SIST EN 15625:2021
(Main)Railway applications - Braking - Automatic variable load sensing devices
Railway applications - Braking - Automatic variable load sensing devices
This document applies variable load sensing devices designated to continuously sense the load of a railway vehicle and provide a signal that can be used by a relay valve for the automatic variation of the air pressure used for brake applications, thereby adjusting the brake force accordingly to achieve the required brake performance.
This document specifies the requirements for the design, dimensions, manufacture and testing of automatic variable load sensing devices.
Bahnanwendungen - Bremse - Automatisch kontinuierlich wirkende Lasterfassungseinrichtungen
Dieses Dokument gilt für automatisch kontinuierlich wirkende Lasterfassungseinrichtungen (Wiegeventile), die so beschaffen sind, dass sie die Last eines Eisenbahnfahrzeuges kontinuierlich erfassen und ein Signal erzeugen, das von einem Relaisventil für die automatische Anpassung des für eine Bremsbetätigung verwendeten pneumatischen Drucks benutzt wird, wodurch die Bremskraft zur Erzielung der geforderten Bremsleistung entsprechend angepasst werden kann.
In diesem Dokument werden die Anforderungen an die Konstruktion, die Abmessungen, die Herstellung und Prüfung von Wiegeventilen festgelegt.
Applications ferroviaires - Freinage - Dispositifs de pesée variable automatiques
Le présent document s’applique aux dispositifs de pesée destinés à détecter en continu la charge d’un véhicule ferroviaire et à fournir un signal utilisable par un relais pneumatique pour ajuster de façon automatique la pression d’air utilisée pour le freinage, ajustant ainsi l’effort de freinage en conséquence pour obtenir les performances de freinage requises.
Le présent document spécifie les exigences relatives à la conception, aux dimensions, à la fabrication et aux essais des dispositifs de pesée.
Železniške naprave - Zavore - Naprave za samodejno zaznavanje spremembe obtežbe
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 15625:2021
01-april-2021
Nadomešča:
SIST EN 15625:2009+A1:2011
Železniške naprave - Zavore - Naprave za samodejno zaznavanje spremembe
obtežbe
Railway applications - Braking - Automatic variable load sensing devices
Bahnanwendungen - Bremse - Automatisch kontinuierlich wirkende
Lasterfassungseinrichtungen
Applications ferroviaires - Freinage - Dispositifs de pesée variable automatiques
Ta slovenski standard je istoveten z: EN 15625:2021
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
SIST EN 15625:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 15625:2021
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SIST EN 15625:2021
EN 15625
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 45.040 Supersedes EN 15625:2008+A1:2010
English Version
Railway applications - Braking - Automatic variable load
sensing devices
Applications ferroviaires - Freinage - Dispositifs de Bahnanwendungen - Bremse - Automatisch
pesée variable automatiques kontinuierlich wirkende Lasterfassungseinrichtungen
This European Standard was approved by CEN on 20 December 2020.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15625:2021 E
worldwide for CEN national Members.
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SIST EN 15625:2021
EN 15625:2021 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 7
5 Design and manufacture . 7
5.1 General . 7
5.2 Functional requirements. 7
5.2.1 Operating requirements . 7
5.2.2 Characteristics of weighing valves . 7
5.2.3 Mechanical requirements . 8
5.2.4 Tightness . 8
5.3 Fire behaviour . 8
5.4 Shock and vibration . 9
5.5 Service life . 9
5.6 Compressed air quality . 9
5.7 Environmental conditions . 9
5.7.1 General . 9
5.7.2 Ambient temperature . 9
5.7.3 Altitude . 9
5.7.4 Humidity . 10
5.7.5 Rain . 10
5.7.6 Snow, ice and hail . 10
5.7.7 Solar radiation . 10
5.7.8 Pollution . 10
5.8 External appearance . 11
5.9 Design requirements regarding pressure stress . 11
5.10 Pneumatic connections . 11
6 Type tests . 11
6.1 General . 11
6.2 Individual automatic variable load sensing device type tests . 12
6.2.1 Test bench for individual automatic variable load sensing devices type tests . 12
6.2.2 Sampling for type test . 13
6.2.3 Test requirements . 13
6.2.4 Check of physical and geometrical characteristics . 14
6.2.5 Tightness . 14
6.2.6 Characteristic, hysteresis . 15
6.2.7 Operation at extreme temperature . 16
6.2.8 Shock and vibration tests . 18
7 In-service assessment. 19
8 Designation. 19
9 Identification and marking . 19
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Annex A (informative) Assessment of an automatic variable load sensing device when
fitted to a vehicle . 21
A.1 General . 21
A.2 Design acceptance testing set up . 21
A.3 Running tests . 21
A.3.1 General . 21
A.3.2 Pneumatic automatic variable load sensing device – Air consumption . 21
A.3.2.1 Procedure . 21
A.3.2.2 Pass/fail criteria . 21
A.3.3 Automatic variable load sensing device – Output signal variation . 22
A.3.3.1 Procedure . 22
A.3.3.2 Pass/fail criteria . 22
Annex B (normative) In-service assessment . 23
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2016/797/EU aimed to be covered. 24
Bibliography . 26
3
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SIST EN 15625:2021
EN 15625:2021 (E)
European foreword
This document (EN 15625:2021) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
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 August 2021, and conflicting national standards shall be
withdrawn at the latest by August 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15625:2008+A1:2010.
