oSIST prEN 13433:2020

Devices to prevent pollution by backflow of potable water - Mechanical disconnector, direct actuated - Family G, type A

This document specifies the dimensional, physical-chemical, design, hydraulic, mechanical and acoustic characteristics of mechanical disconnectors, direct actuated Family G, type A.
This document is applicable to mechanical disconnectors 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);
- with any pressure variation 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, nicht durchflussgesteuert - Familie G, Typ A

Dieses Dokument legt die maßlichen und physikalisch-chemischen Anforderungen, die Anforderungen an die Konstruktion, die hydraulischen, mechanischen und akustischen Anforderungen an nicht durchfluss-gesteuerte Rohrtrenner, Familie G, Typ A, fest.
Dieses Dokument gilt für mechanische 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 PN 10, die ohne Abänderung oder Nachstellung funktionsfähig sind:
- bei jedem Druck bis 1,0 MPa (10 bar);
- bei jeder Druckschwankung 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 à action directe - Famille G, type A

Le présent document spécifie les caractéristiques dimensionnelles, physico-chimiques, de conception, hydrauliques, mécaniques et acoustiques des disconnecteurs mécaniques à action directe de famille G, type A.
Le présent document s’applique aux disconnecteurs mécaniques 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) ;
- pour toute variation de 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 z neposrednim aktiviranjem - Družina G, tip A

General Information

• Status: Not Published
• Public Enquiry End Date: 19-May-2020
• ICS: 13.060.20 - Drinking water
• ICS: 23.060.50 - Check valves
• ICS: 91.140.60 - Water supply systems
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 18-May-2020
• Due Date: 05-Oct-2020
• Completion Date: 25-May-2020
• Ref Project: FprEN 13433 - Devices to prevent pollution by backflow of potable water - Mechanical disconnector, direct actuated - Family G, type A

RELATIONS

• Revised: SIST EN 13433:2006 - Devices to prevent pollution by backflow of potable water - Mechanical disconnector, direct actuated - Family G, type A
• Effective Date: 01-Jun-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 13433:2020
01-junij-2020
Naprave za varovanje pitne vode pred onesnaženjem zaradi povratnega toka -
Mehanski ločilniki z neposrednim aktiviranjem - Družina G, tip A

Devices to prevent pollution by backflow of potable water - Mechanical disconnector,

direct actuated - Family G, type A
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Rohrtrenner, nicht durchflussgesteuert - Familie G, Typ A

Dispositifs de protection contre la pollution par retour de l’eau potable - Disconnecteur

mécanique à action directe - Famille G, type A
Ta slovenski standard je istoveten z: prEN 13433
ICS:
13.060.20 Pitna voda Drinking water
23.060.50 Blokirni ventili Check valves
91.140.60 Sistemi za oskrbo z vodo Water supply systems
oSIST prEN 13433:2020 en,fr,de

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

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oSIST prEN 13433:2020
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oSIST prEN 13433:2020
DRAFT
EUROPEAN STANDARD
prEN 13433
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS 23.060.50 Will supersede EN 13433:2006
English Version
Devices to prevent pollution by backflow of potable water
- Mechanical disconnector, direct actuated - Family G, type

Dispositifs de protection contre la pollution par retour Sicherungseinrichtungen zum Schutz des Trinkwassers

de l'eau potable - Disconnecteur mécanique à action gegen Verschmutzung durch Rückfließen -

directe - Famille G, Type A Rohrtrenner, nicht durchflussgesteuert - Familie G, Typ

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 13433:2020 E

worldwide for CEN national Members.
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oSIST prEN 13433:2020
prEN 13433:2020 (E)
Contents Page

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

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

7.2.1 Dezincification resistant copper alloy .................................................................................................... 9

7.3.1 General................................................................................................................................................................ 9

7.3.2 Epoxy Coating ................................................................................................................................................. 10

7.3.3 Polyamide Powder based Coating .......................................................................................................... 10

8.2.1 General.............................................................................................................................................................. 10

8.2.2 Mechanical Disconnector Family G, Type A ......................................................................................... 11

9.2.1 Tolerance of set parameters ..................................................................................................................... 11

9.2.2 Accuracy of measuring instruments ...................................................................................................... 11

