Bsi bs en 12259 2 1999 (2006)

BS EN
12259-2:1999

BRITISH STANDARD

Incorporating
Amendments Nos. 1, 2
and Corrigendum
No. 1

Fixed firefighting
systems — Components
for sprinkler and water
spray systems —
Part 2: Wet alarm valve assemblies
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The European Standard EN 12259-2:1999, with the incorporation of
Amendments A1:2001 and A2:2005, has the status of a British Standard

ICS 13.220.20

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BS EN 12259-2:1999

National foreword

—

aid enquirers to understand the text;

—

present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep
UK interests informed;
monitor related international and European developments and
promulgate them in the UK.

—

A list of organizations represented on this subcommittee can be obtained on
request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of British
Standards Online.
This publication does not purport to include all the necessary provisions of a

contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
This British Standard, having
been prepared under the
direction of the Health and
Environment Sector Policy and
Strategy Committee, was
published under the authority
of the Standards Policy and
Strategy Committee on
15 September 1999

Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 33 and a back cover.
The BSI copyright date displayed in this document indicates when the
document was last issued.
Sidelining in this document indicates the most recent changes by amendment.
Amendments issued since publication

© BSI 2006

Amd. No.

Date

Comments

12025

21 December 2001

Indicated by a sideline

13884
24 October 2002
Corrigendum No. 1

Revision of national foreword

16359

See national foreword

31 May 2006

ISBN 0 580 32943 7

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This British Standard is the official English language version of
EN 12259-2:1999, including amendments A1:2001 and A2:2005.

The start and finish of text introduced or altered by amendment is indicated in
the text by tags !". Tags indicating changes to CEN text carry the number
of the CEN amendment. For example, text altered by CEN amendment A1 is
indicated by !".
This European Standard is the subject to transitional arrangements agreed
under a Commission mandate which is intended to lead to CE marking in
support of the Construction Products Directive. In order to allow for any
changes in national regulations, the Member States have agreed a transition
period.
This period (date of applicability) started with an announcement in the Official
Journal of the European Communities(OJ) on 1 January 2002. The transition
period will end on 1 January 2003.
The UK participation in its preparation was entrusted by Technical Committee
FSH/18, Fixed firefighting systems, to Subcommittee FSH/18/2, Sprinklers,
which has the responsibility to:


EUROPEAN STANDARD

EN 12259-2

NORME EUROPÉENNE

June 1999

EUROPÄISCHE NORM

+ A1
February 2001

+ A2
November 2005
ICS 13.220.20
English version

Fixed firefighting systems — Components for sprinkler and water spray systems —
Part 2: Wet alarm valve assemblies
(includes amendments A1:2001 and A2:2005)
Installations fixes de lutte contre l’incendie —
Composants des systèmes d’extinction du type
sprinkler et à pulvérisation d’eau —
Partie 2: Systèmes de soupape d’alarme hydraulique
(inclut les amendements A1:2001 et A2:2005)

Ortsfeste Löschanlagen — Bauteile für Sprinkler- und
Sprühwasseranlagen —
Teil 2: Nalarmventil mit Zubehưr
(enthält Änderungen A1:2001 und A2:2005)

This European Standard was approved by CEN on 2 October 1997. Amendment A1:2001 was approved by CEN
on 20 January 2001 and amendment A2:2005 was approved by CEN on 19 October 2005.

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.

CEN

European Committee for Standardization
Comité Européen de Normalisation
Europäisches Komitee für Normung
Central Secretariat: rue de Stassart, 36 B-1050 Brussels
© 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
Members.
Ref. No. EN 12259-2:1999 + A1:2001 + A2:2005 E

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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.


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Page 2
EN 12259-2:1999
Contents
Page

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Foreword
1 Scope
2 Normative references
3 Definitions
4 Wet alarm valve assembly construction and performance
5 Retard chamber construction and performance
6 Marking
7 Instructions for fitting and operation
8 Evaluation of conformity
Annex A (normative) Fire exposure test for body and cover
Annex B (normative) Strength test for body and cover
Annex C (normative) Performance tests
Annex D (normative) Fatigue test for springs and diaphragms
Annex E (normative) Endurance tests
Annex F (normative) Resistance to ageing test for non-metallic components
(excluding gaskets and seals)
Annex G (normative) Resistance to adhesion test for sealing assembly elements
Annex H (normative) Determination of pressure loss due to hydraulic friction loss
Annex I (normative) Leakage resistance test
Annex J (normative) Strength test for retard chambers
Annex K (informative) Typical testing schedule and example of test specimen numbers
for wet alarm valve assemblies and retard chambers (only for conventional design)
Annex L (informative) Recommendations for type approval testing
Annex M (informative) Attestation of conformity
Annex N (normative) Salt mist corrosion test
Annex ZA (informative) Clauses of this European Standard addressing the
provisions of the EU Construction Products Directive
Bibliography

