SIST EN 13434:2022
(Main)Devices to prevent pollution by backflow of potable water - Mechanical disconnector, flow actuated - Family G, Type B
Devices to prevent pollution by backflow of potable water - Mechanical disconnector, flow actuated - Family G, Type B
This document specifies, the dimensional, the physical-chemical, the design, the hydraulic, the mechanical and the acoustic characteristics of mechanical disconnectors flow actuated Family G, type B.
This document is applicable to mechanical disconnectors flow actuated in nominal sizes DN 8 up to DN 250, intended to prevent the return of water having lost its original sanitary and drinking qualities (called “polluted water” in this document), into the potable water distribution system whenever the pressure of the latter is temporarily lower than in the polluted circuit.
This document covers the mechanical disconnector of PN 10 that are capable of working without modification or adjustment:
- at any pressure up to 1,0 MPa (10 bar);
- in permanent duty at a limit temperature of 65 °C and 90 °C for 1 h maximum.
It specifies also the test methods and requirements for verifying these characteristics, the marking and the presentation at delivery.
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch Rückfließen - Rohrtrenner, durchflussgesteuert - Familie G, Typ B
Dieses Dokument legt die maßlichen und physikalisch-chemischen Anforderungen, die Anforderungen an die Konstruktion, die hydraulischen, mechanischen und akustischen Anforderungen an durchflussgesteuerte Rohrtrenner, Familie G, Typ B fest.
Dieses Dokument gilt für durchflussgesteuerte Rohrtrenner der Nennweiten DN 8 bis DN 250, die verhindern sollen, dass Wasser, das seine ursprüngliche Qualität für sanitäre Zwecke und als Trinkwasser verloren hat (in diesem Dokument „verunreinigtes Wasser“ genannt) in das Trinkwasserversorgungsnetz zurückfließt, wenn der Druck in diesem Netz vorübergehend niedriger ist als in dem verunreinigten Kreislauf.
Dieses Dokument behandelt die mechanischen Rohrtrenner mit der Druckstufe PN 10, die ohne Abänderung oder Nachstellung funktionsfähig sind:
- bei jedem Druck bis 1,0 MPa (10 bar);
- unter Dauerbelastung bei einer Grenztemperatur von 65 °C sowie bei 90 °C für höchstens 1 h.
Diese Norm legt ferner die Prüfverfahren und die Anforderungen für den Nachweis dieser Eigenschaften, die Kennzeichnung und den Lieferzustand fest.
Dispositifs de protection contre la pollution par retour de l’eau potable - Disconnecteur mécanique actionné en fonction du débit - Famille G, type B
Le présent document spécifie les caractéristiques dimensionnelles, physico-chimiques, de conception, hydrauliques, mécaniques et acoustiques des disconnecteurs mécaniques actionnés en fonction du débit de famille G, type B.
Le présent document s’applique aux disconnecteurs mécaniques actionnés en fonction du débit dont le diamètre nominal va de DN 8 à DN 250, destinés à éviter le retour d’une eau ayant perdu ses qualités sanitaires et alimentaires d’origine (appelée « eau polluée » dans le présent document) dans le réseau d’eau potable lorsque la pression dans ce dernier est temporairement plus faible que dans le circuit pollué.
Le présent document couvre les disconnecteurs mécaniques de PN 10 pouvant fonctionner sans modification ni réglage :
- à toute pression jusqu’à 1,0 MPa (10 bar) ;
- en service continu à une température limite de 65 °C et 90 °C pendant une durée d’une heure maximum.
Il spécifie également les méthodes d’essai et les exigences pour vérifier leurs caractéristiques, le marquage et la présentation à la livraison.
Naprave za varovanje pitne vode pred onesnaženjem zaradi povratnega toka - Mehanski ločilniki, aktivirani s pretokom - Družina G, tip B
Ta dokument določa dimenzijske, fizikalno-kemijske, konstrukcijske, hidravlične, mehanske in akustične lastnosti mehanskih ločilnikov, aktiviranih s pretokom, družina G, tip B.
Ta dokument se uporablja za mehanske ločilnike, aktivirane s pretokom, nazivnih velikosti od DN 8 do DN 250, namenjene preprečevanju povratnega toka vode, ki je izgubila prvotne sanitarne in pitne lastnosti (v tem dokumentu imenovana »onesnažena voda«), v sistem za distribucijo pitne vode, kadar koli je tlak v sistemu začasno nižji kot v onesnaženem krogotoku.
Ta dokument zajema mehanske ločilnike PN 10, ki lahko delujejo brez spreminjanja ali prilagajanja:
– pri poljubnem tlaku do 1,0 MPa (10 bar);
– pri trajnem obratovanju največ 1 uro ob mejni temperaturi 65 °C in 90 °C.
