District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made steel valve assembly for steel service pipes, polyurethane thermal insulation and a casing of polyethylene

This document specifies requirements and test methods for factory made thermally insulated bonded valve assemblies for hot water networks in accordance with prEN 13941-1, comprising a steel valve, rigid polyurethane foam insulation and a casing of polyethylene.
The valve assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers.

Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt erdverlegte Fernwärmenetze - Vorgedämmte Absperrarmaturen für Stahlmediumrohre mit Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen

Dieses Dokument legt die Anforderungen und Prüfverfahren für werkmäßig vorgedämmte Verbundmantel-Absperrarmaturen mit Stahlarmaturen, Polyurethan-Hartschaumstoffwärmedämmung und Polyethylen-ummantelung für Fernwärmenetze nach EN 13941-1 fest.
Die Absperrarmatur könnte außerdem die folgenden zusätzlichen Elemente umfassen: Messdrähte, Abstandshalter und Diffusionsbarrieren.

Tuyaux de chauffage urbain - Systèmes bloqués monotubes pour les réseaux d'eau chaude enterrés directement - Assemblages d'appareils de robinetterie manufacturés pour tubes de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthylène

Le présent document spécifie les exigences et les méthodes d’essai des assemblages d’appareils de robinetterie bloqués manufacturés isolés thermiquement pour les réseaux d’eau chaude, conformes au prEN 13941-1, comprenant un appareil de robinetterie en acier, une isolation en mousse rigide de polyuréthane et un tube de protection en polyéthylène.
L’assemblage d’appareils de robinetterie peut également comprendre les éléments supplémentaires suivants : câbles de mesure, entretoises et barrières anti-diffusion.

Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana vročevodna omrežja - Tovarniško izdelan sestav jeklenih ventilov za jeklene delovne cevi, obdane s poliuretansko toplotno izolacijo in zaščitnim plaščem iz polietilena

Ta dokument določa zahteve in preskusne metode za tovarniško izdelane toplotno izolirane sestave povitih ventilov za vročevodna omrežja v skladu s standardom prEN 13941-1, ki so sestavljeni iz jeklenih ventilov, trde poliuretanske izolacijske pene in polietilenskega plašča.
Sestav ventilov lahko vključuje tudi naslednje dodatne elemente: merilne žice, distančnike in difuzijske pregrade.

General Information

Status
Published
Public Enquiry End Date
31-Mar-2018
Publication Date
04-Nov-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
24-Oct-2019
Due Date
29-Dec-2019
Completion Date
05-Nov-2019

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SLOVENSKI STANDARD
SIST EN 488:2020
01-januar-2020
Nadomešča:
SIST EN 488:2016
Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana
vročevodna omrežja - Tovarniško izdelan sestav jeklenih ventilov za jeklene
delovne cevi, obdane s poliuretansko toplotno izolacijo in zaščitnim plaščem iz
polietilena

District heating pipes - Bonded single pipe systems for directly buried hot water networks

- Factory made steel valve assembly for steel service pipes, polyurethane thermal

insulation and a casing of polyethylene
Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt
erdverlegte Fernwärmenetze - Vorgedämmte Absperrarmaturen für Stahlmediumrohre
mit Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués monotubes pour les réseaux d'eau

chaude enterrés directement - Assemblages d'appareils de robinetterie manufacturés

pour tubes de service en acier, isolation thermique en polyuréthane et tube de protection

en polyéthylène
Ta slovenski standard je istoveten z: EN 488:2019
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.060.01 Ventili na splošno Valves in general
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 488:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 488:2020
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SIST EN 488:2020
EN 488
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 23.060.01 Supersedes EN 488:2015
English Version
District heating pipes - Bonded single pipe systems for
directly buried hot water networks - Factory made steel
valve assembly for steel service pipes, polyurethane
thermal insulation and a casing of polyethylene

Tuyaux de chauffage urbain - Systèmes bloqués Fernwärmerohre - Werkmäßig gedämmte

monotubes pour les réseaux d'eau chaude enterrés Verbundmantelrohrsysteme für direkt erdverlegte

directement - Assemblages d'appareils de robinetterie Fernwärmenetze - Vorgedämmte Absperrarmaturen

manufacturés pour tubes de service en acier, isolation für Stahlmediumrohre mit Polyurethan-

thermique en polyuréthane et tube de protection en Wärmedämmung und Außenmantel aus Polyethylen

polyéthylène
This European Standard was approved by CEN on 12 August 2019.