3
6
6
6
8
13
14
15
15
17
19
19
22
22
23
24
24
24
25
26
27
28
28
29
33

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Page 3
EN 12259-2:1999
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 191, Fixed firefighting systems,
the Secretariat of which is held by BSI.
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 1999, and conflicting national standards shall be withdrawn at the
latest by December 1999.
This European Standard has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.
It forms one part of EN 12259, covering components for automatic sprinkler systems and is included in a series
of European Standards planned to cover:
a)
b)
c)
d)
e)
f)
g)
h)

i)

automatic sprinkler systems (EN 12259);
gas extinguishing systems (EN 12094 and EN ISO 14520);
powder systems (prEN 12416);
explosion protection systems (EN 26184);
foam systems1);
halon systems1);
hydrant and hose reel systems (EN 671);
smoke and heat control systems (EN 12101);
water spray systems1).

Part 1: Sprinklers;
Part 2: Wet alarm valve assemblies;
Part 3: Dry alarm valve assemblies;
Part 4: Water motor alarms;
Part 5: Water flow detectors;
Part 6: Pipe couplings;
Part 7: Pipe hangers;
Part 8: Pressure switches;
Part 9: Deluge alarm valve assemblies;
Part 10: Multiple controls;
Part 11: Medium and high velocity water sprayers;
Part 12: Pump sets.
Users should note that standards undergo revision from time to time and that any reference made herein to any
other European or International Standard implies its latest edition, unless otherwise stated.
This standard is to be entrusted for use to qualified and experienced organizations.

1)

In preparation.

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EN 12259 has the general title Fixed firefighting systems — Components for sprinkler and water spray systems
and will be subdivided as follows:


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Page 4
EN 12259-2:1999

Foreword to amendment 1
This amendment EN 12259-2:1999/A1:2001 to the EN 12259-2:1999 has been prepared by Technical
Committee CEN/TC 191, Fixed fire fighting systems, the Secretariat of which is held by BSI.
This document is currently submitted to the Unique Acceptance Procedure.
This amendment to the European Standard EN 12259-2:1999 has been prepared under a mandate given to CEN
by the European Commission and the European Free Trade Association, and supports essential requirements of
EU Directive(s).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this standard.
It forms one part of EN 12259, covering components for automatic sprinkler systems and is included in a series

of European Standards planned to cover:
a)

automatic sprinkler systems (EN 12259 & EN 12845)1;

b) gaseous extinguishing systems (EN 12094)1;
c)

powder systems (EN 12416)1);

d) explosion protection systems (EN 26184);
e)

foam systems (EN 13565);

f)

hydrant and hose reel systems (EN 671);

g) smoke and heat control systems (EN 12101)1;
h) water spray systems1.
EN 12259 has the general title, Fixed fire fighting systems — Components for sprinkler and water spray
systems, and will subdivided as follows:
Part 1: Sprinklers;
Part 2: Wet alarm valve assemblies;
Part 3: Dry alarm valve assemblies;
Part 4: Water motor alarms;
Part 5: Water flow detectors;
Part 6: Pipe couplings;
Part 7: Pipe hangers;

Part 8: Pressure switches;
Part 9: Deluge alarm valve assemblies;
Part 10: Multiple controls;
Part 11: Medium and high velocity water sprayers;
Part 12: Sprinkler pump sets.

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Page 5
EN 12259-2:1999

Foreword to amendment 2
This European Standard (EN 12259-2:1999/A2:2005) has been prepared by Technical Committee
CEN/TC 191 “Fixed firefighting systems”, the secretariat of which is held by BSI.
This Amendment to the European Standard EN 12259-2:1999 shall be given the status of a national standard,
either by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national
standards shall be withdrawn at the latest by August 2007.
This European Standard has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this European
Standard.

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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,
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.

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Page 6
EN 12259-2:1999

1 Scope
This standard specifies requirements for constructions and performance of wet alarm valve assemblies and retard
chambers used in automatic sprinkler systems. Auxiliary components and attachments to wet alarm valve
assemblies and retard chambers are not covered by this standard.
NOTE All pressure data in this European standard are given as gauge pressure in bar.2)

2 Normative references

This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.

!Text deleted"
ISO 898-1:1988, Mechanical properties of fasteners — Part 1: Bolts, screws and studs.
ISO 898-2:1992, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values.

