Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings

1.1 This European standard specifies the general requirements for the construction, performance and safety of ball valves and closed bottom taper plug valves. It also details the test methods and marking requirements.
It applies to metallic valves for domestic and commercial not directly buried installations inside or outside of buildings, using gases of the first, second and third family (specified in EN 437) and working up to
0,2 105 Pa, 0,5 105 Pa, 1 x 105Pa. 5 105 Pa and 20 x 105Pa.
NOTE   "Not directly buried" within the context of this standard means that valves below ground are not in direct contact with earth or other materials e.g. that they are in a protected encasement.
1.2 Valve nominal sizes (DN) covered by this European standard are as follows: 6, 8, 10, 12, 15, 20, 25, 32, 40, 50.

Handbetätigte Kugelhähne und Kegelhähne mit geschlossenem Boden für die Gas-Hausinstallation

.1   Diese Europäische Norm legt die Eigenschaften/Kenngrößen für den Bau, die Funktion und Sicherheit von Kugelhähnen und Kegelhähnen mit geschlossenem Boden fest. Diese Norm beschreibt auch die Prüfverfahren und die Kennzeichnungsvorschriften ausführlich.
Sie gilt für metallische Armaturen in häuslichen und gewerblichen, nicht direkt erdverlegten Anlagen innerhalb oder außerhalb von Gebäuden für Drücke von 0,2 x 105 Pa, 0,5 x 105 Pa, 1 x 105 Pa, 5 x 105 Pa und 20x 105 Pa und mit Temperaturgrenzen von -5 °C oder -20 °C bis +60 °C unter Anwendung von Gasen der ersten, zweiten und dritten Familie (festgelegt in EN 437).
ANMERKUNG   Im Rahmen dieser Norm bedeutet "nicht direkt erdverlegt", dass unterirdisch verlegte Armaturen nicht in direktem Kontakt mit Erde oder anderen Materialien stehen, sondern sich in einem Schutzgehäuse befinden.
1.2   Die Nennweiten (DN) der Armaturen nach dieser Europäischen Norm sind: 6, 8, 10, 12, 15, 20, 25, 32, 40, 50, 65, 80, 100.

Robinets à tournant sphérique et robinets à tournant conique à fond plat destinés à être manoeuvrés manuellement et à être utilisés pour les installations de gaz dans les bâtiments

1.1   La présente Norme européenne définit les caractéristiques concernant la construction, les performances et la sécurité pour les robinets à tournant sphérique et les robinets à tournant conique à fond plat. Elle précise aussi les méthodes d’essai et les dispositions de marquage.
Elle s’applique aux robinets métalliques destinés aux installations domestiques et commerciales, non enterrés, qui sont situées à l’intérieur ou à l’extérieur des bâtiments, et qui sont alimentées avec les gaz des première, deuxième et troisième familles (telles que spécifiées dans l’EN 437) et fonctionnant sous des pressions allant jusqu’à 0,2 x 105 Pa, 0,5 x 105 Pa, 1 x 105 Pa, 5 x 105 Pa et 20 x 105 Pa, avec des limites de température comprises entre -5 °C ou -20 °C et + 60 °C.
NOTE   Dans le cadre de l’application de la présente norme le terme « non enterrées » signifie que les robinets sous-terrain ne sont pas en contact direct avec la terre ou d’autres matériaux, par exemple ils sont protégés par un coffret.
1.2   Les diamètres nominaux (DN) des robinets couverts par cette Norme européenne sont les suivants : 6, 8, 10, 12, 15, 20, 25, 32, 40, 50, 65, 80, 100.

Ročne krogelne pipe in zasuni za plinske napeljave v stavbah

1.1 Ta evropski standard določa splošne zahteve za izdelavo, delovanje in varnost varnostnih krogelnih pip in zasunov. Poleg tega podrobno določa preskusne metode in zahteve za označevanje.
Velja za kovinske pipe, ki se uporabljajo v domačih in komercialnih napravah, ki niso neposredno vkopane v zemljo, uporabljajo pline prve, druge in tretje družine (določene v EN 437) ter delujejo pri tlakih do 0,2 05 Pa, 0,5 05 Pa, 1 x 105 Pa. 5 05 Pa in 20 x 105Pa.
OPOMBA: »Niso neposredno vkopane pod zemljo« v okviru tega standarda pomeni, da podzemne pipe niso v neposrednem stiku z zemljo ali drugimi materiali npr. da so v zaščitnem ohišju.
1.2 Nazivne velikosti pip (DN), ki so zajete v tem evropskem standardu so naslednje: 6, 8, 10, 12, 15, 20, 25, 32, 40, 50.