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-CENELEC 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-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 488:2019 E

worldwide for CEN national Members.
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SIST EN 488:2020
EN 488:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Requirements ................................................................................................................................................... 6

5 Testing, test methods and test requirements .................................................................................... 10

6 Marking ............................................................................................................................................................ 15

7 Installation and maintenance .................................................................................................................. 16

Annex A (informative) Guidelines for inspection and testing ..................................................................... 17

Annex B (normative) Resistance to axial force and bending moment ..................................................... 19

Annex C (normative) Resistance to bending forces ........................................................................................ 21

Annex D (informative) Waste treatment and recycling ................................................................................ 25

Bibliography ................................................................................................................................................................. 26

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SIST EN 488:2020
EN 488:2019 (E)
European foreword

This document (EN 488:2019) has been prepared by Technical Committee CEN/TC 107 “Prefabricated

district heating and district cooling pipe system”, the secretariat of which is held by DS.

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 April 2020, and conflicting national standards shall be

withdrawn at the latest by April 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 488:2015.

In comparison with the previous edition, the main changes in this new edition of EN 488 are:

— editorial changes to the new structure of standards prepared by the Technical Committee

CEN/TC 107.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
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SIST EN 488:2020
EN 488:2019 (E)
Introduction
EN 488 has also been aligned with EN 448 and other relevant European Standards.
Other standards from CEN/TC 107 are:

— EN 253, District heating pipes — Bonded single pipe systems for directly buried hot water networks —

Factory made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of

polyethylene;

— EN 448, District heating pipes — Bonded single pipe systems for directly buried hot water networks —

Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of

polyethylene;

— EN 489-1, District heating pipes — Bonded single and twin pipe systems for buried hot water

networks — Part 1: Joint casing assemblies and thermal insulation for hot water networks in

accordance with EN 13941-1;

— EN 13941-1, District heating pipes — Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried hot water networks — Part 1: Design;

— EN 13941-2, District heating pipes — Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried hot water networks — Part 2: Installation;

— EN 14419, District heating pipes — Bonded single and twin pipe systems for directly buried hot water

networks — Surveillance systems;

— EN 15632 (all parts), District heating pipes — Pre-insulated flexible pipe systems;

— EN 15698-1, District heating pipes — Bonded twin pipe systems for directly buried hot water

networks — Part 1: Factory made twin pipe assembly of steel service pipes, polyurethane thermal

insulation and one casing of polyethylene ;

— EN 15698-2, District heating pipes — Bonded twin pipe systems for directly buried hot water

networks — Part 2: Factory made fitting and valve assemblies of steel service pipes, polyurethane

thermal insulation and one casing of polyethylene

— EN 17248, District heating and district cooling pipe systems — Terms and definitions.

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SIST EN 488:2020
EN 488:2019 (E)
1 Scope

This document specifies requirements and test methods for factory made thermally insulated bonded

valve assemblies for hot water networks in accordance with EN 13941-1, comprising a steel valve, rigid

polyurethane foam thermal insulation and a casing of polyethylene.

The valve assembly could also include the following additional elements: measuring wires, spacers and

diffusion barriers.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 19, Industrial valves — Marking of metallic valves

EN 253, District heating pipes — Bonded single pipe systems for directly buried hot water networks —

Factory made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of

polyethylene

EN 448, District heating pipes — Bonded single pipe systems for directly buried hot water networks —

Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of

polyethylene
EN 736-1, Valves — Terminology — Part 1: Definition of types of valves
EN 10088-1:2014, Stainless steels — Part 1: List of stainless steels
EN 10204, Metallic products — Types of inspection documents

EN 12266-1, Industrial valves — Testing of metallic valves — Part 1: Pressure tests, test procedures and

acceptance criteria — Mandatory requirements

EN 13941-1, District heating pipes — Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried hot water networks — Part 1: Design

EN 13941-2, District heating pipes — Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried hot water networks — Part 2: Installation

EN 14419, District heating pipes — Bonded single and twin pipe systems for directly buried hot water

networks — Surveillance systems

EN 17248, District heating and district cooling pipe systems — Terms and definitions

EN ISO 12944-2, Paints and varnishes — Corrosion protection of steel structures by protective paint

systems — Part 2: Classification of environments (ISO 12944-2)

EN ISO 12944-5, Paints and varnishes — Corrosion protection of steel structures by protective paint

systems — Part 5: Protective paint systems (ISO 12944-5)
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SIST EN 488:2020
EN 488:2019 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 736-1 and EN 17248 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Requirements
4.1 Pressure ratings for valves
4.1.1 General

The valves shall be designed for use in pipe systems with a maximum operating pressure of 1,6 MPa or

2,5 MPa.

The valves shall be able to withstand a strength test pressure of the district heating system of 1,3

times the maximum operating pressure at ambient temperature in open and closed position.

