SIST EN 13434:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch Rückfließen - Rohrtrenner, durchflussgesteuert - Familie G, Typ BDispositifs de protection contre la pollution par retour de l'eau potable - Disconnecteur mécanique assisté hydrauliquement - Famille G, type BDevices to prevent pollution by backflow of potable water - Mechanical disconnector, hydraulic actuated - Family G, type B91.140.60Sistemi za oskrbo z vodoWater supply systems23.060.50Blokirni ventiliCheck valves13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 13434:2006SIST EN 13434:2006en01-julij-2006SIST EN 13434:2006SLOVENSKI
STANDARD



SIST EN 13434:2006



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13434March 2006ICS 13.060.20; 23.060.50 English VersionDevices to prevent pollution by backflow of potable water -Mechanical disconnector, hydraulic actuated - Family G, type BDispositifs de protection contre la pollution par retour del'eau potable - Disconnecteur mécanique assistéhydrauliquement - Famille G, type BSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rückfließen - Rohrtrenner,durchflussgesteuert - Familie G, Typ BThis European Standard was approved by CEN on 16 December 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13434:2006: ESIST EN 13434:2006



EN 13434:2006 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Nominal size.7 5 Designation.8 6 Symbolization.8 7 Physico-chemical characteristics.8 7.1 Materials.8 7.2 Nature of the materials.9 8 Design.9 8.1 General.9 8.2 Relief valve.9 8.3 Disconnection distance.10 9 Characteristics and tests.10 9.1 General.10 9.2 General tolerances.10 9.3 Expression of the results.11 9.4 Dimensional characteristics.11 9.5 Mechanical characteristics.12 9.6 Leaktightness characteristics.15 9.7 Hydraulic characteristics.18 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.28
SIST EN 13434:2006



EN 13434:2006 (E) 3 Foreword This European Standard (EN 13434:2006) 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 September 2006, and conflicting national standards shall be with-drawn at the latest by September 2006. 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, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzer-land and United Kingdom. SIST EN 13434:2006



EN 13434:2006 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard: 1) this European Standard provides no information as to whether the product may be used without re-striction in any of the Member state 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. SIST EN 13434:2006



EN 13434:2006 (E) 5 1 Scope This European Standard specifies, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteristics of mechanical disconnector, hydraulic actuated Family G, type B. This European Standard is applicable to mechanical disconnectors hydraulic 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 European Standard), into the potable water distribution system whenever the pressure of the latter is temporarily lower than in the polluted circuit. This European Standard covers the mechanical disconnectors hydraulic actuated of PN 10 that are capable of working without modification or adjustment:  at any pressure up to 1 MPa (10 bar);  with any pressure variation up to 1 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 referenced documents are indispensable for the application of this European Standard. For da-ted references, only the edition cited applies. For undated references, the latest edition of the referenced do-cument (including any amendments) applies. EN 806-1:2000, Specifications for installations inside buildings conveying water for human consumption — Part 1: General EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN desig-nated — Part 1: Steel flanges EN 1092-2, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN desig-nated — Part 2: Cast iron flanges EN 1717:2000, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow EN 13959, Anti-pollution check valves DN 6 to DN 250 inclusive family E, type A, B, C and D EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 3822-1, Acoustics — Laboratory tests on noise emission from appliances and equipment used in wa-ter supply installations — Part 1: Method of measurement (ISO 3822-1:1999) EN ISO 3822-3:1997, 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 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1:2003) SIST EN 13434:2006



EN 13434:2006 (E) 6 EN ISO 6509, Corrosion of metals and alloys — Determination of dezincification resistance of brass (ISO 6509:1981) ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the following apply. 3.1 mechanical disconnector, hydraulic actuated — Family G, type B specific characteristics of this device called “GB”, (see Figure 1) 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;  at zero flow the disconnector is in drain position;  the relief valve start opening at a pressure difference between upstream and downstream zone ∆p ≥ 14 kPa (0,14 bar);  flow position is achieved at a pressure difference ∆p < 100 kPa (1 bar):  a determined relief flow rate;  a drain position visible directly or by a position indicator
Figure 1 — Design principle SIST EN 13434:2006



