Bs En 1074-2 Valves For Water Service Supply - Isolating Valves.pdf

BRITISH STANDARD

BS EN 1074-2:2000

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Incorporating Amendments Nos. 1 and 2

Valves for water supply — Fitness for purpose requirements and appropriate verification tests — Part 2: Isolating valves

The European Standard EN 1074-2:2000, with the incorporation of amendment A1:2004, has the status of a British Standard

ICS 23.060.01; 91.140.60

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BS EN 1074-2:2000

National foreword This British Standard is the official English language version of EN 1074-2:2000, including amendment A1:2004. Together with BS EN 1074-1:2000, BS 5163-1:2004 and BS 5163-2:2004, this part of BS EN 1074 supersedes BS 5163:1986, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PSE/7, Industrial valves, to Subcommittee PSE/7/3, Cast iron isolating, check and hydrant valves for industrial use and valves for water industry applications, which has the responsibility to: —

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.

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—

A list of organizations represented on this subcommittee can be obtained on request to its secretary. Additional information To assist UK users of this standard, Subcommittee PSE/7/7 has produced BS 5163-1, a code of practice that provides guidance on the selection of gate valves for water distribution networks within the UK. The valves discussed are primarily for underground use for waterworks purposes and for use with water intended for human consumption in the UK. This guidance is intended to help identify the most cost-effective way to procure suitable gate valves. The code takes account of the customs and practices developed in the UK water industry for the operation of water distribution pipelines with particular attention to health and safety matters. The BS EN 1074 series of standards does not specify requirements for stem caps, which are required to satisfy UK operational practices. PSE/7/7 has therefore produced British Standard, BS 5163-2, which covers stem caps for use on isolating valves and associated water control apparatus. 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. This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 July 2000

Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication

© BSI 23 December 2004

ISBN 0 580 35956 5

Amd. No.

Date

Comments

15171

13 May 2004

Changes to C.2

15231

23 December 2004

National foreword amended

EUROPEAN STANDARD

EN 1074-2

NORME EUROPÉENNE

April 2000

+ A1

EUROPÄISCHE NORM

April 2004

ICS 23.060.01

English version

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Valves for water supply – Fitness for purpose requirements and appropriate verification tests – Part 2: Isolating valves (includes amendment A1:2004)

Robinetterie pour l’alimentation en eau – Prescriptions d’aptitude à l’emploi et vérifications s’y rapportant - Partie 2: Robinetterie de sectionnement (inclut l’amendement A1:2004)

Armaturen für die Wasserversorgung – Anforderungen an die Gebrauchstauglichkeit und deren Prüfung - Teil 2: Absperrarmaturen (enthält Änderung A1:2004)

This European Standard was approved by CEN on 26 November 1999; amendment A1 was approved by CEN on 27 February 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 Central Secretariat 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 Central Secretariat 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 COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

Central Secretariat: rue de Stassart, 36

© 2000 CEN

All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

B-1050 Brussels

Ref. No. EN 1074-2:2000 + A1:2004 E

Page 2 EN 1074-2:2000

Contents Foreword ...........................................................................................................................................................3

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Introduction.......................................................................................................................................................4 1

Scope ....................................................................................................................................................4

2

Normative references ..........................................................................................................................4

3

Definitions ............................................................................................................................................5

4

Design requirements ...........................................................................................................................5

5 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.3 5.4 5.5

Performance requirements.................................................................................................................5 Mechanical strength ............................................................................................................................5 Resistance to internal pressure of the shell and of all pressure containing components..........5 Resistance of the obturator to differential pressure........................................................................5 Resistance of the valve to bending ...................................................................................................5 Resistance of valves to operating loads ...........................................................................................6 Leak-tightness .....................................................................................................................................6 Leak-tightness of the shell and of all pressure containing components ......................................6 Seat tightness ......................................................................................................................................7 Maximum operating torque (MOT) for operation and leak-tightness.............................................7 Leak-tightness of gearboxes to external pressure ..........................................................................8 Hydraulic characteristics ....................................................................................................................8 Resistance to disinfection products..................................................................................................8 Endurance ............................................................................................................................................8

6 6.1 6.2 6.3

Conformity assessment ......................................................................................................................8 General .................................................................................................................................................8 Type tests .............................................................................................................................................8 Control of production process and quality system .........................................................................8

7

Marking .................................................................................................................................................8

8

Packaging .............................................................................................................................................9

Annex A (normative) Test method for the resistance of valves to operating loads (see 5.1.4) ............10 Annex B (normative) Torque requirements for gate valves to be operated by ring key and bar (see 5.2.3 and annex A) .....................................................................................................................11 Annex C (normative) Test method for the operation of valves (see 5.2.3) ..............................................12 Annex D (normative) Test method for the endurance of valves (see 5.5) ...............................................13

Page 3 EN 1074-2:2000

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 October 2000, and conflicting national standards shall be withdrawn at the latest by October 2000. It consists of six parts:

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Part 1: General requirements Part 2: Isolating valves Part 3: Check valves Part 4: Air valves Part 5: Control valves Part 6: Hydrants. Part 1, in conjunction with the subsequent parts, lays down the general requirements and test procedures to be carried out in production and during the assessment of conformity of these valves (type tests). The detailed requirements, which depend on the types of valves, are defined in parts 2 to 6 of this standard. The annexes A, B, C and D of this European Standard are normative. 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 1074-2:2000/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 EN 1074-2:2000/A1:2004 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2004 and conflicting national standards shall be withdrawn at the latest by October 2004. 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.