Določa tudi preskusne metode in zahteve za preverjanje teh lastnosti, označevanje in predstavitev ob dobavi.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13434:2022
01-februar-2022
Naprave za varovanje pitne vode pred onesnaženjem zaradi povratnega toka -
Mehanski ločilniki, aktivirani s pretokom - Družina G, tip B
Devices to prevent pollution by backflow of potable water - Mechanical disconnector, flow
actuated - Family G, Type B
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Rohrtrenner, durchflussgesteuert - Familie G, Typ B
Dispositifs de protection contre la pollution par retour de l’eau potable - Disconnecteur
mécanique actionné en fonction du débit - Famille G, type B
Ta slovenski standard je istoveten z: EN 13434:2021
ICS:
13.060.20 Pitna voda Drinking water
23.060.50 Blokirni ventili Check valves
SIST EN 13434:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 13434:2022
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SIST EN 13434:2022
EN 13434
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2021
EUROPÄISCHE NORM
ICS 23.060.50
English Version
Devices to prevent pollution by backflow of potable water
- Mechanical disconnector, flow actuated - Family G, Type
B
Dispositifs de protection contre la pollution par retour Sicherungseinrichtungen zum Schutz des Trinkwassers
de l'eau potable - Disconnecteur mécanique actionné gegen Verschmutzung durch Rückfließen -
en fonction du débit - Famille G, type B Rohrtrenner, durchflussgesteuert - Familie G, Typ B
This European Standard was approved by CEN on 8 November 2021.
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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13434:2021 E
worldwide for CEN national Members.
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SIST EN 13434:2022
EN 13434:2021 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Denomination. 9
5 Designation . 9
6 Symbolization . 9
7 Physical-chemical characteristics. 10
7.1 General. 10
7.2 Materials . 10
7.2.1 General. 10
7.2.2 Dezincification resistant copper alloy . 10
7.3 Surface of the body . 10
7.3.1 General. 10
7.3.2 Epoxy Coating . 10
7.3.3 Polyamide Powder based Coating . 10
7.3.4 Other coatings . 10
8 Design . 11
8.1 General. 11
8.2 Relief valve/Obturator . 11
8.2.1 General requirements . 11
8.2.2 Mechanical Disconnector Family G, Type B . 11
8.3 Disconnection distance . 12
9 Characteristics and tests . 12
9.1 General. 12
9.2 General tolerances . 12
9.2.1 Tolerance of set parameters . 12
9.2.2 Accuracy of measuring instruments . 12
9.3 Expression of the results . 12
9.4 Dimensional characteristics . 12
9.4.1 Connections . 12
9.4.2 Pressure tapping . 12
9.5 Mechanical characteristics . 13
9.5.1 General. 13
9.5.2 Mechanical resistance of the body under pressure . 13
9.5.3 Endurance . 14
9.5.4 Torque test of Captive rotating Nuts and Bending Strength – Tightness of the Body 15
9.6 Leak tightness characteristics . 16
9.6.1 Verification of the leak tightness of the downstream check valve in closing
direction . 16
9.6.2 Verification of the leak tightness of check valve device (opening direction) . 17
2
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SIST EN 13434:2022
EN 13434:2021 (E)
9.6.3 Verification of the leak tightness of the upstream spring loaded obturator in drain
position at low pressure (in the opening direction) . 17
9.7 Hydraulic characteristics . 18
9.7.1 Test rig— General circuit . 18
9.7.2 Verification of the pressure loss as a function of flow rate . 19
9.7.3 Verification of the opening and closing pressures of relief valve . 20
9.7.4 Verification of the relief valve flow rate . 20
9.8 Compatibility with the products used for shock disinfection of the networks . 21
9.8.1 Requirement . 21
9.8.2 Test method . 21
9.9 Acoustic tests . 21
9.9.1 General . 21
9.9.2 Procedure . 21
10 Order of testing . 22
11 Marking and technical documents . 23
11.1 General . 23
11.2 Marking . 23
11.3 Technical documents . 24
12 Presentation at delivery . 24
Annex A (informative) Examples of presentation of test results. 25
Bibliography . 28
3
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SIST EN 13434:2022
EN 13434:2021 (E)
European foreword
This document (EN 13434:2021) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, 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 June 2022, and conflicting national standards shall be
withdrawn at the latest by June 2022.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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.
4
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SIST EN 13434:2022
EN 13434:2021 (E)
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this document:
1) this document provides no information as to whether the product may be used without restriction
in any of the member states of the EU or EFTA;
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.
5
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SIST EN 13434:2022
EN 13434:2021 (E)
1 Scope
This document specifies the dimensional, physical-chemical, design, hydraulic, mechanical and acoustic
characteristics of mechanical disconnectors, flow actuated Family G, Type B.