The main changes compared to EN 15625:2008+A1:2010 are:
a) normative references have been updated;
b) terms and definitions have been revised;
c) requirements on design and manufacture have been revised;
d) requirements on materials have been removed;
e) requirements on type tests have been revised;
f) requirements on routine test and inspection have been removed;
g) requirements on type validation have been removed;
h) requirements on in-service assessment have been added;
i) requirements on documentation have been removed;
j) requirements on designation, identification and marking have been revised;
k) Annex ZA has been updated.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive 2016/797/EU.
For relationship with EU Directive 2016/797/EU, see informative Annex ZA, which is an integral part of
this document.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
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SIST EN 15625:2021
EN 15625:2021 (E)
1 Scope
This document applies to automatic variable load sensing devices designed to continuously sense the
load of a railway vehicle and provide a pneumatic output signal that can be used by a relay valve for the
automatic variation of the air pressure used for brake applications, thereby adjusting the brake force
accordingly to achieve the required brake performance.
This document specifies the requirements for the design, testing and quality assurance of automatic
variable load sensing devices.
The requirements of this document are not fully applicable for tests on vehicle level (vehicle
homologation tests).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14478:2017, Railway applications — Braking — Generic vocabulary
EN 60721-3-5:1997, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 5: Ground vehicle installations
(IEC 60721-3-5:1997)
EN 61373:2010, Railway applications — Rolling stock equipment — Shock and vibration tests
(IEC 61373:2010)
EN 45545-2:2020, Railway applications — Fire protection on railway vehicles — Part 2: Requirements for
fire behavior of materials and components
EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads — Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
ISO 8573-1:2010, Compressed air — Part 1: Contaminants and purity classes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14478:2017 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia available at http://www.electropedia.org/
— ISO Online browsing platform available at https://www.iso.org/obp
3.1
automatic variable load sensing device
weighing valve
device connected to the vehicle, which responds to the loading of that vehicle to provide a continuous
load proportional signal to the brake control device
Note 1 to entry: The load input is normally a share of the wagon’s mass because of the devices position in the
vehicle suspension system. The result is a pneumatic output signal pressure that can be any value between a
5
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EN 15625:2021 (E)
minimum at tare mass and a maximum at maximum mass. Most of the existing self-adjusting load-dependant brakes
generate the load signal using a weighing valve.
3.2
mechanically operated pneumatic device
device or mechanism which responds to a mechanical input by a change of the output pressure
3.3
hydraulic to pneumatic converter
device or mechanism which transforms a hydraulic pressure into a pneumatic pressure with a defined
transmission ratio
3.4
elastomeric to pneumatic converter
device or mechanism having both elastomeric and pneumatic components, which transforms a pressure
in the elastomer into a pneumatic pressure with a defined transmission ratio
3.5
load control pressure
LCP
output pressure delivered by the automatic variable load sensing device, which signals the load of the
vehicle to the brake control device
3.6
supply pressure
input pressure from the air supply to the pneumatic variable load sensing device
Note 1 to entry: Typically supplied from the vehicle's auxiliary reservoir or from the output pressure/brake
cylinder pressure.
3.7
normal litre
Nl
unit of amount of a gas equal to the amount of 1 l at a pressure of 1,0 bar and at a standard temperature,
at 20 °C
Note 1 to entry: Air flow is often stated in normal litres per minute (Nl/min).
