SIST EN 14367:2005

SLOVENSKI STANDARD
SIST EN 14367:2005
01-december-2005
6LVWHPVNLORþHYDOQLN]UD]OLþQLPLQHQDG]RURYDQLPLREPRþMLWODND±'UXåLQD&WLS$
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
SIST EN 14367:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14367:2005

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SIST EN 14367:2005
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.

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SIST EN 14367:2005
EN 14367:2005 (E)
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

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SIST EN 14367:2005
EN 14367:2005 (E)
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.
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EN 14367:2005 (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.
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EN 14367:2005 (E)
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.
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EN 14367:2005 (E)
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 ;
1
 one intermediate zone (p not measurable) vented to the atmosphere;
i
 one downstream zone p .
2
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.
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Key
1 upstream zone p
1
2 intermediate zone p
i
3 downstream zone p
2
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;
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 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 to the present standard.
EXAMPLE for a designation:
class a:
 Non controllable backflow preventer with different pressure zones, EN 14367, family C, type A, class a,
DN 20, G3/4 × G3/4, bronze, I,
class b:
 Non controllable backflow preventer with different pressure zones, EN 14367, family C, type A, class b,
M10 × 1, brass,
6 Symbolization
The graphic representation of the non controllable backflow preventer with different pressure zones —
family C, type A is as follows:

2 a) Class a                           2 b) Class b
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 EC regulations concerning water quality.
And therefore, they:
 shall be corrosion resistant;
 shall be prone to the least scaling possible;
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 shall be in conformity with the European Standards and regulations;
 shall be compatible among themselves; and
with the water distributed;
with the fluids or matter liable to come into contact with them;
with the products normally used for disinfection operations of the network: potassium permanganate and so-
dium hypochlorite.
7.2 Nature of the materials
a) The choice of materials is left to the discretion of the manufacturer.
b) 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 the standard EN ISO 6509 and
have to be marked in compliance with the indications under clause «Marking»;
c) 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 (see also clause 1).
The suitability of the water for human consumption is defined by national regulations;
d) the manufacturer shall state in his technical and sales literature the nature of the materials and the
coatings selected;
e) the materials, and in particular copper alloys, for which recommendations or international standard ex-
ists shall comply with the relevant recommendations or international standards;
f) the devices whose whole body or part of it is made of plastic shall, in addition to the tests referred to
in this standard, be submitted to complementary tests described in annex A.
8 Design
8.1 General
a) Only the pressure of the water (upstream and/or downstream): shall have an affect of the function of
components of the device;
b) the settings of the springs shall be fixed and not adjustable;
c) as regards devices designed in such a way that the access to the internal parts is possible (for inspection,
repair or replacement), these components shall be able to be refitted at their initial place without ambigu-
ity (impossibility of reversal, interchange of obturators, diaphragms, springs, …). A visible mark is not suf-
ficient.
8.2 Relief valve
If the relief valve system operates by means of pilot tube then the cross section of the pilot tube shall be equal
2 2
to or greater than 45 mm for devices DN > 15 or 12,5 mm for devices DN ≤ 15 no dimension being less than
4 mm.
2
The water passage through the discharge orifice shall have a cross-section of minimal 12,5 mm .
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The smallest dimension used to calculate this cross-section shall not be inferior to 4 mm for non-moving part.
The control of the relief valve shall be of positive safety, i.e. in case of rupture or leakage, the relief shall be
open.
This will be checked by examination of the behaviour of the device, after dismantling the control system of the
relief valve (diaphragm, piston seal …).
An air break to drain shall be placed at the discharge outlet. An air gap shall exist between any waste drain
and any means to collect the discharged water (floor, tundish, curb, sink …).
The device shall be capable, by design, evacuating the full relief flow rate as defined in 9.6.4 without spilling to
the outside of the air break to drain.
Class a device shall be equipped with:
The air break to drain shall meet the dimensional requirements of chapter 9 of EN 1717:2000.
This air break to drain shall be:
 either directly incorporated into the device;
 or factory fitted;
 or supplied with the device.
In the last two cases, the relief valve outlet of the device shall permit neither fitting of a standardized threaded
pipe, nor the connection by the inside of a standardized pipe or shape, be it by glue, welding or interlocking.
Class b device shall be equipped with:
2
 At least two air inlets openings with each a minimum cross-section of 12,5 mm upstream of the relief pip-
ing shall be incorporated.
The smallest dimension used to calculate this cross-section shall not be less than 4 mm.
 A discharge construction allowing fitting of a standardized threaded or plain pipe without disturbing the
working of the relief valve system and without obturating, even partially, the air inlets opening.
9 Characteristics and test methods
9.1 General
Performance tests shall be carried out on the device as installed in accordance with the manufacturer’s tech-
nical documents.
9.2 General tolerances
9.2.1 Accuracy of measurements
In the absence of any particular specifications:
 flow rate and pressure : ± 2 % of the value specified;
 temperature : cold water ± 5 K of the value specified;
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 hot water ± 2 K 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 accuracy 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 B for
example.
9.4 End connections
9.4.1 Threaded end connections
Devices with threaded connections shall be able to be dismounted without any damage to the piping.
Example: coupling nut, union.
9.4.1.1 Class a device
The connections shall be in conformity with EN 1254-4, EN ISO 228-1 and ISO 7-1.
9.4.1.2 Class b device
The connections of the device for separate installation and for integrated purposes shall be M10 × 1 (in accor-
dance with ISO 965-1). For integrated purposes other connections are also permitted.
9.5 Mechanical characteristics
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 requirements.
9.5.1 Mechanical resistance of the body under pressure
9.5.1.1 Requirement
No visual permanent deformation or rupture of the body or the internal parts of the device shall occur.
The test shall be carried out under the conditions defined in 9.5.1.2.
9.5.1.2 Test method
 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 value, this equals 2,5 MPa (25 bar);
 Hold this pressure for 5 min. Observe the device and note any observations.
 Verify that the device satisfies the requirement of 9.5.1.1.
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9.5.2 Bending strength — Tightness of the body
9.5.2.1 Requirement
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 9.5.2.2.
9.5.2.2 Test method
Fasten the device onto the test bench with the supplied connections (special unions are not allowed). Apply a
load W as shown in Figure 3 corresponding to the bending moment shown in Table 2 (in this particular case
class b device shall satisfy the DN 6 requirements), with a pressure of 1,6 MPa (16 bar) applied in increments
0,1 MPa (1 bar) per 5 s. Maintain the bending moment and the pressure for 10 min.
When calculating the 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.
Verify that the device satisfies the requirement of 9.5.2.1.
Dimensions in metres

