www bzfxw com BRITISH STANDARD BS EN 12334 2001 Incorporating Corrigendum No 1 and Amendment No 1 Industrial valves — Cast iron check valves The European Standard EN 12334 2001, with the incorporation[.]
Trang 1BRITISH STANDARD BS EN
12334:2001
Incorporating Corrigendum No 1 and Amendment No 1
Industrial valves — Cast iron check valves
The European Standard EN 12334:2001, with the incorporation of amendment A1:2004, has the status of a British Standard
ICS 23.060.50
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Copyright British Standards Institution
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Trang 2`,,,,,,-`-`,,`,,`,`,,` -This British Standard, having
been prepared under the
direction of the Engineering
Sector Committee, was
published under the authority
of the Standards Committee on
15 March 2001
© BSI 24 August 2004
ISBN 0 580 37042 9
National foreword
This British Standard is the official English language version of
EN 12334:2001, including corrigendum July 2002 and amendment A1:2004 It supersedes BS 5153:1974 which is withdrawn
The UK participation in its preparation was entrusted by Technical Committee PSE/7, Valves, to Subcommittee PSE/7/3, Cast iron valves, which has the responsibility to:
A list of organizations represented on this subcommittee can be obtained on request to its secretary
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of British
Standards Online
This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application
Compliance with a British Standard does not of itself confer immunity from legal obligations.
— aid enquirers to understand the text;
— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the
UK interests informed;
— monitor related international and European developments and promulgate them in the UK
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover
The BSI copyright date displayed in this document indicates when the document was last issued
Amendments issued since publication
14086 Corrigendum No 1 20 January 2003 Change to Annex ZA
4.1.2.1, 4.1.2.3, 4.2.1, 8.1.2, Annex A,
Annex B and Annex ZA
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Trang 3EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN 12334
January 2001
+ A1
August 2004
ICS 23.060.50 Incorporating corrigendum July 2002
English version Industrial valves — Cast iron check valves
(includes amendment A1:2004)
Robinetterie industrielle — Clapets de non-retour en fonte
(inclut l’amendement A1:2004)
Industriearmaturen — Rückflussverhinderer aus Gusseisen
(enthält Änderung A1:2004)
This European Standard was approved by CEN on 28 December 2000, and amendment A1 was approved by CEN on 27 May 2004 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 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 Management Centre has the same status as the official versions
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom
EUROPEAN COMMITTEE FOR STANDARDIZATION
C O M I T É E U R O P É E N D E N O R M A L I S A T I O N
E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members
Ref No EN 12334:2001 + A1:2004 E
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Contents
Page
Foreword 3
1 Scope 4
2 Normative references 4
3 Terms and definitions 5
4 Requirements 5
4.1 Design requirements 5
4.2 Functional characteristics 6
5 Test procedures 7
6 Declaration of compliance 7
7 Designation 7
8 Marking, preparation for storage and transportation .8
8.1 Marking 8
8.2 Preparation for storage and transportation 8
Annex A (informative) Information to be supplied by the purchaser 9
Annex B (normative) Comparison between EN and ISO cast iron material grades 10
Annex ZA (informative) Clauses of this European Standard addressing Essential requirements or other provisions of EU Directives 11
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EN 12334:2001
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Foreword
This European Standard 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 2001, and conflicting national standards shall be withdrawn at the latest by July 2001
This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s)
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom
Foreword to amendment A1
This document (EN 12334:2001/A1:2004) has been prepared by Technical Committee CEN/TC 69, Industrial valves, the Secretariat of which is held by AFNOR
This Amendment to the 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 February 2005, and conflicting national standards shall be withdrawn at the latest by February 2005
This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s)
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom
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1 Scope
This European Standard specifies the requirements for cast iron check valves
