SIST EN 15625:2021

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


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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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

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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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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;
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.
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
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.
5.4.3.7 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
...