9.3.1 Connections ..................................................................................................................................................... 11

9.3.2 Pressure taps .................................................................................................................................................. 11

9.4.1 General.............................................................................................................................................................. 12

9.4.2 Mechanical resistance of the body under pressure .......................................................................... 12

9.4.3 Endurance ........................................................................................................................................................ 13

9.4.4 Torque test of Captive rotating Nuts and Bending Strength – Tightness of the Body .......... 14

9.5.1 Verification of the leak tightness of the downstream check valve in closing direction ...... 15

9.5.2 Verification of the leak tightness of check valve device (opening direction) ......................... 15

9.5.3 Verification of the leak tightness of the upstream spring loaded obturator in drain

position at low pressure (in the opening direction) ........................................................................ 16

9.6.1 Test rig – General circuit ............................................................................................................................ 17

9.6.2 Verification of the pressure loss as a function of flow rate ........................................................... 18

9.6.3 Verification of the opening and closing pressures of relief valve ............................................... 19

9.6.4 Verification of the relief valve flow rate ............................................................................................... 19

9.6.5 Compatibility with the products used for disinfection of water distribution systems ....... 20

9.6.6 Acoustic tests .................................................................................................................................................. 20

Annex A (informative) Examples of presentation of test results ................................................................ 24

Bibliography ................................................................................................................................................................. 27

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oSIST prEN 13433:2020
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European foreword

This document (prEN 13433:2020) 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.
This document will supersede EN 13433:2006.
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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 can 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, physical-chemical, design, hydraulic, mechanical and acoustic

characteristics of mechanical disconnectors, direct actuated Family G, type A.

This document is applicable to mechanical disconnectors 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);
— with any pressure variation 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 3822-3:2018)

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 http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
mechanical disconnector, direct actuated — Family G, type A
device, also referred to as "GA", the characteristics of which are as follows:

— two pressure zones in flow position: upstream (zone 1) and downstream (zone 2);

— two pressure zones in zero flow position (static): upstream (zone 1) and downstream (zone 2),

check valve closed;

— three pressure zones in drain position: upstream (zone 1) and downstream (zone 2) and

intermediate zone (zone 3) at atmospheric pressure;

— the upstream spring loaded obturator with discharge system and the downstream (zone 2) check

valve separate the intermediate zone (zone 3) from the upstream (zone 1) and downstream zone

(zone 2);
— flow position is achieved at a pressure p ≥ p + 50 kPa (0,5 bar);
f s
— the relief valve starts opening at the set pressure p ≥ p + 50 kPa (0,5 bar);
s stat
— drain position is achieved at a pressure p ≥ p − 36 kPa (0,36 bar);
0 s
— 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, direct actuated — Family G,

type A” 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, direct actuated – Family G, type A

3.2
inlet pressure
pressure on upstream (inlet side, zone 1) of the device
3.3
intermediate pressure

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
pressure on the downstream (outlet side, zone 2) of the device
3.5
differential pressure
differential pressure between the inlet pressure p and the outlet pressure p
1 2
3.6
static pressure
stat

pressure equivalent to the height of the water column between the highest draw-off point and the

horizontal axis of the installed disconnector
3.7
set pressure
pressure at which the relief valve starts to open
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3.8
opening pressure
pressure at which the disconnection distance of ≤ 20 mm is reached
3.9
closing pressure
pressure at which the relief valve is fully closed
3.10
disconnection distance

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 5.
5 Designation
Mechanical disconnectors direct actuated family G, type A are designated by:
— name;
— reference to this document, EN 13433;
— family and type;
— nominal size;
— connection type;
— material of its body;
— surface finish (possible coatings);
— acoustic group (if applicable).

EXAMPLE Mechanical disconnector direct actuated family G type A, DN 32, G 1 1/4 × G 1 1/4, brass, I,

EN 13433.
6 Symbolization

The graphic representation of the mechanical disconnector direct actuated, Family G, Type A 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.

The coating for protection of the basic material against corrosion can be either realized by epoxy

coating or by polyamide powder based coating.
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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).
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) The settings of the springs shall be fixed and not adjustable.

c) 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.

d) Only the pressure of the water of the supply system at the inlet can operate the control of the

internal components of the device.
8.2 Relief valve/Obturator
8.2.1 General
Any water retention shall not be possible within the intermediate zone.