3.8
sensitivity
minimum change of load which causes a variation of the LCP, when the change of load (input) is in the
same direction
3.9
hysteresis
difference in LCP for the same load, which is first rising to a given value and then, having exceeded that
value, subsequently falls to the same value
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EN 15625:2021 (E)
4 Symbols and abbreviations
F mechanical force, generated by the share of vehicle mass acting at the automatic variable load
sensing device, expressed in kN
LCP load control pressure, expressed in bar
LCP_r measured value of LCP, expressed in bar
LCP_n nominal value of LCP, expressed in bar
5 Design and manufacture
5.1 General
The design and manufacture of the automatic variable load sensing device shall, for all intended operating
conditions, take into account the following requirements.
5.2 Functional requirements
5.2.1 Operating requirements
The automatic variable load sensing device shall, in all cases, supply a pneumatic LCP which is a function
of the load. The transmission of this load signal to the brake control system shall be pneumatic.
The method of producing the pneumatic signal LCP can be mechanically operated pneumatic device, a
hydraulic to pneumatic converter or an elastomeric to pneumatic converter.
Figure 1 indicates the principles of operation of an automatic variable load sensing device.
Key
1 automatic variable load sensing device
2 F, mechanical force, generated by a share of the vehicle mass
3 supply pressure, typically taken from the vehicle’s auxiliary reservoir
4 LCP
Figure 1 — Principles of operation of the automatic variable load sensing device
5.2.2 Characteristics of weighing valves
Three characteristics of weighing valves are defined:
— type 1: (0,8 ± 0,1) bar/10 kN;
— type 2: (0,88 ± 0,1) bar/10 kN;
— type 3: (1,0 ± 0,1) bar/10 kN.
These types are for new interoperable freight wagons.
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The characteristics of the types shall be tested in accordance with 6.2.6.
The example of characteristics with tolerances is shown in Figure 2.
Key
1 characteristic (nominal value)
2 upper limit of tolerance
3 lower limit of tolerance
Figure 2 — Characteristic of the automatic variable load sensing device
5.2.3 Mechanical requirements
The automatic variable load sensing device shall be designed for a static force F of at least 60 kN. The
maximum force shall not cause any damage or change of its characteristic. This shall be tested in
accordance with 6.2.6.1.
5.2.4 Tightness
Leakage of the automatic variable load sensing device shall be such that technical performance as
specified by this document is met without restrictions.
The sealing arrangement within the automatic variable load sensing device shall prevent any
unacceptable loss of air.
At an environmental temperature of (20 ± 5) °C, the automatic variable load sensing device shall not have
a leakage rate greater than 0,005 Nl/min when tested at a pressure of (7,0 ± 0,1) bar. This requirement
shall be tested in accordance with 6.2.5.
At an environmental temperature of –25 °C, also at +70 °C, the automatic variable load sensing device
shall not have a leakage rate greater than 0,01 Nl/min when tested at a pressure of (7,0 ± 0,1) bar. This
requirement shall be tested in accordance with 6.2.7.
At –40 °C ≤ environmental temperature < –25 °C an automatic variable load sensing device shall have a
leakage rate not greater than 0,1 Nl/min when tested at a pressure of (7,0 ± 0,1) bar in accordance with
6.2.7.
5.3 Fire behaviour
The fire behaviour of the automatic variable load sensing device shall correspond to the requirements of
EN 45545-2:2020.
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5.4 Shock and vibration
The design of the automatic variable load sensing device shall consider outside influences, e.g. impacts
and vibrations, and protect the device appropriately.
The automatic variable load sensing device shall be able to operate without restriction under shock and
vibration conditions as specified in EN 61373:2010. The class and category of test severity shall be
declared by design documentation.
These requirements shall be tested in accordance with 6.2.8.
5.5 Service life
No specific requirements for the automatic variable load sensing device to attain a particular service life
are contained in this document.
Any testing to estimate the service life of an automatic variable load sensing device should be conducted
as part of the product development.
NOTE The service life of the automatic variable load sensing device is a function of the environment/operating
conditions in which the automatic variable load sensing device will function, and the requirements for the automatic
variable load sensing device to achieve a serviceable life in accordance with the maintenance requirements of the
vehicle to which it is fitted.