General Information

Status
Published
Public Enquiry End Date
31-Aug-2013
Publication Date
27-Jan-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jan-2016
Due Date
13-Mar-2016
Completion Date
28-Jan-2016

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Handbetätigte Kugelhähne und Kegelhähne mit geschlossenem Boden für die Gas-HausinstallationRobinets à tournant sphérique et robinets à tournant conique à fond plat destinés à être manoeuvrés manuellement et à être utilisés pour les installations de gaz dans les bâtimentsManually operated ball valves and closed bottom taper plug valves for gas installations for buildings91.140.40Sistemi za oskrbo s plinomGas supply systems23.060.20Zapirni ventili (kroglasti in pipe)Ball and plug valvesICS:Ta slovenski standard je istoveten z:EN 331:2015SIST EN 331:2016en,fr,de01-marec-2016SIST EN 331:2016SLOVENSKI

STANDARDSIST EN 331:2000/A1:2011SIST EN 331:20001DGRPHãþD
SIST EN 331:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 331
December
t r s w ICS
t uä r x rä t r Supersedes EN
u u sã s { { zEnglish Version

Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings Robinets à tournant sphérique et robinets à tournant conique à fond plat destinés à être manoeuvrés manuellement et à être utilisés pour les installations de gaz dans les bâtiments

Handbetätigte Kugelhähne und Kegelhähne mit geschlossenem Boden für die GasæHausinstallation This European Standard was approved by CEN on

t v October
t r s wä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

u u sã t r s w ESIST EN 331:2016

EN 331:2015 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 5 3 Terms, definitions, symbols, units and abbreviated terms ............................................................. 7 4 Product characteristics ................................................................................................................................. 9 4.1 Reaction to fire ................................................................................................................................................. 9 4.2 Dimensions and tolerance ........................................................................................................................... 9 4.2.1 Materials ............................................................................................................................................................. 9 4.2.2 Construction ................................................................................................................................................... 11 4.2.3 Product appearance .................................................................................................................................... 11 4.2.4 Valve maintenance ...................................................................................................................................... 11 4.2.5 Springs ............................................................................................................................................................. 11 4.2.6 Wall thickness ............................................................................................................................................... 11 4.2.7 Plug valves ...................................................................................................................................................... 11 4.2.8 Angular seal .................................................................................................................................................... 11 4.2.9 Seals .................................................................................................................................................................. 12 4.2.10 Operation ........................................................................................................................................................ 12 4.2.11 Stops .................................................................................................................................................................. 13 4.2.12 Joints ................................................................................................................................................................. 13 4.3 Classification of relevant characteristics ............................................................................................ 14 4.3.1 Pressure classes ............................................................................................................................................ 14 4.3.2 Temperature classes ................................................................................................................................... 14 4.3.3 High temperature resistance classes .................................................................................................... 14 4.4 Tightness (gas): leak tightness ................................................................................................................ 15 4.5 Effectiveness: rated flow rate .................................................................................................................. 15 4.6 Resistance to high temperature .............................................................................................................. 16 4.7 Mechanical strength for gas networks ................................................................................................. 16 4.7.1 Operating torque .......................................................................................................................................... 16 4.7.2 Torque and bending mechanical strength .......................................................................................... 16 4.8 Safeguard against overloading of the handle – Stop resistance .................................................. 17 4.9 Release of dangerous substances ........................................................................................................... 17 4.10 Performance requirements ...................................................................................................................... 18 4.10.1 General ............................................................................................................................................................. 18 4.10.2 Durability ........................................................................................................................................................ 18 5 Testing, assessment and sampling methods ...................................................................................... 18 5.1 General ............................................................................................................................................................. 18 5.1.1 Test conditions .............................................................................................................................................. 18 5.1.2 Test sequence ................................................................................................................................................ 18 5.2 Internal pressure and leak-tightness ................................................................................................... 18 5.2.1 General ............................................................................................................................................................. 18 5.2.2 Pressure test values .................................................................................................................................... 19 5.2.3 Closure parts, external leak-tightness .................................................................................................. 19 5.2.4 Internal leak-tightness ............................................................................................................................... 19 5.3 Rated flow rate .............................................................................................................................................. 19 5.3.1 Apparatus ........................................................................................................................................................ 19 SIST EN 331:2016