4.1.2 Valves without indicated flow direction

Valves without an indicated flow direction shall support the pressure load in both directions.

4.2 Service temperatures for valves

The valves shall be able to withstand continuous operation with hot water at various temperatures in

accordance with EN 13941-1 and at a minimum water temperature of 4 °C.
4.3 Steel parts
4.3.1 General
Steel grades are specified in EN 13941-1.

All valves, steel pipes and steel components used for manufacturing of valve assemblies under the scope

of this document shall as a minimum be delivered to the manufacturer with an inspection certificate 3.1

according to EN 10204. The inspection certificate shall on request be passed on to the customer.

In case a material related inspection certificate 3.1 according to EN 10204 is required by the customer

who orders the factory made valve assemblies, this information shall be given while placing the order

with the manufacturer of the factory made valve assemblies.

Any later request for provision of such documentation can be too late and can possibly not be met by

the manufacturer, since the manufacturer shall organize the assignment of 3.1 certificates to valves and

valve assemblies before starting the production.
4.3.2 Valve

The valve shall be fully welded. Detachable joints, such as flanged or screwed connections, except

sealing system at the stem, shall not be used in the pressurized area.
4.3.3 Valve extension pipe

The quality of the valve body shall match with the quality of the valve extension pipe.

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SIST EN 488:2020
EN 488:2019 (E)
4.3.4 Welding ends

The welding ends of the valve assembly shall match with the service pipe in accordance with

EN 13941-2.
Pipe ends shall be prepared in accordance with EN 448.
4.3.5 Welding of steel parts

Fusion welding between valves and valve extension pipe, shall be carried out in accordance with

EN 448

The quality of the steel at the welding ends of the valve or valve assembly shall match with steel of the

service pipes.
Welding of pressurized parts of the valve assembly shall comply with EN 448.
4.4 Casing
4.4.1 General
The casing shall be in accordance with EN 448 and EN 253.
4.4.2 Requirements for polyethylene welding

The general requirements for polyethylene welding shall be in accordance with EN 448.

4.4.3 Diameter and wall thickness of the casing

The outside diameter and the minimum wall thickness of the casing shall be in accordance with EN 253.

4.5 Polyurethane (PUR) foam thermal insulation
4.5.1 General

The requirements for thermal insulation shall be the same as in EN 253 when tested in accordance with

5.5 of this document.
4.5.2 Minimum thickness of thermal insulation
The minimum thickness of thermal insulation shall be in accordance with EN 448.
4.6 Valve assembly
4.6.1 Ends of valve assembly
4.6.1.1 General

The ends of the valve extension pipe of the valve assembly shall be prepared for welding according to

4.3.3 and shall be free from thermal insulation in accordance with EN 253.
4.6.1.2 Centre line deviation

The distance between the centre lines of the valve extension pipe and the casing at the ends of the valve

assembly shall not exceed the limits given in EN 253.

The centre line deviation shall be measured between the centre lines with the largest deviation.

4.6.1.3 Angular deviation

The angular deviation between the centre lines of the not insulated ends of the valve extension pipe at

the length of 100 mm from the ends shall not exceed 2°.
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SIST EN 488:2020
EN 488:2019 (E)

The angular deviation shall be measured between the centre lines with the largest deviation.

4.6.2 End of stem construction

To ensure a long service life of the end stem passing through the casing, it shall withstand the

aggressive underground condition such as heat, cold, moisture, ground and salty water. Where the stem

construction passes the casing there shall be an arrangement to protect against water ingress to the

thermal insulation.
The stem construction outside the thermal insulation shall be:

— made from stainless steel as defined in EN 10088-1:2014, 3.1, however minimum specified Cr-

content is 16 %. Factors influencing the corrosion probability of the stainless steel construction can

be assessed according to EN 12502-4.

Specifically used steel type is documented by appropriate quality management system;

Under specific installation and operation conditions a chrome content of 16 % alone might not be

sufficient, so that other alloy elements are then recommended.

— or made from carbon steel and protected by a paint system securing durability range “high”

according to EN ISO 12944-5. Underground installed valves shall be suitable for corrosivity

categories of Im1, Im2 and Im3 according to EN ISO 12944-2 and for atmospheric-corrosivity

categories C5-M and C5-I according to EN ISO 12944-2.

Specifically used paint system shall be according to EN ISO 12944-5 and documented by

appropriate quality management system.