5.6 Compressed air quality
It shall be possible to operate the automatic variable load sensing device without restrictions with at least
the compressed air quality in accordance with the following classes defined in ISO 8573-1:2010:
— class 3 – for the maximum particle size and the maximum concentration of solid contaminants;
— class 4 – for the water dew point;
— class 4 – for the maximum total (droplets, aerosols and vapours) oil concentration.
The automatic variable load sensing device shall be capable of operating in an air supply system that is
not fitted with an air dryer, or when the air dryer is out of order. The air system should therefore include
some means of preventing water collecting within the automatic variable load sensing device and hence
freezing of the water in conditions below 0 °C.
5.7 Environmental conditions
5.7.1 General
All the environmental requirements listed shall be taken into account within the design concept of the
components. However only the assessment tests listed in Clause 6 shall be performed. The remaining
proofs shall be presented in the declarations of conformity.
5.7.2 Ambient temperature
The automatic variable load sensing device covered by this document shall be able to operate from –40 °C
to +70 °C in accordance with the requirements of this document.
5.7.3 Altitude
The automatic variable load sensing device shall be able to operate without restrictions up to an altitude
of 2 000 m above sea level.
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5.7.4 Humidity
The following external humidity levels shall be considered:
— yearly average: ≤ 75 % relative humidity;
— on 30 days in the year continuously: between 75 % and 95 % relative humidity;
— on the other days occasionally: between 95 % and 100 % relative humidity;
3
— maximum absolute humidity: 30 g/m occurring in tunnels.
An operationally caused infrequent and slight moisture condensation shall not lead to any malfunction
or failure.
At cooled surfaces, 100 % relative humidity can occur, causing condensation on parts of equipment; this
shall not lead to any malfunction or failure.
Sudden lowering of the air temperature local to the vehicle may cause condensation of water on parts of
equipment with rate of 3 K/s and maximum fall in temperature of 40 K.
These conditions particularly occurring when entering or leaving a tunnel shall not lead to any
malfunction or failure of the equipment.
5.7.5 Rain
Rain rate of 6 mm/min shall be taken into account. The effect of rain shall be considered depending on
the possible equipment installation together with wind and vehicle movement.
5.7.6 Snow, ice and hail
Consideration shall be given to the effect of all kinds of snow, ice and/or hail. The maximum diameter of
hailstones shall be taken as 15 mm, exceptionally, larger diameters can occur.
The effect of snow, ice and hail shall be considered depending on the equipment installation together with
wind and vehicle movement.
5.7.7 Solar radiation
2
Equipment design shall allow for direct exposure to solar radiation at the rate of 1 120 W/m for a
maximum duration of 8 h.
5.7.8 Pollution
The effects of pollution shall be considered in the design of equipment and components. The severity of
pollution will depend upon the location of the equipment. Means may be provided to reduce the effect of
pollution. The effects of the following kinds of pollution shall be considered as given in Table 1.
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Table 1 — Pollution requirements
Pollution Class to be considered
Chemically active substances Class 5C2 of EN 60721-3-5:1997
Class 5F2 (electrical engine) of EN 60721-3-5:1997
Contaminating fluids
Class 5F3 (thermal engine) of EN 60721-3-5:1997
Biologically active substances Class 5B2 of EN 60721-3-5:1997
Dust Class 5S2 of EN 60721-3-5:1997
Stones and other objects Objects of maximum 15 mm diameter and ballast
Automatic variable load-sensing device
shall be designed so as to prevent intrusion
For the design of ventilation ducts
of grasses and leaves, pollen, flying insects,
fibres etc.
Sand Class 5S2 of EN 60721-3-5:1997
Sea spray Class 5C2 of EN 60721-3-5:1997
5.8 External appearance
The dimensions and the coordinates and threads of the ports and fixing points of the automatic variable
load sensing device shall comply with the details given by the relevant drawing.
The design of the automatic variable load sensing device shall ensure that the exterior surfaces of the
automatic variable load sensing device are free of sharp edges and corners that could be dangerous to
those people handling the automatic variable load sensing device or, when installed on a vehicle, working
on adjacent equipment.
This requirement shall be checked in accordance with 6.2.4.
5.9 Design requirements regarding pressure stress
The automatic variable load sensing device shall be able to withstand a supply pressure of (7,0 ± 0,1) bar
where applicable.
5.10 Pneumatic connections
The pipe connection threads of the automatic variable load sensing device for the supply pressure and
the LCP shall be G 1/4 in accordance with EN ISO 228-1:2003.