EN 331:2015 (E) 3 5.3.2 Procedure ........................................................................................................................................................ 21 5.4 Operating torque .......................................................................................................................................... 21 5.5 Torque and bending mechanical strength ........................................................................................... 21 5.5.1 General ............................................................................................................................................................. 21 5.5.2 Sequence of torsion and bending moment tests for valves ........................................................... 21 5.6 Durability......................................................................................................................................................... 23 5.6.1 Endurance test ............................................................................................................................................... 23 5.6.2 Resistance to low temperature ................................................................................................................ 23 5.6.3 Salt spray resistance .................................................................................................................................... 23 5.7 Angular seal .................................................................................................................................................... 24 5.8 Safeguard against overloading of the handle – Stop resistance ................................................... 24 6 Assessment and verification of constancy of performance - AVCP ............................................. 24 6.1 General ............................................................................................................................................................. 24 6.2 Type testing .................................................................................................................................................... 24 6.2.1 General ............................................................................................................................................................. 24 6.2.2 Test samples, testing and compliance criteria ................................................................................... 25 6.2.3 Test reports .................................................................................................................................................... 26 6.2.4 Shared other party results ........................................................................................................................ 27 6.3 Factory production control (FPC) ........................................................................................................... 27 6.3.1 General ............................................................................................................................................................. 27 6.3.2 Requirements ................................................................................................................................................. 28 6.3.3 Product specific requirements ................................................................................................................ 30 6.3.4 Initial inspection of factory and FPC ...................................................................................................... 31 6.3.5 Continuous surveillance of FPC ............................................................................................................... 31 6.3.6 Procedure for modifications ..................................................................................................................... 31 7 Marking, labelling, instructions and packaging ................................................................................ 32 7.1 Marking and labelling ................................................................................................................................. 32 7.2 Instructions for installation and operation ........................................................................................ 32 7.3 Packaging ......................................................................................................................................................... 33 Annex A (normative)

Resistance to high temperatures for valves classes B and C ........................... 34 A.1 General ............................................................................................................................................................. 34 A.2 Procedure (external leakage) .................................................................................................................. 34 A.2.1 Test criteria .................................................................................................................................................... 34 A.2.2 Test method .................................................................................................................................................... 34 A.2.2.1 Apparatus ........................................................................................................................................................ 34 A.2.2.2 Test procedure .............................................................................................................................................. 35 Annex ZA (informative)

Clauses of this European Standard addressing the provisions of the EU Construction Products Regulation ................................................................................................... 37 ZA.1 Scope and relevant characteristics ........................................................................................................ 37 ZA.2 Procedure for AVCP of manually operated ball valves and closed bottom taper plug valves for gas installations for buildings ............................................................................................. 39 ZA.3 CE marking and labelling ........................................................................................................................... 41 Bibliography ................................................................................................................................................................. 45

SIST EN 331:2016

EN 331:2015 (E) 4 European foreword This document (EN 331:2015) has been prepared by Technical Committee CEN/TC 236 “Non industrial manually operated shut-off valves for gas and particular combinations valves-other products”, the secretariat of which is held by UNI. 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 June 2016, and conflicting national standards shall be withdrawn at the latest by September 2017. 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. This document supersedes EN 331:1998. The revised version: —

includes in one document the previous publications of 1998 and 2010 to allow an easier reading of the text; —

allocates the clauses and the annexes in line with the framework of the standards which support CPR; —

enlarges the field of application to the nominal sizes DN 65, 80 and 100; —

updates the technical content in line with the current edition of the referenced standards; —

considers the proposals coming from the experience of the application of the previous edition of EN 331; —

adds Annex ZA for the relationship between this European Standard and the Essential Requirements of EN Construction Products Regulation. 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). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 331:2016

EN 331:2015 (E) 5 1 Scope 1.1 This European Standard specifies the characteristics for the construction, performance and safety of ball valves and closed bottom taper plug valves. It also details the test methods and marking provisions. It applies to metallic valves not directly buried for domestic and commercial installations inside or outside of buildings, using gases of the first, second and third family (specified in EN 437) and working up to 0,2 × 105 Pa, 0,5 × 105 Pa, 1 × 105Pa, 5 × 105 Pa and 20 × 105Pa and with temperature limits from – 5 °C or