This standard applies to cast iron check valves mainly used for industrial and general purpose applications However, they may be used for other applications provided the requirements of the relevant performance standards are met
The range of nominal sizes covered is:
DN 10; DN 15; DN 20; DN 25; DN 32; DN 40; DN 50; DN 65; DN 80; DN 100; DN 125; DN 150;
DN 200; DN 250; DN 300; DN 350; DN 400; DN 450; DN 500; DN 600; DN 700; DN 800; DN 900;
DN 1000
The range of pressure designations covered is:
PN 2,5; PN 6; PN 10; PN 16; PN 25
NOTE: Back flow prevention anti-pollution check valves are outside the scope of this standard
2 Normative references
This European Standard incorporates by dated or undated reference provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revision to any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies (including amendments)
EN 558-1, Industrial valves — Face-to-face and centre-to-face dimensions of metal valves for use
in flanged pipe systems — Part 1: PN-designated valves
EN 736-1, Valves — Terminology — Part 1: Definitions of types of valves
EN 736-2, Valves — Terminology — Part 2: Definitions of components of valves
EN 736-3, Valves — Terminology — Part 3: Definitions of terms
EN 1092-2, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories,
PN designated — Part 2: Cast iron flanges
EN 1561, Founding — Grey cast irons
EN 1563, Founding — Spheroidal graphite cast irons
EN 12351, Industrial valves — Protective caps for valves with flanged connections
prEN 19:2000, Industrial valves — Marking of metallic valves
prEN 12266-1:1999, Industrial valves — Testing of valves — Part 1: Tests, test procedures and acceptance
criteria to be fulfilled by every valve
prEN 12266-2:1999, Industrial valves — Testing of valves — Part 2: Supplementary tests, test procedures
and acceptance criteria
prEN 12516-3:1999, Valves — Shell design strength — Part 3: Experimental Method
Part 1: Dimensions, tolerances and designation
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EN 12334:2001
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ISO 4200, Plain end steel tubes, welded and seamless — General tables of dimensions and
masses per unit length
3 Terms and definitions
For the purposes of this standard the terms and definitions of types of valves and components and the terms and definitions given in EN 736-1, EN 736-2 and EN 736-3 apply
4 Requirements
4.1 Design requirements
4.1.1 Materials
4.1.1.1 The body and cover (if any) materials shall be selected from Table 1 The limits of use given in the material standard shall be taken into account See 4.1.2.1 and 4.2.1
Table 1 — Body and Cover Materials
Designation
1561
200a
250
EN-GJL-200 EN-GJL-250
EN-JL1030 EN-JL1040
Spheroidal graphite
cast iron
1563
1563
1563
1563
1563
1563
1563
350
350
400
400
400
500
600
EN-GJS-350-22-LT EN-GJS-350-22-RT EN-GJS-400-18-LT EN-GJS-400-18-RT EN-GJS-400-15 EN-GJS-500-7 EN-GJS-600-3
EN-JS1015 EN-JS1014 EN-JS1025 EN-JS1024 EN-JS1030 EN-JS1050 EN-JS1060
a
Grade 200 shall not be used for valves with PN 25 flanged end connections
4.1.1.2 The manufacturer shall declare the materials of construction and any coatings of components in contact with the line fluid from which the suitability of the valve for the application can be determined
4.1.1.3 Welding of grey cast iron and impregnation of castings of all materials is not permitted
4.1.2 Pressure/temperature ratings
4.1.2.1 The pressure/temperature ratings shall be in accordance with EN 1092-2 for the equivalent ISO material grade and are not for conditions of hydraulic or external shock likely to cause brittle fracture
Annex B should be used to determine the equivalent ISO material grade for the EN material grades specified
in Table 1
4.1.2.2 Any restrictions of temperature and pressure below those specified in EN 1092-2, for example, those imposed by soft seals, special trims, shall be indicated on the valve (see 8.1.2)
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4.1.2.3 The use of valves at lower temperatures than shown in the pressure/temperature rating tables in
EN 1092-2 is permitted providing that the body, bonnet and cover is manufactured from spheroidal graphite cast iron material grades EN-GJS-350-22-LT or EN-GJS-400-18-LT For temperatures below the lowest temperature shown in the rating tables the maximum allowable pressure shall be no greater than the pressure corresponding to the lowest temperature in the rating tables The lowest scheduled operating temperature shall not be less than the temperature specified in EN 1563 for the Charpy impact tests
4.1.3 Dimensions
4.1.3.1 Face-to-face and centre-to-face dimensions
Face-to-face and centre-to-face dimensions for PN designated flanged end valves shall be in accordance with EN 558-1 and specified by the purchaser (see annex A) Face-to-face dimensions for valves other than flanged are the choice of the manufacturer