This document is applicable to mechanical disconnectors flow actuated in nominal sizes DN 8 up to
DN 250, intended to prevent the return of water having lost its original sanitary and drinking qualities
(called “polluted water” in this document), into the potable water distribution system whenever the
pressure of the latter is temporarily lower than in the polluted circuit.
This document covers the mechanical disconnectors of PN 10 that are capable of working without
modification or adjustment:
— at any pressure up to 1,0 MPa (10 bar);
— in permanent duty at a limit temperature of 65 °C and 90 °C for 1 h maximum.
It specifies also the test methods and requirements for verifying these characteristics, the marking and
the presentation at delivery.
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 806-1, Specifications for installations inside buildings conveying water for human consumption - Part 1:
General
EN 1329-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the
building structure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes, fittings and
the system
EN 1453-1, Plastics piping systems with structured-wall pipes for soil and waste discharge (low and high
temperature) inside buildings - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes
and the system
EN 1717:2000, Protection against pollution of potable water in water installations and general
requirements of devices to prevent pollution by backflow
EN 10310:2003, Steel tubes and fittings for onshore and offshore pipelines - Internal and external polyamide
powder based coatings
EN 13959, Anti-pollution check valves - DN 6 to DN 250 inclusive family E, type A, B, C and D
EN 14901-1, Ductile iron pipes, fittings and accessories - Requirements and test methods for organic
coatings of ductile iron fittings and accessories - Part 1: Epoxy coating (heavy duty)
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 3822-1, Acoustics - Laboratory tests on noise emission from appliances and equipment used in water
supply installations - Part 1: Method of measurement (ISO 3822-1)
6
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SIST EN 13434:2022
EN 13434:2021 (E)
EN ISO 3822-3:2018, Acoustics - Laboratory tests on noise emission from appliances and equipment used in
water supply installations - Part 3: Mounting and operating conditions for in-line valves and appliances (ISO
3822-3:2018)
EN ISO 6509-1, Corrosion of metals and alloys - Determination of dezincification resistance of copper alloys
with zinc - Part 1: Test method (ISO 6509-1)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1717, EN 806-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
mechanical disconnector, flow actuated — Family G, Type B
device, also referred to as “GB”, the characteristics of which are as follows:
— two pressure zones in flow position: upstream and downstream;
— three pressure zones in drain position (zero-flow): upstream, intermediate and downstream. The
upstream spring loaded obturator with discharge system and the downstream check valve separate
the intermediate zone from the upstream and downstream zone;
— the disconnector is actuated by a mechanical hydraulic valve;
— at zero flow the disconnector is in drain position;
— flow position is achieved at a pressure difference ΔP ≥ 50 kPa (0,5 bar);
— a determined relief flow rate;
— a drain position visible directly or by a position indicator
Note 1 to entry: See Figure 1.
Note 2 to entry: For the purposes of this document, “Mechanical disconnector, flow actuated – Family G, Type B”
are hereafter referred to as “device”.
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SIST EN 13434:2022
EN 13434:2021 (E)
Key
1, 2, 3 pressure zones
D disconnection distance
Figure 1 — Design principle of Mechanical disconnector, flow actuated – Family G, Type B
3.2
inlet pressure
p
1
pressure on upstream (inlet side, zone 1) of the device
3.3
intermediate pressure
p
i
pressure in the intermediate zone of the device (in drain position p = p and under flow condition
i atm.
p = p ) (zone 3)
i 1
3.4
outlet pressure
p
2
pressure on the downstream (outlet side, zone 2) of the device
3.5
differential pressure (in static position)
Δp
differential pressure between the inlet pressure p and the outlet pressure p
1 2
3.6
differential pressure (in flow position)
Δpf
differential pressure between the inlet pressure p and the outlet pressure p in flow position
1 2
3.7
differential pressure (in drain position)
Δpd
differential pressure between the inlet pressure p and the outlet pressure p in drain position
1 2
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SIST EN 13434:2022
EN 13434:2021 (E)
3.8
set pressure
p
s
pressure at which the relief valve starts to open
3.9
disconnection distance
D
minimal vertical distance between the seat 1 of the relief valve and the seat 2 (see Figure 1) of the
upstream zone
4 Denomination
For the purpose of this document for the devices the nominal sizes DN is a function of the minimum flow
rate given in Table 4.
5 Designation
Mechanical disconnectors flow actuated Family G, Type B are designated by:
— name of the product;
— family and type;
— reference to this document, EN 13434;
— nominal size;
— connection type;
— material of its body;
— surface finish (coatings);
— acoustic group (if applicable).
EXAMPLE Mechanical disconnector direct actuated, family G type B, EN 13434, DN 32, G 1 1/4 × G 1 1/4,
CW617N, I.