The protection by corrosion resistant material or corrosion protecting paint shall be added at the length

of at least 100 mm from the top of the ‘stem house’ (see Figure 1).
Key
L Length
H High offset
Figure 1 — Anti corrosion protection of the stem construction
4.6.3 Main dimensions of the valve assembly
The main dimensions of the valve assembly H and L are shown in Figure 2.

The values of the main dimensions “L” and “H” shall be declared by the manufacturer.

The tolerances of the valve assembly dimensions shown in Figure 2 shall be in accordance with Table 1.

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SIST EN 488:2020
EN 488:2019 (E)
Table 1 — Tolerances on the main valve dimensions
DN H L
mm mm
≤ 300 ±5 ±20
> 300 ±10 ±50
Figure 2 — Main dimensions
4.6.4 Installation of measuring elements

Measuring elements for surveillance systems shall be in accordance with EN 14419.

4.7 Requirements for effective operation and maintenance

The design of the valve shall make it possible to operate the valve outside the thermal insulation and

the casing.
The valve shall close when turned clockwise and open when turned anti-clockwise.

The stem construction shall make it possible to manoeuvre the valve by means of a T key from ground

level.

NOTE 1 Commonly used keyways are 19 mm, 27 mm, 36 mm, 50 mm and 60 mm or conical quadrangle

27 mm/ 32 mm.

Butterfly valves with nominal diameter DN 100 and larger, ball valves and gate valves with nominal

diameter DN 200 and larger shall be provided with a gear or a connection for an actuator to ensure

controlled manoeuvring of the valve.

NOTE 2 Commonly used keyways for connections for actuators are 60 mm, 70 mm and 90 mm, or conical

quadrangle 27 mm/32 mm.

Valves shall be provided with a stop device that can be replaced without removing the thermal

insulation and the casing. Alternatively, an internal stop device can be used. The internal stop device

shall be designed to resist a maximum strength torque of at least twice the maximum operating torque

specified by the manufacturer with a minimum of 150 Nm in the fully open and fully closed position of

the valve. Using an internal stop device, the valve stem shall be designed to resist a maximum strength

torque of at least 1,5 times the designed strength torque of the stop device.

The sealing around the stem shall be capable of being maintained without removing the thermal

insulation and the casing.
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SIST EN 488:2020
EN 488:2019 (E)
4.8 Resistance to axial forces and bending moments

The resistance of the valves to axial forces and bending moments shall comply with Table B.1.

5 Testing, test methods and test requirements
5.1 General

This clause specifies test methods, test sequence, test conditions and required test results for type and

production testing.

Where test requirements specified in this document differ from those in other standards referred to, the

requirements described in this document shall apply.
NOTE Informative Annex A of this d gives guidelines for inspection and testing.
5.2 Test specimens
5.2.1 General
Test specimens shall be representative for the production.
5.2.2 Test specimens for type testing steel parts of valve

The tests for axial forces, bending moments and torque are type tests for a range of valves with the

same construction principle, design and materials.

To qualify a whole product range with the same construction principle, design and materials, two valve

sizes within this product range shall be tested. The qualification shall be valid from half the size of the

smaller valve (but limited by smallest valve size of the product range under consideration) and twice

the size of the bigger valve (but limited by the largest valve size of the product range under

consideration) which were tested.

If the construction principle, design and materials are not the same for the whole product range, the

product range shall be split in separate ranges (where the construction principle, design and materials

are the same) and the above mentioned rule shall be applied to each split range. The manufacturer is

responsible to ensure that the complete test sequence as specified in this document is carried out and

all test results are documented.
5.2.3 Test specimens from casings and thermal insulation

The test specimens from casing and thermal insulation shall be taken in accordance with EN 448.

5.3 Steel parts
5.3.1 General
This clause describes the type test and production test of the steel parts.
5.3.2 Type test of the steel parts
5.3.2.1 General
The type test shall be done on the same valve.

The type test shall be carried out on the same valve for the whole test sequence and executed in the

order given in Table 2. The mandatory clauses shall be carried out as a minimum in the test program.

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SIST EN 488:2020
EN 488:2019 (E)
Table 2 — Overview and sequence of the type test program
Test sequence Name of the test
Mandator Optional
y clauses clauses
5.3.2.2 Leak-tightness of shell and stem casing of the unloaded valve
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.5 Axial compressive force test
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.6 Axial tensile force test
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.7 Bending test
5.3.2.2 Leak-tightness of shell and stem casing of the unloaded valve
5.3.2.3 Leak-tightness of the seat of the unloaded valve
5.3.2.4 Torque load measurement of the unloaded valve
5.3.2.2 Leak-tightness of shell and stem casing of the unloaded valve
Test condition:
— according to EN 12266-1, P10 and P11, type test.
Test requirement:
— shell and stem casing shall be leak-tight.
5.3.2.3 Leak-tightness of the seat of the unloaded valve
Test condition:
— according to EN 12266-1, P12, type test.
Test requirement:

— the maximum seat leakage of the seat during the test shall be in accordance to EN 12266-1,

test number P12 rate A for valves up to DN 400 or rate B for valves higher than DN 400;

— for the last mandatory leak tightness test after completion of the whole test sequence (axial

compressive force, axial tensile force and bending test) the maximum seat leakage rate B is

acceptable for all valve sizes.
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SIST EN 488:2020
EN 488:2019 (E)
5.3.2.4 Torque load measurement of unloaded valve
Test conditions:
— valve filled with water at temperature (25 ± 10) °C.
Test requirements:

— The torque value in any test shall not be higher than the maximum value in the technical

specification of the manufacturer;
— the torque shall be measured and recorded when closing and opening the valve;

— all test torque measurements shall be recorded and stated in test reports for evaluation.

5.3.2.5 Axial compressive force test
Test conditions:
— valve shall be in an open position;
— valve loaded with an axial compressive force in accordance with Table B.1;

— internal water pressure for the valve accordance with the nominal pressure class PN of the valve;

— valve filled with water at temperature (90 ± 5) °C. Forming of steam shall be prevented at all times;

— test duration shall be 48 h;

— compressive force, water pressure, water temperature shall be measured and recorded

continuously;

— torque, when closing and opening of the valve, shall be measured and recorded at least 24 times

during the test period of 48 h with a minimum of 30 min between the measurements;

— before the valve is opened to measure the torque, the pressure at one side of the valve shall be

relieved to zero pressure;

— the last measurement of the torque will be done at the end of the 48-h test period.

Test requirements:

— the valve shall be able to withstand the axial compressive force, according to Table B.1, without

leaking or damaging;

— The torque value in any test shall not be higher than the maximum value in the technical

specification of the manufacturer.
5.3.2.6 Axial tensile force test
Test conditions:
— valve shall be in an open position;
— valve loaded with an axial tensile force in accordance with Table B.1;

— internal water pressure in accordance with the nominal pressure class PN of the valve;

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SIST EN 488:2020
EN 488:2019 (E)
— valve filled with water at temperature (25 ± 10) °C;
— test duration shall be 48 h;

— tensile force, water pressure, water temperature shall be measured and recorded continuously;

— torque, when closing and opening of the valve, shall be measured and recorded at least 16 times

(open and close) during the test period of 48 h with a minimum of 30 min between the

measurements;

— after the valve is closed while measuring the torque, the pressure at one side of the valve shall be

relieved to zero pressure, before opening the valve while measuring the torque (again);

— the last measurement of the torque will be done at the end of the 48-h test period.

Test requirements:

— the valve shall be able to withstand the axial tensile force, according to Table B.1, without leaking or

damaging;

— The torque value in any test shall not be higher than the maximum value in the technical

specification of the manufacturer.
5.3.2.7 Bending test
The bending test shall be performed in accordance with Annex B and Annex C.
Test conditions:
— valve shall be in an open position;
— valve loaded with a bending moment in accordance with Table B.1;

— internal water pressure in accordance with the nominal pressure class PN of the valve;

— the bending test shall be carried out at temperature of (25 ± 10) °C;
— test medium is water;
— test duration shall be 8 h (two times);

— the test can be executed for all diameters according to the four points bending test, described in

Annex C;

— when closing and opening of the valve, shall be measured and recorded at least 8 times (open and

close) during the test period of 8 h with a minimum of 30 min between the measurements.

— after the valve is closed while measuring the torque, the pressure at one side of the valve shall be

relieved to zero pressure, before opening the valve while measuring the torque (again);

— the last measurement of the torque will be done at the end of the 8-h test period;

— the test shall be executed two times (in two planes), one plane defined by the axis of the stem and

the pipe axis, the second plane defined by an axis perpendicular to the axis of the stem and the pipe

axis.
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SIST EN 488:2020
EN 488:2019 (E)
Test requirements:

— the valve body shall be able to withstand the bending moment, according to Table B.1, without

leaking or damaging;

— after loading, the applied torque in open and closed direction shall be measured. The torque value

in any test shall not be higher than the maximum value in the technical specification of the

manufacturer.
5.3.3 Production testing of valves
5.3.3.1 General
Production tests on valves shall be carried out as in Table 3.
Table 3 — Overview of the production tests
Order Test Clause
1 Leak-tightness of shell and stem casing of the unloaded valve 5.3.3.2
2 Leak-tightness of the seat of the unloaded
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