4.1.3.2 Body ends — flanged type
Flanged ends shall be in accordance with the requirements of EN 1092-2
4.1.3.3 Wafer type body
The body of wafer type valves shall have means to centralise its location within the flange bolting of the pipe end flanges with which the valve will be assembled
4.1.4 Operation
A check valve automatically opens by fluid flow in a defined direction and automatically closes to prevent fluid flow in the reverse direction Means may be provided to restrict the degree of opening and/or influence the speed of opening or closing Wafer type obturators shall be capable of operation when the valve is connected to pipework to ISO 4200 Depending on obturator type, valves operate in horizontal or vertical pipe, or both
4.1.5 Auxiliary connections
When auxiliary connections are required, they shall be specified by the purchaser and shall be of the internal form in accordance with Type Rc or Rp to ISO 7-1
4.2 Functional characteristics
4.2.1 Shell design strength
Design for adequate strength shall incorporate safety coefficients appropriate to the properties of the material to ensure sufficient ductility, toughness, corrosive and wear resistance Appropriate measures shall
be taken where less ductile material is used to avoid brittle fracture.The shell design strength shall be verified by a type test in accordance with EN 12516-3
4.2.2 Flow characteristics
Manufacturers shall give guidance in their literature in respect of recommended maximum and minimum flow velocities of liquids and/or gases
4.2.3 Seat leakage
The allowable rate for seat leakage tests specified in prEN 12266-1:1999 shall be:
a) for resilient seated valves, no visible leakage;
b) for metal seated valves, 2mm3/s × DN (expressed in millimetres)
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EN 12334:2001
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4.2.4 Anti-blow out design
The valve designs shall ensure that the shaft or stem of the obturator hinge mechanism cannot be fully blown out of the shell when the valve is under pressure
by disassembly of any external part; or
by failure of the connection between obturator and shaft or stem even when external parts are removed
5 Test procedures
5.1 Valves shall be pressure tested by the manufacturer prior to dispatch in accordance with
prEN 12266-1:1999
5.2 Additional tests of finished valves can also be carried out to the requirements of prEN 12266-2:1999
The customer shall specify which tests are required except that test F21 shall not be applied to cast iron check valves
6 Declaration of compliance
The manufacturer shall declare compliance with this standard by marking the valve with the number of this standard
7 Designation
Check valves in accordance with this standard shall be designated by the following elements in the same order:
check valve type (see EN 736-1);
EN 12334 ;
body type (flanged or wafer);
symbol DN and number;
pressure designation PN;
material of the body and cover (if any);
the face-to-face or centre-to-face dimensions basic series
EXAMPLE
A double disk check valve to EN 12334 in wafer pattern, DN 65, PN 16 in EN 1561-GJL-200 cast iron
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8 Marking, preparation for storage and transportation
8.1 Marking
8.1.1 Marking shall be in accordance with prEN 19:2000
For valves equal to or smaller than nominal size DN 50, where due to the physical size of the valve it is not practical to apply the mandatory markings as specified in prEN 19:2000, items 1, 2 and 4 may be omitted provided they are shown on the identification plate
The sequence of omissions shall be:
a) nominal size (item 1);
b) pressure designation (item 2);
c) manufacturer’s name or trademark (item 4)
8.1.2 The following supplementary markings shall be marked on the valve:
a) arrow for direction of flow (item 5);
b) standard number (item 11);
c) maximum allowable temperature TS (°C) (item 7) (4.1.2.2);
d) maximum allowable pressure PS (bar) (item 9) (4.1.2.2);
e) identification number (item 10) only if different from manufacturer’s name or trademark (item 4) (8.1.1c);
f) year of manufacture (item 18)
8.2 Preparation for storage and transportation
Each valve shall be drained of any test fluid The valve shall be packaged or the body ends covered to prevent the ingress of foreign matter In the case of polymeric or elastomeric seated valves the seating shall also be protected from ultra violet light
Protective caps for valves with flanged end connections shall be in accordance with EN 12351
The obturator of valves that can be damaged in transit shall be provided with some means of temporary restraint
Double disk check valves shall be prepared for transport in the closed position
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