Page 4 EN 1074-2:2000

Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by the product covered by this standard: 1) This standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA.

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2) It should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force.

1

Scope

This European Standard defines the minimum fitness for purpose requirements for isolating valves to be used in, or connected to, water supply pipe systems, above or below ground (see EN 805), carrying water intended for human consumption. This standard specifies the design requirements, the performance requirements, and the conformity assessment method for isolating valves, whatever their type and materials. This standard applies in priority to any other product or test standard: the requirements from other standards apply only when this standard refers to them. This part of the standard deals with the requirements applicable to isolating valves up to DN 2 000 and PFA 6 bar to PFA 25 bar.

2

Normative references

This European Standard incorporates, by dated or undated references, 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 revisions of 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. EN 736-1, Valves - Terminology - Part 1: Definition of the types of valves. EN 736-3, Valves - Terminology - Part 3: Definition of terms. EN 1074-1, Valves for water supply - Fitness for purpose requirements and appropriate verification tests Part 1: General requirements. EN 1267, Valves - Test of flow resistance using water as test fluid. EN 805, Water supply - Requirements for systems and components outside buildings. prEN 12570:1999, Industrial Valves - Permissible manual forces for operation of valves.

Page 5 EN 1074-2:2000

3

Definitions

For the purpose of this standard, the definitions of EN 1074-1 apply, together with the following definitions: 3.1 flow coefficient KV: Coefficient equal to the flow rate, in cubic metres per hour, of water at a temperature between 5 °C and 40 °C, passing through the valve and causing a loss of static head of 1 bar (EN 736-3). 3.2

isolating valve: Valve intended for use only in the closed or fully open position (EN 736-1).

3.3 full bore valve: Valve with a seat diameter not less than 90 % of the internal nominal diameter of the body end port (EN 736-3).

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3.4 clear way valve: Valve designed to have an unobstructed flow way which allows the passage of a theoretical sphere with a diameter which is not less than the nominal inside diameter of the body end port (EN 736-3).

4

Design requirements

Isolating valves shall be designed in accordance with the requirements given in clause 4 of EN 1074-1.

5

Performance requirements

5.1 5.1.1

Mechanical strength Resistance to internal pressure of the shell and of all pressure containing components

Requirement and test shall be in accordance with 5.1.1 of EN 1074-1. 5.1.2

Resistance of the obturator to differential pressure

Requirement and test shall be in accordance with 5.1.2 of EN 1074-1. Except for valves to be used for a single flow direction, the test shall be performed successively in each flow direction. 5.1.3

Resistance of the valve to bending

Requirement and test shall be in accordance with 5.1.3 of EN 1074-1, for sizes DN 50 up to and including DN 500. The bending moments M to be applied during the test are given in table 1 as a function of DN.

Page 6 EN 1074-2:2000

Table 1 - Bending moments DN

M

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Nm

5.1.4

50

1 050

65

1 400

80

1 500

100

2 200

125

3 200

150

4 800

200

7 200

250

11 000

300

15 000

350

19 000

400

24 000

450

28 000

500

33 000

Resistance of valves to operating loads

Requirement shall be in accordance with 5.1.4 of EN 1074-1. When, in order to verify this requirement, a valve in its delivery state has been subjected to a test in accordance with annex A, with the application of a closing torque and an opening torque equal to mST, it shall pass the operating tests in accordance with 5.2.3 and the seat tightness tests in accordance with 5.2.2.1 and 5.2.2.2. The minimum strength torque mST shall be equal to twice the maximum operating torque (MOT) given in 5.2.3. In the case of gate valves in accordance with 5.2.3 c), the torque mST to be applied in the test in accordance with annex A shall be equal to 5 times MOT. In the case of valves in accordance with 5.2.3 d), the test is only applicable when there is an additional manual operating element.

5.2

Leak-tightness

5.2.1 5.2.1.1

Leak-tightness of the shell and of all pressure containing components Leak-tightness to internal pressure

Requirement and test shall be in accordance with 5.2.1.1 of EN 1074-1. 5.2.1.2

Leak-tightness to external pressure

Requirement and test shall be in accordance with 5.2.1.2 of EN 1074-1.

