective Date: 22-Dec-2008
• Replaces: EN 736-3:1999 - Valves - Terminology - Part 3: Definition of terms
• Effective Date: 22-Dec-2008

Overview

EN 736-3:2008 is a European standard developed by CEN (European Committee for Standardization) that defines terminology related to industrial valves. Specifically, this part of the EN 736 series focuses on the definition of terms commonly used across various types of valves and applications. The standard harmonizes vocabulary used in pressures, temperatures, dimensions, design features, flow characteristics, operational aspects, and testing related to valves.

This standardized terminology supports enhanced clarity and consistency for engineers, manufacturers, and end-users in the industrial valve sector throughout Europe and beyond.

Key Topics

EN 736-3:2008 covers essential valve terminology grouped into the following categories:

• Pressure and Temperature Terms
  Defines maximum allowable pressure, test pressure, maximum/minimum allowable temperature, test temperature, and classification by PN and Class standards.

• Dimensions
  Includes standardized terms like nominal size (DN), face-to-face and centre-to-face dimensions, travel and relative travel, ensuring consistent measurement criteria across the industry.

• Design Concepts
  Clarifies terms such as full bore valve, clearway valve, reduced bore valve, symmetric and asymmetric valves, anti-static and anti-blow out designs, along with coating definitions to enhance corrosion resistance.

• Flow Characteristics
  Describes flow coefficients, flow resistance coefficients, cavitation phenomena, and inherent flow characteristics critical for valve performance assessment.

• Operation Parameters
  Defines important operational terms like operating torque, strength torque, and torque application points relevant to valve actuation.

• Testing Procedures
  Covers type tests, production tests, and acceptance tests which validate valve conformity and quality during and post-manufacture.

The standard also references related European and international standards to maintain alignment with existing industry norms.

Applications

EN 736-3:2008 provides vital terminology applicable in multiple practical contexts including:

• Valve Manufacturing
  Using harmonized definitions enables manufacturers to design, test, and produce valves that meet widely recognized European standards, facilitating market access and interoperability.

• Engineering and Design
  Consistent terminology aids engineers in specifying valve requirements clearly, ensuring proper selection and interface with piping and equipment.

• Quality Control and Testing
  Clear definitions help quality teams conduct standardized tests like type and production tests, ensuring valves meet safety and performance requirements.

• Procurement and Documentation
  Buyers and project managers benefit from standard vocabulary when preparing specifications, ordering, and reviewing technical documents.

• Regulatory Compliance
  Alignment with EN 736-3 assists compliance with European Directives related to pressure equipment and fluid systems.

Related Standards

EN 736-3:2008 complements and references several related standards to form a comprehensive framework for valve terminology and specifications:

• EN 736-1, EN 736-2
  Deal respectively with valve types and valve components terminology.

• EN 558
  Face-to-face and centre-to-face dimensions of metal valves.

• EN 764-1
  Terminology concerning pressure, temperature, volume, and nominal size in pressure equipment.

• EN 1333 and EN 1759
  Define flanges, joints, and their classifications-key in valve connections.

• EN 12982
  Specifies dimensions for welding-end valves.

• EN 60534-1 (IEC 60534-1:2005)
  Covers control valve terminology and flow characteristics.

• EN ISO 6708
  Defines nominal pipe sizes (DN).

By adhering to EN 736-3:2008 and its related standards, stakeholders in the valve industry ensure precise communication, optimized valve design, performance, and compliance-fundamental for fluid control systems in various industrial sectors.

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Keywords: EN 736-3:2008, valve terminology, European valve standards, industrial valves definitions, valve pressure standards, valve dimensions, valve design terms, flow characteristics in valves, valve testing standards, CEN valve standard, valve operational terms, valve manufacturing standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2008
1DGRPHãþD
SIST EN 736-3:2000
SIST EN 736-3:2000/A1:2002
Ventili - Terminologija - 3. del: Definicije izrazov
Valves - Terminology - Part 3: Definition of terms
Armaturen - Terminologie - Teil 3: Definition von Begriffen
Appareils de robinetterie - Terminologie - Partie 3 : Définition des termes
Ta slovenski standard je istoveten z: EN 736-3:2008
ICS:
01.040.23 7HNRþLQVNLVLVWHPLLQVHVWDYQL Fluid systems and
GHOL]DVSORãQRUDER6ORYDUML components for general use
(Vocabularies)
23.060.01 Ventili na splošno Valves in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 736-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2008
ICS 01.040.23; 23.060.01 Supersedes EN 736-3:1999
English Version
Valves - Terminology - Part 3: Definition of terms
Appareils de robinetterie - Terminologie - Partie 3 : Armaturen - Terminologie - Teil 3: Definition von Begriffen
Définition des termes
This European Standard was approved by CEN on 14 December 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 736-3:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
3.1 Terms relating to pressure and temperature .5
3.2 Terms relating to dimensions.6
3.3 Terms relating to design .7
3.4 Terms relating to flow characteristics.8
3.5 Terms relating to operation .9
3.6 Terms relating to tests .9
Annex A (informative) Glossary .10

Foreword
This document (EN 736-3:2008) has been prepared by Technical Committee CEN/TC 69 “Industrial valves”,
the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by July 2008, and conflicting national standards shall be withdrawn at the
latest by July 2008.
This document supersedes EN 736-3:1999.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

Introduction
EN 736-3 harmonizes the definitions of terms for valves. EN 736-1 deals with the definitions of types of valves
and EN 736-2 with definitions of components.
It is possible that other terms and their definitions are found in other European standards.
Experts writing European standards are asked to use the terms and definitions given in this European
standard. If other terms and definitions are necessary or are published in other European standards, please
inform the secretariat of CEN/TC 69 so that the terms and definitions in these European standards can be
included or harmonized.
1 Scope
This European standard defines the terms and their definitions (or the source if defined in other European
standards) used for several types of valves or in several fields of application. These terms concern the
pressures and temperatures, the dimensions, the design, the flow control characteristics and the test of valves.
The terms and definitions in this European standard may also apply to products other than valves, in which
case it may be necessary to apply these definitions analogously.
This European standard covers terms common to more than one type of valve.
The terms and definitions specific to one type of valve, or to one application are found in the relevant product
standard or fitness for purpose standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 558, Industrial valves — Face-to-face and centre-to-face dimensions of metal valves for use in flanged
pipe systems — PN and Class designated valves
EN 764-1, Pressure equipment - Part 1: Terminology - Pressure, temperature, volume, nominal size
EN 1333, Flanges and their joints — Pipework components — Definition and selection of PN
EN 1759 (all parts), Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories,
Class designated
EN 12982, Industrial valves — End-to-end and centre-to-end dimensions for butt welding end valves
EN 60534-1, Industrial-process control valves — Part 1: Control valve terminology and general considerations
(IEC 60534-1:2005)
EN ISO 6708, Pipework components — Definition and selection of DN (nominal size) (ISO 6708:1995)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Terms relating to pressure and temperature
3.1.1
maximum allowable pressure
PS, Ps, ps: see EN 764-1
3.1.2
test pressure
P , p : see EN 764-1
test t
3.1.3
maximum/minimum allowable temperature
TS, t : see EN 764-1
S
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