6 Symbolization
The graphic representation of the mechanical disconnector flow actuated Family G, Type B is as follows
(see Figure 2):
Figure 2 — Graphic symbol design principle of Mechanical disconnector
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SIST EN 13434:2022
EN 13434:2021 (E)
7 Physical-chemical characteristics
7.1 General
The selection of materials is the responsibility of the manufacturer, provided they satisfy the following
requirements:
a) materials and coatings shall not contaminate the potable water;
b) in a technical document, the manufacturer shall state the nature of the materials and coatings used;
c) materials with inadequate corrosion resistance shall have additional protection;
d) the materials used shall be suitable for the temperatures specified in the tests in this document;
e) the materials, and in particular copper alloys, for which recommendations or international standards
exist, shall comply with the relevant European standards.
7.2 Materials
7.2.1 General
All materials coming into contact with water intended for human consumption shall present no health
risk nor cause any change to the water in terms of quality, appearance, smell or taste.
NOTE While awaiting the adoption of verifiable European criteria for testing materials in contact with water
intended for human consumption, existing national regulations concerning the use and/or the characteristics of
these products remain in force.
7.2.2 Dezincification resistant copper alloy
Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when submitted to
water capable of dezincification. In the countries where the use of products made of dezincification
resistant materials is required, the materials used shall guarantee a dezincification depth less than
200 μm in any direction. For this purpose materials shall be tested in accordance with EN ISO 6509-1 and
the product shall be marked in compliance with the indications according to Clause 10.
7.3 Surface of the body
7.3.1 General
The outside and inside surfaces of the device may or may not contain a coating. Such coating shall not
impair the functional characteristics of the device.
The coating for protection of the basic material against corrosion may be either realized by epoxy coating
or by polyamide powder based coating.
7.3.2 Epoxy Coating
Epoxy Coating shall fulfil the requirements of and be tested in accordance with Annex A, Table A.1.
7.3.3 Polyamide Powder based Coating
Polyamide powder shall fulfil the requirements of and be tested in accordance with Annex A, Table A.1.
7.3.4 Other coatings
If other coatings are used, they shall be tested according to the related coating standards and shall at least
perform the same quality as described in 7.3.2 and 7.3.3.
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EN 13434:2021 (E)
8 Design
8.1 General
a) The internal components of the device shall be accessible for inspection, repair or replacement. By
design, the components shall be able to be refitted at their initial place, without ambiguity
(impossibility of reversal, interchange of obturators, diaphragms, and springs). A visible mark is not
sufficient.
b) Additional control devices shall not influence the safety function.
c) The settings of the springs shall be fixed and not adjustable.
d) The device shall comprise one pressure tapping and a visible indication on the device when the
obturator is in the drain position. The pressure tapping is located on the inlet of the device.
e) Only the flow of water can operate the control of the internal components of the device.
8.2 Relief valve/Obturator
8.2.1 General requirements
In all the installation positions indicated by the manufacturer, any water retention shall not be possible
within the intermediate zone.
The cross-section of the passage orifices and of the pilot tube for operation of the relief device shall be
2
equal to or greater than an area of 12,5 mm , In case of un-machined cross — sections the smallest
dimension should be ≥ 4 mm. The outside pilot tube shall be made so as not to be vulnerable to any
permanent deformation or rupture caused by external loading.
An air break to drain shall exist between any waste drain and any means of collecting the discharged
water (floor, tundish, curb, sink).
The device with an air break to drain fitted shall evacuate the full relief flow rate as defined in 9.7.4.
The air break to drain shall meet the dimensional requirements as specified in EN 1717.
This air break to drain shall be:
— either directly incorporated into the device;
— or factory fitted;
— or supplied with the device.
In the latter case, the relief orifice of the device shall permit neither the fitting of a standardized threaded
pipe, nor the connection of a standardized pipe or shape, neither by adhesive, welding nor interlocking.
If applicable on the dimension “G” of the outlet of the air break to drain (see in EN 1717:2000, Clause 9),
it shall be possible to fit a standardized drain pipe (Standard EN 1329-1 PVC compact or EN 1453-1 PVC
with structured walls).
The opening of the drain shall be equal or larger than the outlet of the device.
8.2.2 Mechanical Disconnector Family G, Type B
At 0-flow or p ≤ 14 kPa (0,14 bar), the relief valve is in drain position. There shall be a visible indication
1
on the device when the obturator is in the drain position. The relief valve is controlled by a 3-way
differential pressure valve with on/off function.
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EN 13434:2021 (E)
8.3 Disconnection distance
In drain position the obturator shall close the opening from upstream zone to the intermediate zone. The
disconnection distance shall be at least 20 mm.
The drain port shall be closed, before flow condition is achieved. The passage orifice of the drain port
shall be at least equal to the minimum cross-section of the outlet water way (downstream).