Key
1,2 Isolating valve
3 W Load
Figure 3 — Bending moment testing equipment
Table 2 — Nominal size versus bending moment
DN  6  8 10 15  20  25  32  40  50
Bending moment Nm 10 30 40 80 150 300 400 500 600

9.5.3 Endurance
9.5.3.1 Requirement
a) No leakage through the relief valve shall be observed throughout the test.
b) The device shall not show any particular defects (coating, …), whilst visually inspecting without any dis-
mantling operation
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c) Without replacement of any component, the device shall be in good working condition to be verified by
the remaining tests (clause 10).
9.5.3.2 Test method
The tests 1 and 2 apply to the both class a and class b devices. Test 3a applies to class a device only, test 3b
applies to class b device only;
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 ± 5) %.
Test 2 Thermal shock
Following the preceding test, put the complete device in flow condition, supplying it with water at
90 °C. Once the temperature reaches 85 °C at the outlet of the device, hold the flow rate, in
accordance with table 3 (in this particular case this class b device shall satisfy the DN 6 require-
ments), for 60 min, and then supply with the same flow rate for 10 min with a water at 15 °C.
Test 3 a Mechanical endurance
In the situation described below (Figure 4).
A — Supply flow: maximum pressure of 0,3 MPa (3 bar) at zero flow.
B — Supply pressure: 1 ± 0,05 MPa (10 bar ± 0,5 bar)
C — Supply pressure: 0,3 ± 0,03 MPa (3 bar ± 0,3 bar)



Key
1, 2, 3, 4, 5 Isolating valve
6, 7 Adjusting valve
8 Pressure gauge
Figure 4 — Endurance testing equipment

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Table 3 — Nominal size versus endurance test flow rate
DN 6 8 10 15 20 25 32 40 50
3
Nominal flow rate (m/h) 0,14 0,25 0,4 1,4 2,2 3,8 6 9,5 14,7