«20 °C to + 60 °C. NOTE “Not directly buried” within the context of this standard means that valves below ground are not in direct contact with earth or other materials e.g. that they are in a protected encasement. 1.2 Valve nominal sizes (DN) covered by this European Standard are as follows: 6, 8, 10, 12, 15, 20, 25, 32, 40, 50, 65, 80, 100. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 377, Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in industrial processes EN 437:2003+A1:2009, Test gases - Test pressures - Appliance categories EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment EN 682, Elastomeric Seals - Materials requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids EN 751-1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 1: Anaerobic jointing compounds EN 751-2, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges EN 1092-2, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 2: Cast iron flanges EN 1092-3, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 3: Copper alloy flanges EN 1254-1, Copper and copper alloys - Plumbing fittings - Part 1: Fittings with ends for capillary soldering or capillary brazing to copper tubes EN 1254-2, Copper and copper alloys - Plumbing fittings - Part 2: Fittings with compression ends for use with copper tubes SIST EN 331:2016

EN 331:2015 (E) 6 EN 1254-8, Copper and copper alloys - Plumbing fittings - Part 8: Fittings with press ends for use with plastics and multilayer pipes EN 1412, Copper and copper alloys - European numbering system EN 1503-1, Valves — Materials for bodies, bonnets and covers — Part 1: Steels specified in European Standards EN 1503-3, Valves — Materials for bodies, bonnets and covers — Part 3: Cast irons specified in European Standards EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings EN 1593:1999, Non-destructive testing - Leak testing - Bubble emission techniques EN 1982 Copper and copper alloys - Ingots and castings EN 10226 (all parts), Pipe threads where pressure tight joints are made on the threads EN 10255, Non-Alloy steel tubes suitable for welding and threading — Technical delivery conditions EN 12163 Copper and copper alloys - Rod for general purposes EN 12164 Copper and copper alloys - Rod for free machining purposes EN 12165 Copper and copper alloys - Wrought and unwrought forging stock EN 12167 Copper and copper alloys - Profiles and bars for general purposes EN 12168 Copper and copper alloys - Hollow rod for free machining purposes EN 12420 Copper and copper alloys - Forgings EN 12627, Industrial valves - Butt welding ends for steel valves EN 60730-1:2000, Automatic electrical controls for household and similar use - Part 1: General requirements (IEC 60730-1:1999, modified) EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1) EN ISO 9227, Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227) ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1 ISO 261, ISO general purpose metric screw threads — General plan ISO 17885, Plastics piping systems -- Mechanical fittings for pressure piping systems -- Specifications SIST EN 331:2016

EN 331:2015 (E) 7 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 standard reference conditions conditions to which all measured values are corrected (temperature 15 °C; pressure 1013,25 × 102 Pa absolute; dry air) 3.2 shut off valve device which admits or closes the gas flow by movement of the closure member. A valve is manually operated if operation can be performed by the user 3.3 components 3.3.1 obturator movable part of the valve which shuts off the gas flow 3.3.2 actuating mechanism part of the valve which actuates the obturator 3.3.3 manual actuator manually operated actuating mechanism 3.3.4 gas way passage in the valve through which the gas flows 3.3.5 joint means of connecting elements of a gas installation [SOURCE: EN 1775:2007] 3.3.6 flexible appliance connector element of flexible pipework to be fitted between the end of fixed pipework and the appliance inlet connection [SOURCE: EN 1775:2007] 3.4 leak-tightness 3.4.1 external leak-tightness leak-tightness of a gas-carrying compartment with respect to atmosphere 3.4.2 internal leak-tightness leak-tightness between the inlet and outlet of the valve with the obturator in the closed position SIST EN 331:2016

EN 331:2015 (E) 8 3.5 pressures pressures measured under static conditions. All pressures quoted are relative to atmospheric pressure 3.5.1 inlet pressure pressure at the inlet of the valve 3.5.2 outlet pressure pressure at the outlet of the valve 3.5.3 maximum operating pressure (MOP) maximum pressure at which a valve can be operated continuously under normal operating conditions 3.5.4 test pressure pressure to be applied during the test 3.5.5 pressure difference difference between inlet and outlet pressures 3.6 rated flow rate flow rate of air, under standard reference conditions, at a given pressure drop 3.7 temperatures 3.7.1 ambient temperature temperature of the medium surrounding the gas valve 3.7.2 maximum operating temperature (MOT) maximum temperature at which a valve can be operated continuously under normal conditions 3.7.3 minimum operating temperature lowest temperature ( « Note 1 to entry: Temperatures lower than