9 Characteristics and tests
9.1 General
Performance tests shall be carried out on the device as installed in accordance with the manufacturer’s
technical documents.
If not specified all tests shall be performed with water at ambient temperature.
9.2 General tolerances
9.2.1 Tolerance of set parameters
In the absence of any particular specifications given in this document:
— flow rate and pressure: ± 2 % of the value specified;
— temperature: cold water ± 5 °C of the value specified; hot water ± 2 °C of the value specified;
10
— time: + % of the value specified.
0
9.2.2 Accuracy of measuring instruments
Instruments for measuring temperature shall be accurate to ±1 K. All other measuring instruments shall
have an error limit of maximum ± 2 % of the measured value.
9.3 Expression of the results
The measured values shall be registered. These results can be expressed as a curve. See Annex A for
example.
9.4 Dimensional characteristics
9.4.1 Connections
The connections shall be in accordance with the relevant European Standards.
9.4.2 Pressure tapping
The device shall have a pressure tapping orifice in the upstream zone according to the indications as
shown in Figure 3 and Table 1.
The bores for pressure tapping shall have over their full depth a minimum cross-section area of
2
12,56 mm . Their smallest dimension shall be 4 mm.
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SIST EN 13434:2022
EN 13434:2021 (E)
Table 1 — Dimension of thread and test parts
Thread
a
DN
(designation in accordance with
mm
EN ISO 228-1)
≤ 15 G 1/8 or G 1/4 ≥ 6,5
20 ≤ DN ≤ 50 G 1/4 ≥ 6,5
> 50 G 1/2 ≥ 13
Key
G thread
a thread length
Figure 3 — Pressure tapping orifice
These pressure tappings shall be fitted with isolating valves:
— For devices DN ≤ 15: G 1/8 connection or G 1/4 connection female outlet;
— For device 20 ≤ DN ≤ 50: G 1/4 connection female outlet;
— For device DN > 50: G 1/2 connection female outlet;
or other technical means for the verification of the device, e.g. fast couplings or removable plugs.
9.5 Mechanical characteristics
9.5.1 General
Examples shown in the figures are for guidance only. Laboratory equipment shall be designed to ensure
that the device can be tested in accordance with the requirement.
If there is no other specification all tests shall be performed with water at maximum temperature 30 °C.
9.5.2 Mechanical resistance of the body under pressure
9.5.2.1 Requirement
There shall be no visual permanent deformation or rupture of the body or the internal parts of the device.
9.5.2.2 Procedure
— Apply at the inlet of the device in increments of 0,1 MPa (1 bar) per 5 s an increase of the static water
pressure up to 2,5 MPa (25 bar) for PN 10; ensure that the device is in flow position during the test.
This c
...
SLOVENSKI STANDARD
oSIST prEN 13434:2020
01-julij-2020
Naprave za varovanje pitne vode pred onesnaženjem zaradi povratnega toka -
Mehanski ločilniki s hidravličnim aktiviranjem - Družina G, tip B
Devices to prevent pollution by backflow of potable water - Mechanical disconnector,
hydraulic actuated - Family G, type B
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Rohrtrenner, durchflussgesteuert - Familie G, Typ B
Dispositifs de protection contre la pollution par retour de l’eau potable - Disconnecteur
mécanique assisté hydrauliquement - Famille G, type B
Ta slovenski standard je istoveten z: prEN 13434
ICS:
13.060.20 Pitna voda Drinking water
23.060.50 Blokirni ventili Check valves
oSIST prEN 13434:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 13434:2020
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oSIST prEN 13434:2020
DRAFT
EUROPEAN STANDARD
prEN 13434
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS 23.060.50
English Version
Devices to prevent pollution by backflow of potable water
- Mechanical disconnector, hydraulic actuated - Family G,
type B
Dispositifs de protection contre la pollution par retour Sicherungseinrichtungen zum Schutz des Trinkwassers
de l'eau potable - Disconnecteur mécanique assisté gegen Verschmutzung durch Rückfließen -
volumiquement - Famille G, Type B Rohrtrenner, durchflussgesteuert - Familie G, Typ B
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13434:2020 E
worldwide for CEN national Members.