6 Type tests
6.1 General
The tests shall be performed by a competent laboratory.
NOTE As an example, a test institute in accordance with EN ISO/IEC 17025.
The following type tests shall be carried out in order to assess the performance of the automatic variable
load sensing device against the requirements of this document.
The type tests shall be conducted and the records shall be kept as evidence of the compliance with this
document.
The type tests shall be conducted on individual automatic variable load sensing devices.
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All the test requirements shall be achieved to obtain type test compliance.
Annex A contains tests that can be conducted as part of the type examination of a new automatic variable
load sensing device type.
6.2 Individual automatic variable load sensing device type tests
6.2.1 Test bench for individual automatic variable load sensing devices type tests
The type tests shall be performed on a test bench designed so that all the requirements given by this
document for the testing of the automatic variable load sensing device can be performed.
The dimensions and o
...
SLOVENSKI STANDARD
oSIST prEN 15625:2019
01-marec-2019
Železniške naprave - Zavore - Naprave za samodejno zaznavanje spremembe
obtežbe
Railway applications - Braking - Automatic variable load sensing devices
Bahnanwendungen - Bremse - Automatisch kontinuierlich wirkende
Lasterfassungseinrichtungen
Applications ferroviaires - Freinage - Dispositifs de pesée variable automatiques
Ta slovenski standard je istoveten z: prEN 15625
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
oSIST prEN 15625:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 15625:2019
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oSIST prEN 15625:2019
DRAFT
EUROPEAN STANDARD
prEN 15625
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2019
ICS 45.040 Will supersede EN 15625:2008+A1:2010
English Version
Railway applications - Braking - Automatic variable load
sensing devices
Applications ferroviaires - Freinage - Dispositifs de Bahnanwendungen - Bremse - Automatisch
pesée variable automatiques kontinuierlich wirkende Lasterfassungseinrichtungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15625:2019 E
worldwide for CEN national Members.
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oSIST prEN 15625:2019
prEN 15625:2019 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 6
5 Design and manufacture . 7
5.1 General . 7
5.2 Functional requirements. 7
5.2.1 Operating requirements . 7
5.2.2 Characteristics of weighing valves . 7
5.2.3 Mechanical requirements . 9
5.2.4 Leakage . 9
5.3 Vibrations and shock . 9
5.4 Environment . 9
5.4.1 General . 9
5.4.2 Temperature . 10
5.4.3 Other environmental conditions . 10
5.5 Compressed air quality . 11
5.6 Service life . 12
5.7 Fire behaviour . 12
5.8 External appearance . 12
5.9 Design requirements regarding pressure stress . 12
5.10 Interfaces . 12
5.10.1 Mechanical . 12
5.10.2 Pneumatic . 12
6 Materials . 12
7 Type tests . 13
7.1 General . 13
7.2 Individual automatic variable load sensing device type tests . 13
7.2.1 Test bench for individual automatic variable load sensing devices type tests . 13
7.2.2 Sampling for type test . 14
7.2.3 Test requirements . 14
7.2.4 Check of physical and geometrical characteristics . 15
7.2.5 Leakage . 15
7.2.6 Characteristic, hysteresis . 16
7.2.7 Operation at extreme temperature . 17
7.2.8 Vibration and shock tests . 19
8 Routine tests (serial tests) and inspection . 20
8.1 General . 20
8.2 Check of characteristic . 20
8.2.1 Procedure. 20
8.2.2 Pass/fail criteria . 20
9 Type validation . 21
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10 Documentation . 21
11 Designation . 21
12 Identification and marking . 21
Annex A (informative) Assessment of an automatic variable load sensing device when fitted
to a vehicle . 23
A.1 Vehicle assessment – Testing set up . 23
A.2 Design acceptance testing set up . 23
A.3 Running tests . 23
A.3.1 General . 23
A.3.2 Pneumatic automatic variable load sensing device – Air consumption . 23
A.3.3 Automatic variable load sensing device – Output signal variation . 24
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2008/57/EC aimed to be covered. 25
Bibliography . 28
3
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oSIST prEN 15625:2019
prEN 15625:2019 (E)
European foreword
This document (prEN 15625:2019) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15625:2008+A1:2010.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive 2008/57/EC.
For relationship with EU Directive 2008/57/EC, see informative Annex ZA, which is an integral part of
this document.