3 Definitions
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For the purposes of this standard, the following definitions apply.
3.1
alarm device
mechanical or electrical device to sound an alarm on operation of the wet alarm valve
3.2
clapper
type of sealing assembly (see 3.12)
3.3
compensator
external or internal device to minimize false alarms caused by small increase of service pressure
3.4
differential pressure ratio
ratio of service pressure to installation pressure at the trip point (see 3.18)
3.5
flow velocity
water velocity through a pipe of the same nominal size as the wet alarm valve at the same flow rate
3.6

installation pressure
static water pressure at the main outlet of the wet alarm valve when the valve is in the ready condition

2)

bar = 105 Pa.
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Page 7
EN 12259-2:1999
3.7
rated working pressure
maximum service pressure (see 3.15) at which the wet alarm valve or retard chamber is intended to operate
3.8
ready condition
state of the wet alarm valve in a sprinkler installation filled with water from a water supply of stable pressure,
when there is no water flow from any outlet downstream from the sealing assembly
3.9
reinforced elastomeric element
element of a clapper, clapper assembly or seat seals made of an elastomeric compound with one or more other
components that increase the tensile strength of the combination to at least twice that of the elastomeric material
alone

3.11
retard time
difference in times between the passage of water through the wet alarm valve port and the actuation of the alarm
device, measured with and without the retard chamber
3.12
sealing assembly
main movable sealing element of the wet alarm valve (such as a clapper)
3.13
sealing assembly seat ring
main fixed sealing element of the wet alarm valve
3.14
sensitivity
minimum rate of flow to open the wet alarm valve, and operate the alarm (see 4.11.2)
3.15
service pressure
static water pressure at the inlet to the wet alarm valve when the valve is in the ready condition
3.16
supplier
company responsible for design, manufacturing and quality assurance
3.17
trim
external equipment and pipework, excluding the main installation pipework, fitted to the wet alarm valve
assembly
3.18
trip point
point at which the wet alarm valve operates admitting water into the sprinkler installation measured in terms of
the installation and service pressures

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3.10
retard chamber
volumetric device to minimize false alarms caused by surges and fluctuations in water supplies


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Page 8
EN 12259-2:1999
3.19
waste of water
discharge of any water from the alarm port of the wet alarm valve which is in the ready condition
3.20
water motor alarm
hydraulically actuated alarm device (see 3.1) fitted to the wet alarm valve to provide a local audible alarm when
the sprinkler installation operates
3.21
wet alarm valve
valve to permit flow of water into a wet sprinkler installation but prevent reverse flow of water

4 Wet alarm valve assembly construction and performance

4.1 Nominal size
The nominal size shall be expressed as the nominal diameter of the inlet and outlet connections, i.e. the pipe size
for which the connections are intended. The nominal size shall be DN50, DN65, DN80, DN100, DN125,
DN150, DN200 or DN250.
NOTE The diameter of the waterway through the sealing assembly seat ring may be less than the nominal size.

4.2 Connections to the assembly
The dimensions of all connections shall be specified by the wet alarm valve assembly supplier.
4.3 Rated working pressure
The rated working pressure shall not be less than 12 bar.
NOTE Inlet and outlet connections may be machined for lower working pressure, to match installation equipment of a lower working
pressure.

4.4 Body and cover
4.4.1 Materials

!4.4.1.1 The body and any cover shall be made of cast iron, bronze, brass, monel metal, stainless steel,
titanium or other materials with equivalent physical and mechanical properties.
4.4.1.2 Cover fasteners shall be made of steel, stainless steel, titanium or other materials with equivalent
physical and mechanical properties.
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4.4.1.3 If non-metallic materials (other than for gaskets, pipe seals and unexposed plastic bushings and inserts),
or metals with a melting point of less than 800 °C (other than for gaskets, pipe seals and unexposed plastic
bushings and inserts), form part of the wet alarm valve body or cover, the sealing assembly shall open freely
and fully when tested in accordance with Annex A and the assembled wet alarm valve shall conform to the
requirements of 4.12."
4.4.2 Configuration
It shall not be possible to assemble the wet alarm valve cover plate (if fitted) in a position which so affects the
operation of the valve that it does not conform to this standard, in particular regarding the indication of flow

direction, [see 6.2 d)].

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Page 9
EN 12259-2:1999
4.4.3 Strength

!4.4.3.2 The normal design load of any fastener, excluding the force required to compress the gasket, shall
not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2 or other appropriate European
Standards for materials not covered by ISO 898, when the wet alarm valve is pressurised to four times the rated
working pressure. The area of the application of pressure shall be calculated as follows:
a) if a full-face gasket is used, the area of force application is that extending out to a line defined by the
inner edge of the bolts;
b) if a toroidal sealing ring or ring gasket is used, the area of force application is that extending out to the
centre line of the toroidal sealing ring or ring gasket.
4.5 Drain

The wet alarm valve shall be provided with a connection to drain water from the valve body downstream of
the sealing assembly when the valve is installed in any position specified or recommended by the supplier. The
minimum nominal size shall be 20 mm."
4.6 Sealing assembly
4.6.1 Access for maintenance

Means shall be provided for access to working parts and allow removal of the sealing assembly.
NOTE 1 Whatever method is adopted it should permit ready maintenance by one person with a minimum of down-time.
NOTE 2 The design of any element which may normally be disassembled during servicing should be such that it cannot be reassembled
wrongly without an external visual indication when the wet alarm valve is returned to service.
NOTE 3 With the exception of the valve seat, all parts intended for field replacement should be capable of being disassembled and
reassembled with tools normally employed by the trade.

