EN 14367:2005

SLOVENSKI STANDARD
01-december-2005
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Non controllable backflow preventer with different pressure zones - Family C, type A
Systemtrenner mit unterschiedlichen nicht kontrollierbaren Druckzonen - Familie C, Typ
A
Disconnecteur non contrôlable a zones de pression différentes - Famille C, type A
Ta slovenski standard je istoveten z: EN 14367:2005
ICS:
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14367
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2005
ICS 91.140.60
English Version
Non controllable backflow preventer with different pressure
zones - Family C, type A
Disconnecteur à zones de pression différentes non Systemtrenner mit unterschiedlichen nicht kontrollierbaren
contrôlables - Famille C - type A Druckzonen - Familie C, Typ A
This European Standard was approved by CEN on 3 February 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14367:2005: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
3.2 Specific use .7
4 Nominal size (denomination).7
4.1 Class a device .7
4.2 Class b device.7
5 Designation .7
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
9 Characteristics and test methods.10
9.1 General.10
9.2 General tolerances.10
9.3 Expression of the results.11
9.4 End connections.11
9.5 Mechanical characteristics .11
9.6 Tightness characteristics .15
9.7 Hydraulic characteristics .18
10 Order of testing.23
11 Marking and technical documents.23
11.1 Marking .23
11.2 Technical documents .24
12 Presentation at delivery .24
Annex A (normative) Complementary test methods on backflow preventers CA class b with a
plastic body.25
Annex B (informative) Examples of presentation of test results.28

Foreword
This document (EN 14367:2005) 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 December 2005, and conflicting national standards shall be withdrawn
at the latest by December 2005.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland and
United Kingdom.
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.
1 Scope
This document specifies the:
field of application;
the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteris-
tics of non-controllable backflow preventer with different pressure zones, family C, type A, nominal sizes DN 6
to DN 50, nominal pressure PN 10.
It is applicable to:
 Family C, type A, class "a" for general use: devices of class "a" shall be capable of working:
at any pressure up to 1 MPa (10 bar);
with any pressure variation up to 1 MPa (10 bar);
at a supply temperature limit of 65 °C and 90 °C for 1 h;
 Family C, type A, class "b" for specific use: devices of class "b" shall be capable of working:
at any downstream pressure up to 0,3 MPa (3 bar);
with any downstream pressure variation up to 0,3 MPa (3 bar);
The devices of class "b" having specific hydraulic and no acoustic requirements and are meant for equipped
filling devices built-in one or two functions boilers (heating only or heating and production of sanitation hot wa-
ter).It concerns boilers with a 70 kW maximum power and maximum temperature of 110°C.
It specifies also:
 test methods and requirements for verifying these characteristics;
 marking;
 presentation and the delivery.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated refer-
ences, only the edition cited applies. For undated references the latest edition of the referenced document
(including any amendments) applies.
EN 1254-4, Copper and copper alloys — Plumbing fittings — Part 4: Fittings combining other end connections
with capillary or compression ends.
EN 1267:1999, Valves-Test of flow resistance using water as test fluid.
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 3822-1:1999, Acoustics — Laboratory tests on noise emission from appliances and equipment used
in water 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 .
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).
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, toler-
ances and designation.
ISO 965-1, ISO general-purpose metric screw threads -- Tolerances -- Part 1: Principles and ba-
sic data .
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1717:2000 and the following apply.
3.1
non controllable backflow preventer with different pressure zones — Family C — Type A
the specific characteristics of this device called “CA”, are as follows:
The device is divided into three zones:
 one upstream zone p ;
 one intermediate zone (p not measurable) vented to the atmosphere;
i
 one downstream zone p .
The device provides disconnection by venting the intermediate pressure zone to the atmosphere when the
difference of pressure between the intermediate zone and the upstream zone is less than 10 % of the up-
stream pressure (p – p < 10 % p ).
1 1
i
It ensures a discharge (backflow rate) through the intermediate zone, at least equal to the given discharge
flow rate.
Means for the control of the protection device are not included.
Key
1 upstream zone p
2 intermediate zone p
i
3 downstream zone p
Figure 1 — Design principle
For the purposes of this standard “Non controllable backflow preventer with different pressure zones —
Family C — Type A” is hereafter referred to as «device».
3.2 Specific use
Specific use is related to use the backflow protection device at the filling point of domestic sealed heating sys-
tems.
4 Nominal size (denomination)
4.1 Class a device
The denomination of the device is given in Table 1:
Table 1 — DN versus threads of Class a device
Denomination DN 6 8 10 15 20 25 32 40 50
Threads of tailpieces G1/8 G1/4 G3/8 G1/2 G3/4 G1 G1 1/4 G1 1/2 G2

4.2 Class b device
The denomination of this device is not related to the size of connection. All Class b devices shall comply with
the same performances requirements.
5 Designation
A non controllable backflow preventer with different pressure zones family C, type A is designated by:
 family, its type and class;
 denomination (see Table 1) except class b device;
 connection type;
 material of its body;
 surface finish (possible coating);
 acoustic group (for DN ≤ 32) except class b device;
 reference t
...