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oSIST prEN 15625:2019
prEN 15625:2019 (E)
1 Scope
This document applies variable load sensing devices designated to continuously sense the load of a
railway vehicle and provide a signal that can be used by a relay valve for the automatic variation of the
air pressure used for brake applications, thereby adjusting the brake force accordingly to achieve the
required brake performance.
This document specifies the requirements for the design, dimensions, manufacture and testing of
automatic variable load sensing devices.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14478, Railway applications — Braking — Generic vocabulary
EN 50125-1, Railway applications — Environmental conditions for equipment — Part 1: Rolling stock and
on-board equipment
EN 60721-3-5, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 5: Ground vehicle installations (IEC 60721-3-5)
EN 61373:2010, Railway applications — Rolling stock equipment — Shock and vibration tests
(IEC 61373:2010)
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)
ISO 8573-1, Compressed air — Part 1: Contaminants and purity classes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14478 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
automatic variable load sensing device
weight device
device connected to the vehicle, which response to the loading of that vehicle to provide a continuous
load proportional signal to the brake control device
Note 1 to entry: The load input is normally a share of the wagon’s mass because of the devices position in the
vehicle suspension system. The result is a pneumatic output signal pressure that can be any value between a
minimum at tare mass and a maximum at maximum mass. Most of the existing self-adjusting load-dependant brakes
generate the load signal using a weighing device.
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3.2
mechanically operated pneumatic device
device or mechanism having both mechanical and pneumatic elements
3.3
hydraulic to pneumatic converter
device or mechanism which transforms the hydraulic pressure generated by the mass of the vehicle into
a pneumatic pressure with a defined transmission ratio
3.4
elastomeric to pneumatic converter
device or mechanism having both elastomeric and pneumatic components, which transforms the
pressure in the elastomer generated by the mass of the vehicle into a pneumatic pressure with a defined
transmission ratio
3.5
output signal pressure
load continuous pressure
Lcp
output pressure delivered by the automatic variable load sensing device, which signals the load of the
vehicle to the brake control mechanism
3.6
supply pressure
input pressure of the air supply to pneumatic variable load sensing device
Note 1 to entry: Typically supplied from the vehicle's distributor auxiliary reservoir, or from the vehicle
distributor output pressure/brake cylinder pressure system.
3.7
normal litre
Nl
unit of mass for gases equal to the mass of 1 l at a pressure of 1,013 2 bar (1 atmosphere) and at a
standard temperature, often 0 °C or 20 °C
Note 1 to entry: Airflow is often stated in normal litres per minute (Nl/min).
3.8
sensitivity
minimum change of load which causes a variation of the output signal pressure (Lcp), when the change
of load (input) is in the same direction
3.9
hysteresis
difference in output signal pressure (Lcp) with the same load is first rising to a value and then, having
been taken past that value, subsequently falls to the same value
4 Symbols and abbreviations
F mechanical force, generated by the share of vehicle weight acting at the automatic variable load
sensing device, expressed in kN
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5 Design and manufacture
5.1 General
The design and manufacture of the automatic variable load sensing device shall, for all intended operating
conditions, take into account the following requirements.
5.2 Functional requirements
5.2.1 Operating requirements
The automatic variable load sensing device shall, in all cases, supply a pneumatic output signal pressure
(Lcp) which is a function of the load. The transmission of this load signal to the brake control system shall
be pneumatic.
The method of producing the pneumatic signal Lcp can be mechanically operated pneumatic device, a
hydraulic to pneumatic converter or an elastomeric to pneumatic converter.
Figure 1 indicates the principles of operation of an automatic variable load sensing device.
Key
1 automatic variable load sensing device
2 F, mechanical force, generated by a share of the vehicle weight
3 supply pressure, typically taken from the distributor auxiliary reservoir
4 Lcp, output signal pressure
Figure 1 — Principles of operation of the automatic variable load sensing device
5.2.2 Characteristics of weighing valves
Two characters of weighing valves are defined:
— type 1: (0,8 ± 0,1) bar/10 kN (see Figure 2);
— type 3: (1,0 ± 0,1) bar/10 kN (see Figure 3).
The characteristics for type 1 and type 3 shall be tested in accordance with 7.2.6.
These types are recommended for new interoperable freight wagons. For applications other than
interoperable freight wagons other characteristics may be used by agreement between the manufacturer
and the customer.