Page 7 EN 1074-2:2000 5.2.2

Seat tightness

5.2.2.1

Seat tightness at high differential pressure

Requirement and test shall be in accordance with 5.2.2.1 of EN 1074-1. After closing the valve by application of MOT (see 5.2.3), the leakage rate shall be rate A for resilient seated valves and shall not exceed rate B for metallic seated valves. For a type test, the test duration shall be not less than 10 min. Except for valves to be used in a single flow direction, the test shall be performed successively in each flow direction. 5.2.2.2

Seat tightness at low differential pressure

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Requirement and test shall be in accordance with 5.2.2.2 of EN 1074-1, with the torque, the leakage rate and the test duration given in 5.2.2.1. Except for valves to be used in a single flow direction, the test shall be performed successively in each flow direction. 5.2.3

Maximum operating torque (MOT) for operation and leak-tightness

Requirement shall be in accordance with 5.2.3 of EN 1074-1. When, in order to verify this requirement, an isolating valve in its delivery state is subjected to a test according to annex C, the measured torque shall not exceed the maximum operating torque MOT as defined below: a) for valves delivered with their operating element: - MOT = 0,5 x F x D in newton metres, in the case of a handwheel, where: F is the maximum operating manual force (F for operating the valve, Fmax for seating and unseating the valve, see prEN 12570:1999), in newtons; D is the diameter of the handwheel, in metres. - MOT = F x L in newton metres, in the case of a lever, where: F is the maximum operating manual force (F for operating the valve, Fmax for seating and unseating the valve, see prEN 12570:1999), in newtons; L is the length of the lever, in metres. b) for valves delivered without an operating element and intended to be operated by a T shaped key: - for butterfly valves: MOT = 125 Nm; - for gate valves: MOT = 1 x DN Nm; - for other types of valves: MOT = value given by the manufacturer. c) for gate valves delivered without an operating element and intended to be operated by a ring key and bar, see annex B. d) for valves to be operated electrically, hydraulically or pneumatically: - MOT = value given by the manufacturer.

Page 8 EN 1074-2:2000 5.2.4

Leak-tightness of gearboxes to external pressure

Requirement and test shall be in accordance with 5.2.4 of EN 1074-1.

5.3

Hydraulic characteristics

Requirement shall be in accordance with 5.3 of EN 1074-1; the characteristic given by the manufacturer shall be the flow coefficient Kv. When measured in accordance with the test method defined in EN 1267, the flow coefficient Kv shall be greater than 0,9 times the value indicated by the manufacturer. Testing is not required for full bore gate valves or clear way valves.

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5.4

Resistance to disinfection products

Requirement and test shall be in accordance with 5.4 of EN 1074-1.

5.5

Endurance

The endurance of isolating valves shall be evaluated as follows: - an isolating valve in its delivery state shall be subjected to an endurance test in accordance with annex D at a differential pressure equal to the PFA across the obturator; - it shall be tested in accordance with 5.2.1, 5.2.2 and 5.2.3, with the application of a torque not exceeding either 1,2 times MOT (with the same leakage rate) or MOT (with leakage allowed to increase by one rate). The number of opening/closing cycles to be applied during the endurance test shall be as follows: - manually operated valves: 250 cycles; - electrically, hydraulically or pneumatically operated valves: 2 500 cycles. This test shall be applied to isolating valves of sizes DN 50 up to and including DN 500.

6 6.1

Conformity assessment General

Requirement shall be in accordance with 6.1 of EN 1074-1.

6.2

Type tests

Requirement shall be in accordance with 6.2 of EN 1074-1; the type tests to be performed shall be those given in table 2.

6.3

Control of production process and quality system

Requirement shall be in accordance with 6.3 of EN 1074-1; the production control tests in table 2 are informative.

7

Marking

Requirement shall be in accordance with clause 7 of EN 1074-1.

Page 9 EN 1074-2:2000

8

Packaging

Requirement shall be in accordance with clause 8 of EN 1074-1.

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Table 2 - Requirements and tests a

Type tests

Production tests (informative)

see drawings and part lists see drawings see technical documentation see materials see test report or calculation report

-

End types and interchangeability Operating direction Maximum water velocity All materials, including lubricants, in contact with water intended for human consumption Internal corrosion and ageing resistance

see drawings and marking see drawings see clause 4 see test reports in accordance with national regulations see drawings, part lists and technical documentation