4.6.2 Closing
The closing action of the wet alarm valve shall be assisted by gravity in all intended mounting positions, that is
the sealing assembly shall fall towards the seat when water flow ceases when tested in accordance with C.1.
NOTE Springs may be used to ensure full and proper seating.

4.6.3 Fatigue resistance of springs and diaphragms
Springs and diaphragms shall not fracture or rupture during 50 000 cycles of normal operation when tested in
accordance with annex D.
4.6.4 Resistance to damage of sealing assembly
The sealing assembly shall bear against a definite stop in the open position. There shall be no sign of damage to
the sealing elements of the wet alarm valve or any permanent twist, bend or fracture of any parts after testing in
accordance with E.1 and E.2.
4.6.5 Materials for seat rings and bearing surfaces

!4.6.5.1 Seat rings shall be made of bronze, brass, monel metal, stainless steel, titanium or materials having
at least equivalent physical, mechanical and corrosion resistant properties."

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4.4.3.1 The assembled wet alarm valve with the sealing assembly open shall withstand, without rupture, an
internal hydrostatic pressure of four times the rated working pressure, when tested in accordance with annex B.


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Page 10
EN 12259-2:1999
! 4.6.5.2 The bearing surfaces of any contacting parts, which rotate or slide relative to each other, shall be
made of bronze, brass, monel metal, stainless steel, titanium or non-metallic materials. This may be achieved by
bushings or inserts.
4.7 Non-metallic elements (excluding gaskets and seals)

After ageing in accordance with Annex F, there shall be no cracking of any non-metallic elements and a wet
alarm valve shall meet the performance and leak resistance requirements of 4.10.1 and 4.12 when tested in
accordance with C.1 and Annex J. Non-metallic bearing surfaces of any contacting parts which rotate or slide
relative to each other shall also meet the performance requirements of 4.13.2 when tested in accordance
with E.2."
4.8 Sealing assembly elements
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4.8.1 In the ready condition there shall be no waste of water when the wet alarm valve assembly is tested in
accordance with C.1.
NOTE Valve sealing surfaces should withstand ordinary wear and tear, rough usage, compression stresses, and damage due to pipe scale or
foreign matter carried by the water.

4.8.2 A seal made of elastomer or other resilient materials shall not adhere to the mating surface when tested in
accordance with annex G.
4.9 Clearances
NOTE 1 Clearances are necessary between moving parts and between moving and stationary parts so that corrosion or deposits of foreign
matter within an assembly will not render the wet alarm valve sluggish in action or inoperative.
NOTE 2 If an internal or external compensator is provided it should be such that deposits or sediment will not readily accumulate to an
extent sufficient to interfere with its proper operation, and there should be sufficient play between the working parts to allow proper seating
of the main and any auxiliary valves.

4.9.1 The radial clearance [see Figure 1a)] between the sealing assembly and the inside walls of the body, in
every position except the wide open position, shall not be less than 12 mm if the body is cast iron, or 6 mm if
body and sealing assembly are of non-ferrous metal, stainless steel, or a combination of those.
4.9.2 The diametrical clearance [see Figure 1b)], shall be not less than 3 mm between the inner edges of the seat
ring and the metal parts of a sealing assembly when in the closed position.
4.9.3 Any space in which the sealing assembly may trap debris below the valve seat shall be not less than 3 mm
deep.
4.9.4 The diametrical clearance [see Figure 1b)] between any pins and their bearings shall be not less than
0,125 mm.
4.9.5 The axial clearance (L2 - L1) [see Figure 1c)] between any clapper hinge and the adjacent wet alarm valve
body bearing surfaces shall be not less than 0,25 mm.
4.9.6 Any reciprocating guide components in the main valve body, operation of which is essential to allow a wet
alarm valve to open, shall have a minimum diametrical clearance of not less than 0,7 mm in that portion over
which the moving component enters the fixed component and of not less than 0,05 mm in that portion of the
moving component continuously in contact with the fixed component in the ready condition.

!4.9.7 Any sealing assembly bushings or hinge pin bearings shall project a sufficient axial distance to
maintain dimension A [see Figure 1 c)] at not less than 1,5 mm if the adjacent parts are not of bronze, brass,
monel metal, stainless steel, titanium or corrosion protected metal. Where corrosion protected metal parts are
used, the parts shall show no visible of deterioration of the coating such as blistering, delamination, flaking or
increased resistance to movement when tested in accordance with Annex N."

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Page 11
EN 12259-2:1999
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a) Radial clearance = R2 - R1

b) Diametrical clearance = D2 - D1

c) Total axial clearance = l2 - l1; clearance,
Dimension A =

l3 - l2
2

Key
1 valve body
2 pin
3 bushings
4 sealing assembly
Figure 1 — Clearances

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Page 12
EN 12259-2:1999
4.10 Performance
4.10.1 Alarm and sensitivity characteristics
When tested in accordance with C.1 before and after hydrostatic pressure testing in accordance with C.2 the wet
alarm valve assembly shall conform to the following.
a)

The valve shall not signal an alarm when discharge takes place downstream from the wet alarm valve, at
flows up to 10 l/min with a service pressure of 1,4 bar to rated working pressure.