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Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Denomination. 9
5 Designation . 9
6 Symbolization . 9
7 Physical-chemical characteristics. 10
7.1 General. 10
7.2 Materials . 10
7.2.1 General. 10
7.2.2 Dezincification resistant copper alloy . 10
7.3 Surface of the body . 10
7.3.1 General. 10
7.3.2 Epoxy Coating . 11
7.3.3 Polyamide Powder based Coating . 11
7.3.4 Other coatings . 11
8 Design . 11
8.1 General. 11
8.2 Relief valve/Obturator . 11
8.2.1 General. 11
8.2.2 Mechanical Disconnector Family G, Type B . 12
8.3 Disconnection distance . 12
9 Characteristics and tests . 12
9.1 General. 12
9.2 General tolerances . 12
9.2.1 Tolerance of set parameters . 12
9.2.2 Accuracy of measuring instruments . 12
9.3 Expression of the results . 12
9.4 Dimensional characteristics . 13
9.4.1 Connections . 13
9.4.2 Pressure tapping . 13
9.5 Mechanical characteristics . 13
9.5.1 General. 13
9.5.2 Mechanical resistance of the body under pressure . 14
9.5.3 Endurance . 14
9.5.4 Torque test of Captive rotating Nuts and Bending Strength – Tightness of the Body . 16
9.6 Leak tightness characteristics . 17
9.6.1 Verification of the leak tightness of the downstream check valve in closing direction
(and the pilot valve only mechanical disconnector Family G Type B) . 17
9.6.2 Verification of the leak tightness of check valve device (opening direction) . 17
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9.6.3 Verification of the leak tightness of the upstream spring loaded obturator in drain
position at low pressure (in the opening direction) . 18
9.7 Hydraulic characteristics . 19
9.7.1 Test rig— General circuit . 19
9.7.2 Verification of the pressure loss as a function of flow rate . 20
9.7.3 Verification of the opening and closing pressures of relief valve . 21
9.7.4 Verification of the relief valve flow rate . 21
9.8 Compatibility with the products used for shock disinfection of the networks . 22
9.8.1 Requirement . 22
9.8.2 Test method . 22
9.9 Acoustic tests . 22
9.9.1 General . 22
9.9.2 Procedure . 23
10 Order of testing . 23
11 Marking and technical documents . 24
11.1 General . 24
11.2 Marking . 24
11.3 Technical documents . 24
12 Presentation at delivery . 25
Annex A (informative) Examples of presentation of test results. 26
Bibliography . 29
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European foreword
This document (prEN 13434:2020) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
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Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this document:
1) this document provides no information as to whether the product may be used without restriction
in any of the member states of the EU or EFTA;
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.
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1 Scope
This document specifies, the dimensional, the physical-chemical, the design, the hydraulic, the
mechanical and the acoustic characteristics of mechanical disconnectors flow actuated Family G, type B.
This document is applicable to mechanical disconnectors flow actuated in nominal sizes DN 8 up to
DN 250, intended to prevent the return of water having lost its original sanitary and drinking qualities
(called “polluted water” in this document), into the potable water distribution system whenever the
pressure of the latter is temporarily lower than in the polluted circuit.
This document covers the mechanical disconnector of PN 10 that are capable of working without
modification or adjustment:
— at any pressure up to 1,0 MPa (10 bar);
— in permanent duty at a limit temperature of 65 °C and 90 °C for 1 h maximum.
It specifies also the test methods and requirements for verifying these characteristics, the marking and
the presentation at delivery.
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 806-1, Specifications for installations inside buildings conveying water for human consumption - Part
1: General
EN 1329-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the
building structure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes, fittings
and the systems
EN 1453-1, Plastics piping systems with structured-wall pipes for soil and waste discharge (low and high
temperature) inside buildings - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes
and the system
EN 1717:2000, Protection against pollution of potable water in water installations and general
requirements of devices to prevent pollution by backflow
EN 10310, Steel tubes and fittings for onshore and offshore pipelines - Internal and external polyamide
powder based coatings
EN 13959, Anti-pollution check valves - DN 6 to DN 250 inclusive family E, type A, B, C and D
EN 14901-1:2014+A1:2019, Ductile iron pipes, fittings and accessories - Requirements and test methods
for organic coatings of ductile iron fittings and accessories - Part 1: Epoxy coating (heavy duty)
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 3822-1, Acoustics - Laboratory tests on noise emission from appliances and equipment used in
water supply installations - Part 1: Method of measurement (ISO 3822-1)
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EN ISO 3822-3:2018, Acoustics - Laboratory tests on noise emission from appliances and equipment used
in water supply installations - Part 3: Mounting and operating conditions for in-line valves and appliances
(ISO 3822-3:1984)
EN ISO 6509-1, Corrosion of metals and alloys - Determination of dezincification resistance of copper
alloys with zinc - Part 1: Test method (ISO 6509-1)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1717, EN 806-1 and the
following 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 http://www.iso.org/obp
3.1
mechanical disconnector, flow actuated — Family G, type B
device, also referred to as “GB”, the characteristics of which are as follows:
— two pressure zones in flow position: upstream and downstream;
— three pressure zones in drain position (zero-flow): upstream, intermediate and downstream. The
upstream spring loaded obturator with discharge system and the downstream check valve separate
the intermediate zone from the upstream and downstream zone;
— the disconnector is actuated by a mechanical hydraulic valve
— at zero flow the disconnector is in drain position;
— flow position is achieved at a pressure difference ΔP ≥ 50 kPa (0,5 bar):
— a determined relief flow rate;
— a drain position visible directly or by a position indicator
Note 1 to entry: See Figure 1.