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Key
1 characteristic (nominal value)
2 upper limit of tolerance
3 lower limit of tolerance
Figure 2 — Characteristic of the automatic variable load sensing device type 1
Key
1 characteristic (nominal value)
2 upper limit of tolerance
3 lower limit of tolerance
Figure 3 — Characteristic of the automatic variable load sensing device type 3
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5.2.3 Mechanical requirements
The automatic variable load sensing device shall be designated to operate with at least a static force F at
60 kN without any damage or change of its characteristic. This shall be tested in accordance with 7.2.6.
5.2.4 Leakage
The sealing arrangement within the automatic variable load sensing device shall prevent any
unacceptable loss of air.
At of (20 ± 5) °C the automatic variable load sensing device shall not have a leakage rate greater than
0,005 Nl/min at the normal working pressure. This requirement shall be tested in accordance with
7.2.5.2, 7.2.5.3 and 7.2.5.4.
At an environmental temperature of –25 °C, also at +70 °C, the automatic variable load sensing device
shall not have a leakage rate greater than 0,01 Nl/min at the normal working pressure. This requirement
shall be tested in accordance with 7.2.7.2, 7.2.7.3 and 7.2.7.4.
At –40 °C ≤ environmental temperature < –25 °C the automatic variable load sensing device shall not
have a leakage rate greater than 0,1 Nl/min at the normal working pressure. This requirement shall be
tested in accordance with 7.2.7.2, 7.2.7.3 and 7.2.7.4.
5.3 Vibrations and shock
The automatic variable load sensing device shall be able to operate without restriction under vibration
and shock conditions as specified by EN 61373, Category 2. This requirement shall be tested in
accordance with 7.2.8.
The automatic variable load sensing device shall fulfil the specified requirements during a random
vibration test in accordance with EN 61373:2010, Clause 8.
The automatic variable load sensing device shall withstand a simulated long life test at increased random
vibration levels in accordance with EN 61373:2010, Clause 9, without any loss of performance.
The automatic variable load sensing device shall withstand shock testing in accordance with
EN 61373:2010, Clause 10, without any loss of performance.
The above shall be tested in accordance with 7.2.8.
5.4 Environment
5.4.1 General
The design shall be taken into account that the automatic variable load sensing device shall be able to be
put into service and operate normally in the conditions and climatic zones for which it is designed and in
which it is likely to run, as specified in this document.
NOTE 1 The environmental conditions are expressed in classes for temperature, etc. thereby giving the vehicle
designer to choice of an automatic variable load sensing device suitable for operation on a vehicle all over Europe,
or have a restricted use.
NOTE 2 The environmental range limits specified are those that have a low probability of being exceeded. All
specified values are maximum or limits values. These values may be reached, but do not occur permanently.
Depending on the situation there can be different frequencies of occurrence related to a certain period of time.
NOTE 3 The environmental requirements of this document cover the environment requirements of the TSI
relating to the subsystem ‘rolling stock — locomotives and passenger rolling stock’ which only refers to EN 50125-1.
The automatic variable load sensing device shall be tested in accordance with requirements given in
Clause 7 including where required environmental/climatic testing
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5.4.2 Temperature
The automatic variable load sensing device covered by this document shall be able to operate
— at –25 °C ≤ environmental temperature ≤ 70 °C without any deviation from the technical
requirements specified in Clause 5,
— at –40 °C ≤ environmental temperature < –25 °C with allowed deviation from the technical
requirements specified in this document but without affecting the function of the automatic variable
load sensing device.
Deviations from the technical requirement when testing at extremes are defined in 7.2.7.
The purchaser can be specify higher or lower extreme temperature limit values if operational constraints
demand it, In this case the temperature limit values used in the extreme temperature tests of 7.2.7 shall
be change accordingly.
5.4.3 Other environmental conditions
5.4.3.1 General
The following environmental conditions shall be considered in the design of the automatic variable load
sensing device.
It shall be demonstrated that these environmental conditions have been taken into account in the design
of the automatic variable load sensing device. It is sufficient for the supplier to make a declaration of
conformity stating how the environmental conditions in the following clauses have been taken into
account.
If not specifically required to be tested as part of the type testing requirements in Clause 7, suitable tests
and/or design assessments considering the effect of the following environmental conditions on the
automatic variable load sensing device, shall be used in the development/design proving of the automatic
variable load sensing device, prior to type testing.