Following the preceding tests 1 and 2, submit the device placed in the testing equipment (see Figure 4) to
5 000 cycles at a temperature of 65 °C, each cycle comprising:
 Stage 1: Open valves 5 then 1, circulation at a flow rate as given in Table 3 at the value ± 5 % for
(6 ± 2) s;
 Stage 2: Close valves 5 then 1;
 Stage 3: Open valve 3, static pressure at 0,3 MPa (3 bar) for (6 ± 2) s;
 Stage 4: Close valve 3, open valve 4 for (6 ± 2) s (Upstream drain): resulting in the opening of
the relief valve;
 Stage 5: Close valve 4;
 Stage 6: Open valves 5 then 1, circulation at a flow rate as given in Table 3 at the value ± 5 % for
(6 ± 2) s;
 Stage 7: Close valves 5 then 1;
 Stage 8: Open valve 2, static pressure at 1 MPa (10 bar) for (6 ± 2) s;
 Stage 9: Close valve 2, open valve 4 for (6 ± 2) s (Upstream drain): resulting in the opening of the relief
valve;
 Stage 10: Close valve 4.
The 5 000 cycles are broken down into seven periods as follows:
 1 250 cycles;
 the device is at rest for 14 h at the ambient temperature;
 1 250 cycles;
 the device is maintained under load at a static pressure of 1 MPa (10 bar) for 14 h at the ambient tem-
perature;
 1 250 cycles;
 the device is submitted for 14 h to an upstream pressure of 0,3 MPa (3 bar) and to a downstream pres-
sure of 1 MPa (10 bar) at the ambient temperature;
 1 250 cycles;
At the end of the three tests, verify that the device satisfies the requirements of 9.5.3.1.
9.5.4 Test 3b, reliability characteristics
The water used for the tests shall be not additionally treated potable water.
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The water hardness shall be noted.
Key
1 Isolating valve
2 Pressure gauge
3 Temperature gauge
L : 100 mm with rigid tube of a diameter related to the connection size
max
Figure 4 — Reliability testing equipment
 Install the device into the test bench as shown in Figure 5.
 Fill the device with water at a pressure of 0,3 MPa (3 bar).
 Isolate the device using valve 1.
 Subject it to a downstream pressure equal to 0,3 ± 0,05 MPa (3 ± 0,5 bar).
 Hold this pressure for three months with water at 65 °C.
Verify that the device satisfies the requirements of 9.5.3.1.
9.6 Tightness characteristics
9.6.1 Verification of the tightness of the downstream check valve (in the closing direction)
9.6.1.1 Requirement
Under the test conditions described below, no leakage nor permanent deformation or deterioration of the
downstream check valve shall occur.
9.6.1.2 Test methods
a) For class a device:
Downstream of the device, apply a pressure of 1,6 MPa (16 bar) with water at 20 °C, the upstream zone
being at atmospheric pressure. The pressure to be applied in increments 0,1 MPa (1 bar) per 5 s;
Hold the pressure for 2 min;
Isolate the device from the supply system for 10 min.
Verify that the device satisfies the requirement of 9.6.1.1 (note any pressure drop);
b) for class b device:
Downstream of the device, apply a pressure of 0,6 MPa (6 bar) with water at 20 °C, the upstream zone
being at atmospheric pressure. The pressure to be applied in increments 0,1 MPa (1 bar) per 5 s;
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Hold the pressure for 2 min;
Isolate the device from the supply system for 10 min.
Verify that the device satisfies the requirement of 9.6.1.1 (note any pressure drop)
9.6.2 Verification of the closing pressure of the downstream check valve and its tightness (opening
direction)
9.6.2.1 Requirement
The closing pressure of the downstream check valve shall be greater than 1 kPa (10 mbar). If a certified check
valve EB complying with EN 13959 is incorporated, the closing pressure shall be greater than 0,5 kPa
(5 mbar).
9.6.2.2 Test method
The verification is made by measuring the difference in height between two water levels (Figure 6). The inside
0
diameter of the level tubes shall be 10 mm .
− 2

Figure 6a      Figure 6b
Key
1,2,3,4 : isolating valve
C Transparent tube
Figure 5 — Closing pressure testing equipment
Remove the upstream check valve
...