Note 2 to entry: For the purposes of this standard “Mechanical disconnector, flow actuated – Family G, type B”
are hereafter referred to as “device”.
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Key
1, 2, 3 pressure zones
D disconnection distance
Figure 1 — Design principle of Mechanical disconnector, flow actuated – Family G, type B
3.2
inlet pressure
p
1
pressure on upstream (inlet side, zone 1) of the device
3.3
intermediate pressure
p
i
pressure in the intermediate chamber of the device (in drain position p = p and under flow
i atm.
condition p = p ) (zone 3)
i 1
3.4
outlet pressure
p
2
pressure on the downstream (outlet side, zone 2) of the device
3.5
differential pressure
Δp
differential pressure between the inlet pressure p and the outlet pressure p
1 2
3.6
differential pressure
Δpf
differential pressure between the inlet pressure p and the outlet pressure p in flow position
1 2
Note 1 to entry: f = flow position
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3.7
differential pressure
Δpd
differential pressure between the inlet pressure p and the outlet pressure p in drain position
1 2
Note 1 to entry: d = drain position
3.8
set pressure
p
s
pressure at which the relief valve starts to open
3.9
disconnection distance
D
minimal vertical distance between the seat 1 of the relief valve and the seat 2 (see Figure 1) of the
upstream zone
4 Denomination
For the purpose of this document for the devices the nominal sizes DN is a function of the minimum
flow rate given in Table 4.
5 Designation
Mechanical disconnectors flow actuated Family G, Type B are designated by:
— name;
— reference to this document, EN 13434;
— family and type;
— nominal size;
— connection type;
— material of its body;
— surface finish (possible coatings);
— acoustic group (if applicable).
EXAMPLE Mechanical disconnector flow actuated, family G type B, DN 32, G 1 1/4 × G 1 1/4, brass, I,
EN 13434.
6 Symbolization
The graphic representation of the mechanical disconnector flow actuated Family G, Type B is as follows
(see Figure 2):
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Figure 2 — Graphic symbol design principle of Mechanical disconnector
7 Physical-chemical characteristics
7.1 General
The selection of materials is the responsibility of the manufacturer, provided they satisfy the following
requirements:
a) materials and coatings shall not contaminate the potable water;
b) in a technical document, the manufacturer shall state the nature of the materials and coatings used;
c) materials with inadequate corrosion resistance shall have additional protection;
d) the materials used shall be suitable for the temperatures specified in the tests in this Standard;
e) The materials, and in particular copper alloys, for which recommendations or international
standards exist, shall comply with the relevant European standards.
7.2 Materials
7.2.1 General
All materials coming into contact with water intended for human consumption shall present no health
risk nor cause any change to the water in terms of quality, appearance, smell or taste.
NOTE While awaiting the adoption of verifiable European criteria for testing materials in contact with water
intended for human consumption, existing national regulations concerning the use and/or the characteristics of
these products remain in force.
7.2.2 Dezincification resistant copper alloy
Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when submitted to
water capable of dezincification. In the countries where the use of products made of dezincification
resistant materials is required, the materials used shall guarantee a dezincification depth less than
200 μm in any direction. For this purpose materials shall be tested in accordance with the standard
EN ISO 6509-1 and the product shall be marked in compliance with the indications according to
Clause 11.
7.3 Surface of the body
7.3.1 General
The outside and inside surfaces of the device may or may not contain a coating. Such coating shall not
impair the functional characteristics of the device.
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The coating for protection of the basic material against corrosion can be either realized by epoxy
coating or by polyamide powder based coating.
7.3.2 Epoxy Coating
Epoxy Coating shall fulfil the requirements of and be tested in accordance with
EN 14901-1:2014+A1:2019 (see Table A.1 in Annex A).
7.3.3 Polyamide Powder based Coating
Polyamide powder shall fulfil the requirements of and be tested in accordance with EN 10310 (see
Table A.1 in Annex A).
7.3.4 Other coatings
If other coatings are used, they shall be tested according to the related coating standards and shall at
least perform the same quality as described in 7.3.2 and 7.3.3.
8 Design
8.1 General
a) The internal components of the device shall be accessible for inspection, repair or replacement. By
design, the components shall be able to be refitted at their initial place, without ambiguity
(impossibility of reversal, interchange of obturators, diaphragms, and springs). A visible mark is
not sufficient.
b) Additional control devices shall not influence the safety function.
c) The settings of the springs shall be fixed and not adjustable.
d) The device shall comprise one pressure tapping and a visible indication on the device when the
obturator is in the drain position. The pressure tapping is located on the inlet of the device.
e) Only the flow of water can operate the control of the internal components of the device.