5.4.3.2 Altitude
The automatic variable load sensing device shall be able to operate without restrictions up to an altitude
of 2 000 m.
5.4.3.3 Humidity
The following external humidity levels shall be considered:
— yearly average: ≤ 75 % relative humidity;
— on 30 days in the year continuously: between 75 % and 95 % relative humidity;
— on the other days occasionally: between 95 % and 100 % relative humidity;
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— maximum absolute humidity: 30 g/m occurring in tunnels.
An operationally caused infrequent and slight moisture condensation shall not lead to any malfunction
or failure.
The psychometric charts contained in EN 50125-1 shall be used to establish the range of variation of the
relative humidity for the different temperature classes that it is considered will not be exceeded for more
than 30 days per year.
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At cooled surfaces, 100 % relative humidity can occur, causing condensation on parts of equipment; this
shall not lead to any malfunction or failure.
Sudden changes of the air temperature local to the vehicle can cause condensation of water on parts of
equipment with rate of 3 K/s and maximum variation of 40 K; these conditions particularly occurring
when entering or leaving a tunnel shall not lead to any malfunction or failure of the equipment.
5.4.3.4 Rain
Rain rate of 6 mm/min shall be taken into account. The effect of rain shall be considered depending on
the possible equipment installation together with wind and vehicle movement.
5.4.3.5 Snow, ice and hail
Consideration shall be given to the effect of all kinds of snow, ice and/or hail. The maximum diameter of
hailstones shall be taken as 15 mm, larger diameter can occur exceptionally.
The effect of snow, ice and hail shall be considered depending on the equipment installation together with
wind and vehicle movement.
5.4.3.6 Solar radiation
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Equipment design shall allow for direct exposure to solar radiation at the rate of 1 120 W/m for a
maximum duration of 8 h.
5.4.3.7 Resistance to pollution
The effects of pollution shall be considered in the design of equipment and components. Means may be
provided to reduce pollution by the effective use of protection of the automatic variable load sensing
device. The severity of pollution can depend upon the location of the equipment therefore the effects of
the kinds of pollution indicated in Table 1 shall be considered as a minimum.
Table 1 — Pollution
Pollution Class to be considered
Chemically active substances Class 5C2 of EN 60721-3-5
Class 5F2 (electrical engine) of EN 60721-3-5
Contaminating fluids
Class 5F3 (thermal engine) of EN 60721-3-5
Biologically active substances Class 5B2 of EN 60721-3-5
Dust Class 5S2 of EN 60721-3-5
Stones and other objects Ballast and other objects of maximum 15 mm diameter
Sand Class 5S2 of EN 60721-3-5
Sea spray Class 5C2 of EN 60721-3-5
5.5 Compressed air quality
It shall be possible to operate the automatic variable load sensing device without restrictions with at least
the compressed air quality according to the following classes defined by ISO 8573-1:
— class 4 – for the maximum particle size and the maximum concentration of solid contaminants;
— class 4 – for the water dew point;
— class 4 – for the maximum total (droplets, aerosols and vapours) oil concentration.
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The automatic variable load sensing device shall be capable of operating in an air supply system that is
not fitted with an air dryer, or when the air dryer is out of order. The air system should therefore include
some means of preventing water collecting within the automatic variable load sensing device and hence
freezing of the water in conditions below 0 °C.
5.6 Service life
No specific requirements for the automatic variable load sensing device to attain a particular service life
are contained in this document.
Any testing to establish the service life of an automatic variable load sensing device shall be conducted as
part of the product development.
NOTE The service life of the automatic variable load sensing device is a function of the environment/operating
conditions in which the automatic variable load sensing device will function, and the requirements for the automatic
variable load sensing device to achieve a serviceable life in accordance with the maintenance requirements of the
vehicle to which it is fitted.
5.7 Fire behaviour
The materials used in the manufacture of the automatic variable load sensing device shall prevent the
emission of fumes or gases that are harmful and dangerous to the environment, particularly in the event
of fire.
The assembled automatic variable load sensing device shall limit fire ignition, propagation and the
production of smoke in the event of fire on primary ignition from a source of 7 kW for 3 min.
5.8 External appearance
The dimensions and the coordinates and threads of the ports and fixing points of the automatic variable
load sensing device shall comply with the details given by the relevant drawing.
The design of the automatic variable load sensing device shall ensure that the exterior surfaces of the
automatic variab
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