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 9.6.4.

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, 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).
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8.2.2 Mechanical Disconnector Family G, Type A

Under normal service conditions at p > p the relief valve is closed. At an inlet pressure of p ≤ p the

1 s 1 s

relief valve starts opening and at a pressure of p ≤ p the relief valve is in drain position. There shall be

1 o

a visible indication on the device, when the obturator is in the drain position, any water retention shall

not be possible within the intermediate zone.
8.3 Disconnection distance

In drain position the obturator shall close the opening from upstream zone to the intermediate zone.

The disconnection distance D shall be at least 20 mm (see Figure 1).

The relief valve shall be closed, before flow condition is achieved. The passage orifice of the relief

valve 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;

— time: + of the value specified.
9.2.2 Accuracy of measuring instruments

Instruments for measuring temperature shall be accurate to 1 °C. All other measuring instruments shall

have an error limit of ± 2 % of the measured value.
9.3 Dimensional characteristics
9.3.1 Connections
The connections shall be in accordance with the relevant European Standards.
9.3.2 Pressure taps

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

12,56 mm . Their smallest dimension shall be 4 mm.
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Table 1 — Dimension of thread and test parts
Thread
(designation in accordance with
EN ISO 228-1)
≤ 10 G 1/8 > 6,5
10 ≤ DN ≤ 50 G 1/4 > 6,5
> 50 G 1/2 > 13
Key
G thread
a minimum thread length of test par
Figure 3 — Pressure tapping orifice
These pressure tappings shall be fitted with isolating valves:
— DN 6 (G 1/8 connection) female outlet for devices DN ≤ 10;
— DN 8 (G 1/4 connection) female outlet for devices 10 < DN ≤ 50;
— DN 15 (G 1/2 connection) female outlet for device DN > 50;

or other technical means for the verification of the device e.g. fast couplings or removable plugs.

9.4 Mechanical characteristics
9.4.1 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 potable water at maximum

temperature 30 °C.
9.4.2 Mechanical resistance of the body under pressure
9.4.2.1 Requirement

There shall be no visual permanent deformation or rupture of the body or the internal parts of the

device. 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).

— Hold this pressure for 5 min. and observe the device and note any observations.

Verify that the device satisfies the requirement of 9.4.2.1.
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9.4.3 Endurance
9.4.3.1 Requirement

a) The endurance test shall be done with the same sample that has been tested according to the

clauses 9.5.1, 9.5.2, 9.5.3., 9.6.3 and 9.6.5. After performing the test according to Clause 9.4.3.2. The

sample shall fulfil the requirements according to clauses 9.5.1, 9.5.2, 9.5.3 and 9.6.3.

b) There shall be no visible damages or deformation of the coating, and of components.

9.4.3.2 Procedures
Test 1 — Behaviour at temperature.

Place the complete device for 72 h in an environment at a temperature of 65 °C, and at a relative

humidity of (50 ± 10) %.
Test 2 — Thermal shock.

Following the preceding test, put the complete device at the flow rate as given in the Table 4, supplying

it with water at 90 °C.

Once temperature reaches 85 °C at the outlet of the device, hold the flow rate for 60 min, and then

supply for 10 min with water at 15 °C.
Test 3 — Mechanical endurance
A Supply pressure: (0,3 ± 0,03) MPa (3 ± 0,3) bar
B Supply pressure: (1 ± 0,05) MPa (10 ± 0,5) bar
Key
1, 2, 3, 4 valve with time control of opening and closing
5 adjusting valve
Figure 4 — Endurance testing equipment

Following the preceding test 1 and test 2 submit the device placed in the test equipment (see Figure 4 to

+ 50

5 000 cycles cycles at a temperature of 40 °C with a flow rate given in Table 2 ± 5 % (adjust with

valve 5), each cycle comprising:
— stage 1: open valves 1 and 4; flow condition;
— stage 2: close valves 1 and 4;

— stage 3: open valve 1, static pressure of 0,3 MPa (3 bar) for (6 ± 2) s; static condition at 3 bar;

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— stage 4: close valve 1, open valve 3; Upstream drain for 2 s; Disconnection;
— stage 5: close valve 3;
— stage 6: open valve 4; downstream drain to atmospheric pressure;