NOTE It can signal an alarm when continuous discharge takes place downstream from the valve at flows above 10 l/min at all service
pressures.

b) The valve shall signal an alarm when continuous discharge takes place downstream from the wet alarm
valve at flows of 80 l/min to 300 l/min at service pressures from 1,4 bar to rated working pressure. Wet
alarm valves without retard chambers shall initiate continuous operation of mechanical and electrical
alarm devices within 15 s from the time that the downstream valve is opened. Wet alarm valves with

retard chambers shall initiate continuous operation of mechanical and electrical alarm devices between
5 s and 90 s after the wet alarm valve opens as indicated by water flow from the drain.
c) The valve shall stop water flow to alarm devices on cessation of water flow from the wet alarm valve
installation downstream of the wet alarm valve.
d) The valve shall transmit successive alarms without requiring manual resetting.
e) The valve shall provide a pressure of not less than 0,5 bar at pressure gauge 4 (see Figure C.1) corrected
to the level of the alarm port, or at the outlet of the retard chamber, if provided, at a service pressure of
1,4 bar, while actuating relevant water motor alarms and electric alarm devices.
f) The piping between the wet alarm valve or any alarm shut-off valve and the water motor alarm shall
drain automatically after each operation.
4.10.2 Resistance to reverse flow and deformation
The wet alarm valve assembly shall withstand, without leakage, permanent distortion or structural failure, an
internal hydrostatic pressure of twice the rated working pressure applied at the downstream end with the sealing
assembly closed and the upstream end vented, when tested in accordance with C.2.
4.10.3 Operation
The wet alarm valve shall operate correctly, without adjustment or damage, at service pressures within the range
from 1,4 bar to the rated working pressure, when tested in accordance with C.1. The wet alarm valve shall reset
automatically after each operation.
4.10.4 Differential pressure ratio
The ratio of service pressure to installation pressure shall not exceed 1,16:1 for service pressures from 1,4 bar to
the rated working pressure as measured at the trip point prior to pressure equalization upstream and downstream
of the sealing assembly when tested in accordance with C.3.
4.11 Pressure loss due to hydraulic friction
The pressure loss across the wet alarm valve shall not be more than 0,4 bar when tested in accordance with
annex H.
NOTE If the pressure loss is more than 0,2 bar the wet alarm valve is marked with the pressure loss [see 6.2i)], because there are
restrictions in the application of such valves.

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Page 13
EN 12259-2:1999
4.12 Leak resistance
There shall be no leakage, permanent distortion or rupture of a wet alarm valve at an internal hydrostatic
pressure of twice the rated working pressure applied to the upstream and the downstream end with the sealing
assembly closed and the alarm port opened when tested in accordance with annex J.
4.13 Endurance
4.13.1 The wet alarm valve and its moving parts shall show no sign of distortion, cracks, delamination,
loosening, displacement, or other failure when tested in accordance with E.1.
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4.13.2 The wet alarm valve and its moving parts shall show no sign of distortion, cracks, delamination,
loosening, displacement, or other failure when tested through 1 000 operation cycles in accordance with E.2.

5 Retard chamber construction and performance
5.1 Rated working pressure
The rated working pressure shall not be less than 12 bar.
5.2 Strength
The retard chamber shall withstand an internal hydrostatic pressure of not less than twice the rated working
pressure without failure or leakage when tested in accordance with annex K.

5.3 Strainer
A strainer shall be fitted where water passages in the retard chamber are 6 mm or less in diameter. The maximum
dimension of the openings in the strainer shall not be more than two-thirds of the diameter of the smallest water
passage to be protected by the strainer. The total cross-sectional area of the openings in the strainer shall be not
less than twenty times the cross-sectional area of the water passages.
NOTE The strainer should be of a corrosion resistant material.

5.4 Support
The retard chamber shall include means for its support. If piping is to be used for this support, the pipe size to be
used and the maximum length of pipe so used shall be stated on the instruction charts provided with the retard
chamber.
5.5 Connections

!A connection of a nominal size not less than 20 mm shall be provided in the retard chamber for the
connection of alarm devices."
NOTE Any control valve fitted between an alarm valve and a retard chamber should be of a type that can be locked or sealed in an open
position. It should be visibly apparent whether the control valve is open or closed.

5.6 Drain
The retard chamber shall be provided with means for automatic draining. The time for the retard chamber,
including associated trim specified by the manufacturer, completely filled with water to drain to atmosphere shall
not exceed 5 min.

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Page 14
EN 12259-2:1999
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5.7 Access for maintenance
Means shall be provided for access to working parts.
NOTE 1 Whatever method is adopted it should permit ready maintenance by one person with a minimum of down-time.
NOTE 2 The design of any element which may normally be disassembled during servicing should be such that it cannot be reassembled
wrongly.
NOTE 3 All parts intended for field replacement should be capable of being disassembled and reassembled with tools normally employed
by the trade.