EN 13434:2006 (E) 7 3.2 inlet pressure, p1 pressure on the inlet side of the device 3.3 intermediate pressure, pi pressure in the intermediate chamber of the device (in drain position pi = patmosph. under flow condition pi = p1) 3.4 outlet pressure, p2 pressure on the outlet side of the device 3.5 differential pressure ∆p differential pressure between the inlet pressure p1 and the outlet pressure p2 3.5.1 differential pressure, ∆pf (f = flow position) differential pressure between the inlet pressure p1 and the outlet pressure p2 in flow position 3.5.2 differential pressure, ∆pd (d = drain position) differential pressure between the inlet pressure p1 and the outlet pressure p2
in drain position 3.6 set pressure ps pressure at which the relief valve starts to open 3.7 disconnection distance minimal distance between the seat of the relief valve and the seat of the upstream obturator where the dis-connection is operated NOTE For the purposes of this European Standard «Mechanical disconnector, hydraulic actuated – Family G, type B» is hereafter referred to as «device».
4 Nominal size The nominal size of the device is given in Table 1: Table 1 — DN versus threads and flanges Nominal size DN 8 10 15 20 25 32 40 50 65 80 100 125 150 200 250Threads (designation in accordance with ISO 7-1) G ¼ G ê
G ½ G ¾ G 1 G 1 ¼ G 1 ½ G 2
Flanges (DN)
40 50 65 80 100 125 150 200 250 SIST EN 13434:2006



EN 13434:2006 (E) 8 5 Designation A mechanical disconnector hydraulic actuated Family G, Type B is designated by:  name;  reference to this European Standard, i.e. EN 13434.  family and type;  nominal size (see Table 1);  connection type;  material of its body;  surface finish (possible coatings);  acoustic group (if applicable). EXAMPLE of designation Mechanical disconnector EN 13434, Family G, Type B, DN 32, G 1¼ × G 1¼, cast iron, epoxy coated, I. 6 Symbolization The graphic representation of the mechanical disconnector hydraulic actuated Family G, Type B is as follows (see Figure 2):
Figure 2 — Graphic symbol 7 Physico-chemical characteristics 7.1 Materials The materials and the coatings used, liable to come normally or accidentally in contact with potable water, shall satisfy the EU regulations concerning water quality. The materials and the coatings shall be: a) corrosion resistant; b) prone to the least scaling possible; c) in conformity with the European Standards and regulations; d) compatible among themselves and: SIST EN 13434:2006



EN 13434:2006 (E) 9 1) with the water supply; 2) with the fluids or matter liable to come into contact with them; 3) with the products normally used for disinfection of the water distribution system: potassium perman-ganate and sodium hypochlorite. 7.2 Nature of the materials a) The choice of materials is left to the discretion of the manufacturer. 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 products have to guarantee a dezincification depth less than 200 µm in any direction, they have to be tested in accordance with EN ISO 6509 and have to be marked in compliance with the indications in Clause 11; NOTE
This European Standard does not cover non-metallic materials for bodies. b) neither the materials nor the coatings used shall, by normal or accidental contact with drinking water, cause any risk of affecting or modifying the water up to a temperature of 90 °C. The suitability of the water for human consumption is defined by national regulations; c) the manufacturer shall state in his technical and sales literature the nature of the materials and the coat-ings selected; d) the materials, and in particular copper alloys, for which recommendations or International Standard exists shall comply with the relevant recommendations or International Standards. 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, springs, .). A visible mark is not sufficient. b) Additional control devices (electrical, pneumatic etc.) 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 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 At 0-flow or p1 ≤ 14 kPa (0,14 bar), the relief valve is in drain position. There shall be a visible 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. In all the installation positions indicated by the manufacturer, any water retention shall not be possible within the intermediate zone. SIST EN 13434:2006



EN 13434:2006 (E) 10 The cross-section of the passage orifices and of the pilot tube for operation of the relief device shall be equal to or greater than an area of 12,5 mm2, except with DN < 15 for control drillings with a length of less than 20 mm which shall have a minimum internal diameter of 2 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. The cross-sections of the passage orifice for the impulse pipe of devices DN < 15 shall be greater than an area of 3,14 mm2 (D min > 2 mm). 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 without spilling to the outside. 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. 8.3 Disconnection distance In drain position the obturator shall close the opening from upstream zone to the intermediate zone. The dis-connection 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 tech-nical documents. If not specified all tests shall be performed with water at an ambient temperature. 9.2 General tolerances 9.2.1 Tolerance on set values In the absence of any particular specifications given in this European Standard: SIST EN 13434:2006



EN 13434:2006 (E) 11  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: %100+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 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 conformity with the following standards:  EN ISO 228-1;  ISO 7-1;  EN 1092-1;  EN 1092-2. Devices with threaded connections shall be capable of removal without altering the pipework e.g. by means of a coupling nut or union. 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 2. The bores for pressure tapping shall have over their full depth a minimum cross-section area of 12,56 mm2. Their smallest dimension shall be 4 mm. Table 2 — Dimension of thread and test parts DN Thread (designation in accordance with ISO 7-1) a mm ≤ 10 G 1Ú8 ≥ 6,5 10 < DN ≤ 50 G ¼ ≥ 6,5 > 50 G ½ ≥ 13
SIST EN 13434:2006



EN 13434:2006 (E) 12
Key G thread a test part Figure 3 — Pressure tapping orifice These pressure tappings shall be fitted with test cocks:  DN 6 (G é connection) female outlet for devices DN ≤ 10;  DN 8 (G ¼ connection) female outlet
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