— stage 7: open valve 1; circulation at a flow rate given in Table 2 at the value ± 5 % for (6 ± 2) s;

— stage 8: close valve 4 and 1;
— stage 9: open valve 2, static pressure of 1 MPa (10 bar) for (6 ± 2) s;

— stage 10: close valve 2 and open valve 3, Upstream drain for 2 s; Disconnection;

— stage 11: close valve 3, open valve 4
+50
— continue with stage 1 until 5 000 cycles are achieved.
Table 2 — Nominal size versus endurance test flow rate
Type DN 8 10 15 20 25 32 40 50 65 80 100 125 150 200 250
Flow
GA rate 0,4 0,6 1,3 2,2 3,5 5,8 9 14 24 35 56 56 56 56 56
m /h

At the end of test 3, verify that the device satisfies the requirements of 9.4.3.1.

9.4.4 Torque test of Captive rotating Nuts and Bending Strength – Tightness of the Body

9.4.4.1 Requirement
a) After unscrewing, no visual damage of the nut shall be detected.

b) There shall be no rupture nor permanent deformation or leakage on the body of the device. The test

shall be carried out under the conditions defined in 9.4.4.2.
9.4.4.2 Test method

The device shall be fixed to the test rig, into operating orientation, as shown in Figure 5, captive rotating

nut connection shall be tightened with the torque specified in Table 3. Gradually apply torque to the

captive rotating nut/backnut until the tightening torque is reached and maintain it for a period of at

least 1 min.

Once it is in water under pressure and without bending stress, the fitting shall be leaktight. In case it is

not leaktight, the tightening torque can be increased.

Apply a load W as shown in Figure 5 corresponding to the bending moment shown in Table 4. Apply

pressure up to 1,6 MPa (16 bar) with increments of 0,1 MPa (1 bar) per 5 s.

Maintain bending moment and pressure for 10 min. When calculating load W corresponding to the

bending moment, loads introduced by the piping and taps and any loads coming from the test apparatus

shall be accounted for.
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oSIST prEN 13433:2020
prEN 13433:2020 (E)
Table 3 — Tightening torque
Nominal size DN 15 20 25 32 40 50
Tightening torque (Nm) 60 75 100 125 150 150
Key
W load
Figure 5 — Bending moment testing equipment
Table 4 — Nominal size versus bending moment
Nominal
8 10 15 20 25 32 40 50 65 80 100 125 150 200 250
size DN
Bending
1 30 1 80 2 40 3 80 5 50
Moment 30 40 70 110 150 250 300 500 750 950
0 0 0 0 0
(Nm)
Verify that the device satisfies the requirements of 9.4.4.
9.5 Leak tightness characteristics

9.5.1 Verification of the leak tightness of the downstream check valve in closing direction

9.5.1.1 Requirement

Under the test conditions described in 9.5.1.2, the device shall show no leakage, nor permanent

deformation or deterioration.
9.5.1.2 Procedure

Downstream of the device, apply a pressure of 1,6 MPa (16 bar) with water at maximum 30 °C, the

upstream zone and intermediate zone being at atmospheric pressure. The pressure is to be applied in

increments of 0,1 MPa (1 bar) per 5 s until 1,6 MPa (16 bar) is reached.
Isolate the device from the supply system and hold the pressure for 10 min.
Verify that the device satisfies the requirements of 9.5.1.1.

9.5.2 Verification of the leak tightness of check valve device (opening direction)

9.5.2.1 Requirement

The closing pressure of the check valve shall be greater than 7 kPa (70 mbar). If a check valve EB

conforming to EN 13959 is incorporated, the closing pressure shall be greater than 0,5 kPa (5 mbar).

The differential pressure shall be constant for minimum of 5 min.
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oSIST prEN 13433:2020
prEN 13433:2020 (E)
a) b)
Figure 6 — Test equipment for verifying closing pressure
9.5.2.2 Procedure

The verification is made with the device fixed in the flow position by measuring the differential

pressure between the upstream and downstream zone (Figure 6).
Keep the obturator in flow position.
Admit water to the device and fix it in flow position.
Isolate the device for 5 min + 30 s from water
...