5.8 Elements
5.8.1 Springs and diaphragms
Springs and diaphragms shall not fracture or rupture during 50 000 cycles of normal operation when tested in
accordance with annex D.
5.8.2 Non-metallic elements (excluding gaskets and seals)
After ageing in accordance with annex F, there shall be no cracking of any non-metallic components and the
retard chamber shall meet the requirements of 4.10.1 when tested in accordance with C.1 and shall meet the
strength requirements of 5.2 when tested in accordance with annex K.

6 Marking
6.1 General

!The markings specified in 6.2 and 6.3 shall be as follows:
a) either cast or stamped directly on the wet alarm valve or retard chamber; or

b) on a metal label with raised or depressed characters (for example by etching, casting, or stamping), that is
mechanically attached (for example by rivets or screws) to the body of the wet alarm valve or retard
chamber; cast labels shall be of non-ferrous metal.
The minimum dimensions of the marked characters shall be as specified in Table 1.
Table 1 — Minimum dimensions of marked characters
Minimum character height,
except for 6.2 g)a
mm

Minimum depression or
projection of characters
mm

Cast directly on a wet alarm valve

9,5

0,75

Cast directly on a retard chamber

4,7

0,75

Cast label

4,7

0,5

Non-cast label

2,4

Not applicable

Printed label

2,4

Not applicable

Stamped directly on wet alarm valve

4,7

0,1

Type of marking

a

The minimum character height for item g), serial number or year of manufacture, shall be 3 mm.

"
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Page 15
EN 12259-2:1999
6.2 Wet alarm valves
Wet alarm valves shall be marked with the following:
a)
b)
c)
d)
e)
f)
g)

h)
i)
j)
k)

name or trade mark of the supplier;
distinctive model number, catalogue designation or equivalent marking;
name of device, i.e. “wet alarm valve”;
indication of flow direction;
nominal size of valve;
rated working pressure in bar;
serial number, or a year which shall be one of the following:

1) the actual year of manufacture; or
2) for wet alarm valves manufactured in the last three months of a calendar year, the following year
date; or
3) for wet alarm valves manufactured in the first six months of a calendar year, the previous year date;
mounting position if limited to vertical or horizontal position;
pressure loss due to hydraulic friction if more than 0,2 bar (see 4.11);
factory of origin, if manufacture is at two or more factories;
the number of this European Standard i.e. EN 12259-2 .

6.3 Retard chambers
Retard chambers shall be marked with the following:
a)
b)
c)
d)
e)
f)
g)

name or trademark of the supplier;
distinctive model number, catalogue designation or equivalent marking;
name of device, i.e. “retard chamber”;
rated working pressure in bar;
indication of flow direction;
factory of origin, if manufacture is at two or more factories;
the number of this European Standard i.e. EN 12259-2.

7 Instructions for fitting and operation
Instructions for fitting and operation shall be supplied with each wet alarm valve and each retard chamber. These
shall include an illustration showing the recommended method of fitting and the trim function, assembly views

and to explain operation, and recommendations for care and maintenance.

8 Evaluation of conformity
8.1 General
The compliance of a wet alarm valve assembly with the requirements of this standard shall be demonstrated by:
— initial type testing;
— factory production control by the manufacturer.
8.2 Initial type testing
Initial type testing shall be performed on first application of this standard. Tests previously performed in
accordance with the provisions of this standard (same product, same characteristic, test method, sampling
method and system of attestation of conformity) may be taken into account. In addition, initial type testing shall
be performed at the beginning of the production type or at the beginning of a new method of production (where
there may affect the stated properties).
All characteristics given in clause 4 and where appropriate clause 5, shall be subject to initial type testing.

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Page 16
EN 12259-2:1999

8.3 Factory production control (FPC)
The supplier shall establish, document and maintain an FPC system to ensure that the products placed on the
market conform with the stated performance characteristics.
The FPC system shall consist of procedures, regular inspections and test and/or assessments and the use of the
results to control raw and other incoming materials or components, equipment, the production process and the
product. It shall be sufficiently detailed to ensure that the conformity of the product is apparent, ensuring
detection of irregularities at the earliest possible stage.
An FPC system conforming with requirements of the relevant parts(s) of EN ISO 9000, and made specific to the
requirements of this standard, shall be considered to satisfy the above requirements.

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The results of inspections, tests or assessments requiring action shall be recorded, as shall any action taken. The
action to be taken when control values or criteria are not met shall be recorded.
The production control procedure shall be recorded in a manual, which shall be made available when requested.
The supplier shall carry out and record the results of production tests as part of the production control.
These records shall be available if requested.

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Page 17
EN 12259-2:1999
Annex A (normative)

Fire exposure test for body and cover
NOTE See 4.4.1.2.