-

visual inspection of coatings

4.11

External corrosion and ageing resistance

see drawings, part lists and technical documentation

visual inspection of coatings

5.1.1

Resistance to internal pressure of the shell and of all pressure containing components Resistance of the obturator to differential pressure

see 5.1.1

see 5.1.1

see 5.1.2

-

5.1.3 5.1.4

Resistance of valves to bending Resistance of valves to operating loads

see 5.1.3 see 5.1.4

-

5.2.1.1 5.2.1.2

Leak-tightness to internal pressure Leak-tightness to external pressure

see 5.2.1.1 see 5.2.1.2

see 5.2.1.1

5.2.2.1

Seat tightness at high differential pressure

see 5.2.2.1 and 5.2.3

see 5.2.2.1 and 5.2.3

5.2.2.2

Seat tightness at low differential pressure

see 5.2.2.2 and 5.2.3

5.2.3

Maximum operating torque (MOT)

see 5.2.2.1, 5.2.2.2 and 5.2.3

5.2.4

Leak-tightness of gearboxes to external pressure

see 5.2.4

-

5.3

Hydraulic or airflow characteristics

see 5.3

-

5.4 5.5

Resistance to disinfection products Endurance

see 5.4 see 5.5

-

Sub a clause 4.1 4.2 4.3 4.4

Materials DN Pressures Temperatures

4.5

Design of the shell and obturator

4.6 4.7 4.8 4.9

4.10

5.1.2

a

Requirement

The sub-clauses and requirements shown above, are those given in EN 1074-1

-

see 5.2.2.1

Page 10 EN 1074-2:2000

Annex A (normative) Test method for the resistance of valves to operating loads (see 5.1.4)

A.1 General The test shall be performed at ambient temperature on a valve in its delivery state.

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The test shall begin with the obturator fully or partially open.

A.2 Test procedure Place the valve on the testing equipment. Apply a torque at the entrance point of the mechanical energy (see EN 1074-1) in order to close the obturator. In the specific case of valves to be operated by means of a ring key and bar (see annex B), apply simultaneously the torque and the bending moment. Increase the closing torque until it reaches mST. Maintain the torque mST for at least 10 min. Open the obturator until it reaches the fully open position. Increase the opening torque until it reaches mST. Maintain the torque mST for at least 10 min. Check the operation ability in accordance with 5.2.3 and the seat tightness in accordance with 5.2.2.

Page 11 EN 1074-2:2000

Annex B (normative)

Torque requirements for gate valves to be operated by ring key and bar (see 5.2.3 and annex A)

Where gate valves are operated by means of a ring key and bar, they are therefore required to have higher minimum strength torques (mST); they shall comply with the torque requirements given in table B.1.

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Table B.1 - Torque requirements MOT

mST

Nm

Nm

DN + 60 a

5 MOT

a

Applied simultaneously with a bending moment of 1 500 Nm on the operating mechanism

Page 12 EN 1074-2:2000

Annex C (normative) Test method for the operation of valves (see 5.2.3)

C.1 General The test shall be performed at ambient temperature on a valve in its delivery state.

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The test shall begin with the obturator in the fully open position.

C.2 Test procedure Fit a blanking plate containing a vent valve to the outlet flange, and the inlet to a hydrostatic pressure source. Partially open the obturator and the vent valve. Fully fill the body with water and vent all the air from the valve. Close the obturator and apply a torque equal to MOT. Raise the pressure until it reaches PFA and maintain it for at least one minute. Check for seat tightness. Open the valve. During opening the running torque should not exceed MOT. NOTE A large volume of water is evacuated from the vent valve.

Close the valve. During closing the running torque should not exceed MOT. Note the maximum torque required during the test and check that it does not exceed MOT. Re-start the test on the other side.

Annex D (normative)

Page 13 EN 1074-2:2000

Test method for the endurance of valves (see 5.5)

D.1 General The test shall be carried out at ambient temperature on a valve in its delivery state.

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The test assembly should be designed to minimize water consumption and cycle time.

D.2 Test procedure Fix the valve on a test rig, with the obturator fully open. Blank off one end of the valve and provide a means of: - venting air from the valve; - pressurizing the closed end with water; - measuring the pressure. Bring the obturator to the fully closed position as follows: - for a valve with an actuator, close the obturator by means of the actuator using the source of energy at the maximum level specified by the manufacturer; - for a manually operated valve, close the obturator and apply a torque equal to MOT. Fill with water the space between the obturator and the blank flange, and vent the air. Increase the water pressure until it reaches a minimum of PFA and maintain the pressure for at least 5 s. Open the obturator fully. Repeat the cycle closing/pressurizing/opening for the specified number of cycles. Check the leak-tightness of the shell and of all the pressure containing components in accordance with 5.2.1. Check the seat tightness in accordance with 5.2.2.: apply a closing torque equal to MOT and check that the leakage rate does not exceed the value given in 5.2.2 increased by one rate; if it is exceeded, increase the applied torque to 1,2 times MOT and check that the leakage rate does not exceed the value given in 5.2.2. Check that the operating torque does not exceed MOT according to 5.2.3. Record the test conditions and test results, noting the calibration status of all measuring devices.

BS EN 1074-2:2000

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