« t r °C can be declared by the manufacturers. 3.8 operating torque 3.8.1 opening torque torque to be applied to the manual actuator to move the obturator from the closed to the open position 3.8.2 closing torque torque to be applied to the manual actuator to move the obturator from the open to the closed position SIST EN 331:2016

EN 331:2015 (E) 9 3.9 cycling frequency number of working cycles, i.e. from the closed position to the openposition and back to the closed position, in unit time 3.10 DN (nominal size) alphanumeric designation of size for components of a pipework system, which is used for reference purposes. It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections [SOURCE: EN ISO 6708:1995] 4 Product characteristics 4.1 Reaction to fire Manually operated ball valves and closed bottom taper plug valves in compliance with this standard are classified as belonging to Class A1 “No contribution to fire”. 4.2 Dimensions and tolerance 4.2.1 Materials 4.2.1.1 The shell, obturator and stem shall be made in one of the following materials: a) copper alloy excluding aluminium-bronze in accordance with Table 1; b) ductile cast iron excluding laminar cast iron in accordance with EN 1503-3; c) forged steel and cast steel in accordance with EN 1503-1. Any part in contact with the gas or the surrounding atmosphere, shall be manufactured from corrosion-resistant materials or shall comply with salt spray test (see 5.6.3). See Table 1 for a list of suitable copper-alloy materials. SIST EN 331:2016

EN 331:2015 (E) 10 Table 1 — Type of suitable copper-alloy materials Material Reference standards

Choice of the standard following the material processing Symbol Number (According to EN 1412) Turning Stamping

Forging Casting CuZn37 CW508L EN 12167 EN 12163 EN 12420
EN 12165
CuZn40 CW509L EN 12167
EN 12163 EN 12420
EN 12165
CuZn36Pb3 CW603N EN 12167
EN 12164
EN 12168
CuZn37Pb1 CW605N EN 12168
CuZn37Pb2 CW606N EN 12167
EN 12164
EN 12168
CuZn39Pb0,5 CW610N EN 12164
EN 12167 EN 12165
EN 12420
CuZn39Pb1 CW611N EN 12164 EN 12167 EN 12168 EN 12165
EN 12420
CuZn39Pb2 CW612N EN 12164 EN 12167 EN 12168 EN 12165
EN 12420
CuZn39Pb3 CW614N EN 12164
EN 12167
EN 12168 EN 12165
EN 12420
CuZn40Pb2 CW617N EN 12164
EN 12167
EN 12168 EN 12165
EN 12420
CuZn39Pb1AlB-C CC755S
EN 1982 CuZn38Al-C CC767S
EN 1982 CuSn10-C CC480K
EN 1982 CuSn5Zn5Pb5-C CC491K
EN 1982 CuSn3Zn8Pb5-C CC490K

EN 1982 NOTE Materials of equal or better chemical and mechanical characteristics can be accepted. The corrosion protection for springs and other moving parts shall not be impaired by any movement. 4.2.1.2 Material indicated in 4.2.1.1 b) and c), excluding a), shall be tested in accordance with 5.6.3 (salt spray resistance). SIST EN 331:2016

EN 331:2015 (E) 11 Once the test has been run, no corrosion which could impair the device's operation shall be revealed by visual examination (disregarding possible salt deposits), and the external tightness of the device (connected and disconnected) remains in conformity with the requirement defined in 4.4 (leak-tightness). 4.2.1.3 Springs and other moving parts manufactured from non-corrosion-resistant materials shall be protected against corrosion and shall retain their protective coating despite any movement resulting from the operation of the valve. After the test of 5.6.1 these parts shall withstand the test of 5.6.3. 4.2.1.4 Elastomeric sealing materials shall comply with EN 549 or EN 682. Additionally the temperature range of the materials specified in technical data sheet shall cover the valve temperature classes of Table 3 of this standard. 4.2.1.5 Lubricants shall comply with EN 377. Additionally the temperature range of the lubricant specified in technical data sheet shall cover the valve temperature classes of Table 3 of this standard. 4.2.1.6 Anaerobic jointing compounds shall comply with EN 751-1. 4.2.2 Construction Valves shall be designed such that, once installed, it is impossible to remove the obturator or a seal without damaging the valve or leaving clear signs of tampering on it. 4.2.3 Product appearance All valve components, when viewed with the naked eye corrected for norma

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