8.2 Relief valve/Obturator
8.2.1 General
In all the installation positions indicated by the manufacturer, any water retention shall not be possible
within the intermediate zone.
The cross-section of the passage orifices and of the pilot tube for operation of the relief device shall be
2
equal to or greater than an area of 12,5 mm , In case of un-machined cross — sections the smallest
dimension should be ≥ 4 mm. The outside pilot tube shall be made so as not to be vulnerable to any
permanent deformation or rupture caused by external loading.
An air break to drain shall exist between any waste drain and any means of collecting the discharged
water (floor, tundish, curb, sink).
The device with an air break to drain fitted shall evacuate the full relief flow rate as defined in 9.7.4.
The air break to drain shall meet the dimensional requirements as specified in EN 1717.
This air break to drain shall be:
— either directly incorporated into the device;
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— or factory fitted;
— or supplied with the device.
In the latter case, the relief orifice of the device shall permit, neither the fitting of a standardized
threaded pipe, nor the connection of a standardized pipe or shape, be it by adhesive, welding or
interlocking.
If applicable on the dimension “G” of the outlet of the air break to drain (see in EN 1717:2000, Clause 9),
it shall be possible to fit a standardized drain pipe (Standard EN 1329-1 PVC compact and EN 1453-1
PVC with structured walls).
The opening of the drain shall be equal or larger than the outlet of the device.
8.2.2 Mechanical Disconnector Family G, Type B
At 0-flow or p ≤ 14 kPa (0,14 bar), the relief valve is in drain position. There shall be a visible
1
indication on the device when the obturator is in the drain position. The relief valve is controlled by a 3-
way differential pressure valve with on/off function.
8.3 Disconnection distance
In drain position the obturator shall close the opening from upstream zone to the intermediate zone.
The disconnection distance shall be at least 20 mm.
The drain port shall be closed, before flow condition is achieved. The passage orifice of the drain port
shall be at least equal to the minimum cross-section of the outlet water way (downstream).
9 Characteristics and tests
9.1 General
Performance tests shall be carried out on the device as installed in accordance with the manufacturer’s
technical documents.
If not specified all tests shall be performed with water at ambient temperature.
9.2 General tolerances
9.2.1 Tolerance of set parameters
In the absence of any particular specifications given in this document:
— flow rate and pressure: ± 2 % of the value specified;
— temperature: cold water ± 5 °C of the value specified; hot water ± 2 °C of the value specified;
10
— time: of the value specified.
+ %
0
9.2.2 Accuracy of measuring instruments
All the measuring instruments shall have an error limit of ± 2 % of the measured value.
9.3 Expression of the results
The measured values shall be registered. These results can be expressed as a curve. See Annex A for
example.
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9.4 Dimensional characteristics
9.4.1 Connections
The connections shall be in accordance with the relevant European Standards.
9.4.2 Pressure tapping
The device shall have a pressure tapping orifice in the upstream zone according to the indications as
shown in Figure 3 and Table 1.
The bores for pressure tapping shall have over their full depth a minimum cross-section area of
2
12,56 mm . Their smallest dimension shall be 4 mm.
Table 1 — Dimension of thread and test parts
Thread
a
DN
(designation in accordance
mm
with EN ISO 228-1)
≤ 15 G 1/8 or G 1/4 ≥ 6,5
20 ≤ DN ≤ 50 G 1/4 ≥ 6,5
> 50 G 1/2 ≥ 13
Key
G thread
a thread length
Figure 3 — Pressure tapping orifice
These pressure tappings shall be fitted with isolating valves:
— For devices DN ≤ 15: G 1/8 connection or G 1/4 connection female outlet;
— For device 20 ≤ DN ≤ 50: G 1/4 connection female outlet;
— For device DN > 50: G 1/2 connection female outlet;
or other technical means for the verification of the device e.g. fast couplings or removable plugs.
9.5 Mechanical characteristics
9.5.1 General
Examples shown in the figures are for guidance only. Laboratory equipment shall be designed to ensure
that the device can be tested in accordance with the requirement.
If there is no other specification all tests shall be performed with water at maximum temperature 30 °C.
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9.5.2 Mechanical resistance of the body under pressure
9.5.2.1 Requirement
There shall be no visual permanent deformation or rupture of the body or the internal parts of the
device.
9.5.2.2 Procedure
— Apply at the inlet of the device in increments of 0,1 MPa (1 bar) per 5 s an increase of the static
water pressure up to 2,5 times the PN rating, the value that equals 2,5 MPa (25 bar) for PN 10;
ensure that
...
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