Mount the wet alarm valve, without trim and with body openings sealed, horizontally as shown in Figure A.1.
Fill the pipework and valve between valves A and B with water. Close valve A and open valve B.
Position a fire tray, having a surface area not less than 1 m2, centrally beneath the wet alarm valve. Place a
sufficient volume of a suitable fuel in the tray to give an average air temperature between, 800 °C and 900 °C
around the valve for a period of (15 ± 1) min after a temperature of 800 °C is reached.
Measure the temperature with two thermocouples positioned diametrically opposite and at a distance of 10 mm
to 15 mm from the surface of the wet alarm valve on a horizontal plane parallel to the axis at the mid-point
between the mounting connections.
Ignite the fuel and after (15 ± 1) min exposure at 800 °C to 900 °C remove the fire tray or extinguish the fire.
Starting within 1 min of extinction, cool the wet alarm valve by flushing with (100 ± 5) 1/min of water for a
period of at least 1 min. Dismantle the valve to expose the sealing assembly and manually check whether or not
the sealing assembly opens freely and fully.
Hydrostatically test the wet alarm valve by the method described in annex J. External body gaskets and seals
may be replaced for this hydrostatic test.

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Page 18
EN 12259-2:1999
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C
A

B

D

A shut-off valve
B shut-off valve
C test valve
D fire tray

Figure A.1 — Test installation for fire exposure test

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Page 19
EN 12259-2:1999

Annex B (normative)
Strength test for body and cover
NOTE 1 See 4.4.3.1.
NOTE 2 For the purpose of this test standard production bolts, gaskets and seals may be replaced by components capable of withstanding
the pressure to be used.

Arrange connections for hydraulically pressurizing the wet alarm valve body at the inlet connection and a means of
venting air and pressurizing fluid at the outlet connection. Blank off or plug all other openings. With the sealing
assembly held open, pressurize the body to not less than 4 times and not more than 4,1 times the rated working
pressure for a period of (5 ± 1) min. Examine the wet alarm valve for rupture.

Annex C (normative)
Performance tests
NOTE See 4.6.2, 4.7, 4.8.1 and 4.10.

C.1 Alarm and sensitivity characteristics
Carry out each test using each recommended position (e.g. vertical, etc). Install the wet alarm valve and its
associated trim, fitted in accordance with the supplied instructions (see clause 7), in the test rig generally as shown
in Figure C.1, using piping of the same nominal diameter as the nominal size of the wet alarm valve. Ensure that the
water motor alarm inlet is not more than (0,5 ± 0,1) m above the alarm outlet of the valve.
Fully drain the trim piping before each test and check the drain for any signs of waste of water immediately before
each test run and record any leakage.
Adjust the test rig control valves to produce a flow rate of 10 0 l/min at a service pressure of 1,4 +00,2 bar. Check
-2

that the alarm is not operating.
Do not manually reset the valve during the following six tests, one at each of the six combinations as follows:
a)

1,4 +00,2 bar and (80 ± 4) l/min;

b) 1,4 +00,2 bar and (300 ± 15) l/min;
c) (7 ± 0,5) bar and (80 ± 4) l/min;
d) (7 ± 0,5) bar and (300 ± 15) l/min;
e) rated working pressure ±0,5 bar and (80 ± 4) l/min;
f) rated working pressure ±0,5 bar and (300 ± 15) l/min.
Open valve R completely. Adjust the control valves S and T to give the appropriate flow rate and pressure. Close
valve R.
Allow the trim piping to drain and record any leakage.
Open valve R and time the period between the first appearance of water from the drain and continuous operation of
the mechanical and electrical alarm devices. Record the pressure at gauge 4 when the alarm begins. Close valve R
and check that the water flow to the audible alarm devices ceases.
Check for complete drainage of the alarm line after each run and check the drainage time of the retard chamber if
provided.
Check that the sealing assembly falls towards the seat when water flow ceases.
Test the wet alarm valve in accordance with C.2 and then repeat the above tests.

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Page 20
EN 12259-2:1999
C.2 Resistance to reverse flow and deformation
Fit the wet alarm valve with its associated trim, including any external compensator, in accordance with the supplied
instructions (see clause 7). Blank off the downstream outlet connection. Fit a connector and bleed valve to enable
the downstream portion of the wet alarm valve to be hydrostatically pressurised. Plug all other connections on the
portion of the wet alarm valve downstream of the sealing assembly. Apply an internal hydrostatic pressure of not
less than twice and not more than 2,1 times the rated working pressure downstream of the closed sealing assembly
for a period of (5 ± 1) min. Examine the wet alarm valve assembly for leakage. Release the pressure from the wet
alarm valve and examine for permanent distortion or structural failure.
C.3 Differential pressure ratio
Install the wet alarm valve in a test rig generally as shown in Figure C.1, using piping of the same nominal diameter
as the nominal size of the wet alarm valve. Use a differential pressure measuring device with an error limit of ±2 %
at 1 bar. Apply a service pressure of 1,4 +00,2 bar. Release a small flow of water from the downstream side of the wet
alarm valve, increase this flow to the trip point and record the maximum achieved differential pressure with an error
limit of ±2 % at the trip point. This is indicated by the maximum value of differential pressure obtained just before
the valve opens. Record the flow rate at the trip point. Calculate the differential pressure ratio as follows:
differential pressure ratio =

service pressure
service pressure - maximum differential pressure

Repeat the test at service pressures of (7 ± 0,5) bar and the rated working pressure ±0,5 bar and record the results.

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Page 21
EN 12259-2:1999

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1 Alarm valve
4 Pressure gauge for monitoring alarm line
pressure
7 Flow measuring device (error limit of ± 5%)
S Control valve

2 Alarm port
5 Water motor alarm

3 Retard chamber (if fitted)
6 Differential pressure measuring device

8 Typical trim, vary in accordance with
supplier's instruction.
T Control valve

R Control valve (quick opening type)

Figure C.1 — Operational, hydraulic friction loss and endurance test installation

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Page 22
EN 12259-2:1999
Annex D (normative)
Fatigue test for springs and diaphragms
NOTE See 4.6.3 and 5.8.1.

Subject the spring or diaphragm to (50 000 ± 100) cycles of normal operation. Operate the device at a rate not
exceeding 6 cycles per minute. For sealing assembly hinge springs, rotate the sealing assembly off the seat to at
least a 45° angle and slowly return to the closed position. For internal bypass springs, operate the bypass from
the fully open position to the closed position. Flex retard chamber diaphragms from the normally open to the
normally closed position. Record any fracture or rupture.

Annex E (normative)
Endurance tests
NOTE See 4.13.

E.1 Flow test
NOTE The test of annex H may be carried out concurrently.

Install the wet alarm valve in a test rig generally as shown in Figure C.1, using piping of the same nominal
diameter as the nominal size of the wet alarm valve. Induce a flow through the wet alarm valve at a rate as
specified in Table E.1 and maintain for (30 ± 1) min. Examine the wet alarm valve, in particular its sealing
elements, for signs of distortion, cracks, delamination, loosening, displacement or other failure.
Table E.1 — Flow rates for flow test and determination
of pressure loss due to hydraulic friction

50
65
80
100
125
150
200
250

Flow rate
l/min

600
800
1 300
2 200
3 500
5 000
8 700
14 000

E.2 Cyclic test

Install the wet alarm valve in a test rig generally as shown in Figure C.1, using piping of the same nominal
diameter as the nominal size of the wet alarm valve. Cycle a flow (1 000 ± 5) times from 0 l/min to 200 l/min
for each of the three service pressures of 1,4 +00,2 bar, (7 ± 0,5) bar and the nominal working pressure ±0,5 bar.
Examine the wet alarm valve for signs of distortion, cracks, delamination, loosening, displacement or other
failure.

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Nominal size
mm


Page 23
EN 12259-2:1999
Annex F (normative)
Resistance to ageing test for non-metallic components (excluding gaskets and seals)
NOTE See 4.7 and 5.8.2.

F.1 Warm air ageing

If the material cannot withstand the temperature indicated without excessive softening, distortion, or
deterioration, carry out an air oven ageing test at a lower temperature, but not less than 70 °C, for a longer period

of time. Calculate the duration of exposure, D, (in days), from the following:
D = 737 000 e-0,0693t
where
t is the test temperature, in degrees Celsius.
NOTE This equation is based on the 10 °C rule i.e. for every 10 °C rise in temperature, the rate of a chemical reaction is approximately
doubled. When applied to plastics ageing it is assumed that the life at a temperature, t in °C, is half the life at (t - 10) °C.

F.2 Warm water ageing
Immerse a sample of each of the elements in tap water at (87 ± 2) °C for (180 ± 1) days. Remove the samples
from the water and allow to cool in air at (23 ± 2) °C and relative humidity (70 ± 20) % for not less than 24 h
before carrying out any test, measurement or examination.
If the material cannot withstand the temperature indicated without excessive softening, distortion or
deterioration, carry out the water ageing test at a lower temperature, but not less than 70 °C, for a longer period
of time. Calculate the duration of exposure, D, (in days) from the following:
D = 74 857 e-0,0693t
where
t is the test temperature, in degrees Celsius.
NOTE This equation is based on the 10 °C rule, i.e. for every 10 °C rise in temperature, the rate of a chemical reaction is approximately
doubled. When applied to plastics ageing it is assumed that the life at a temperature, t in °C, is half the life at (t - 10) °C.

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Age a sample of each non-metallic element in an air oven at (120 ± 2) °C for (180 ± 1) days. Support the
elements so that they do not touch each other or the sides of the oven. Remove the samples from the oven and
allow to cool in air at (23 ± 2) °C and relative humidity (70 ± 20) % for not less than 24 h before carrying out
any test, measurement or examination.