SIST EN 15611:2009
Railway applications - Braking - Relay valves
Railway applications - Braking - Relay valves
This European Standard is applicable to relay valves designed to control the brake cylinder pressure of compressed air brakes fitted to railway vehicles, in association with an air brake distributor valve or other control device, and in response to a change in vehicle load that is either continuously variable or in two stages i.e. empty - loaded. Relay valves operating with other pressures, in particular the brake pipe pressure, are not included. This European Standard specifies the requiremernts for the design, testing and manufacture of relay valves.
Bahnanwendungen - Bremse - Relaisventile
Diese Europäische Norm gilt für Relaisventile zur Steuerung des Bremszylinderdruckes von Druckluftbremsen in Eisenbahnfahrzeugen in Zusammenarbeit mit einem Bremssteuerventil oder einem anderen Steuerelement, abhängig von einer Veränderung der Fahrzeugbeladung, die entweder autokontinuierlich oder zweistufig, d.h. leer beladen, erfolgt.
Relaisventile, die mit anderen Betriebsdrücken, insbesondere dem Bremsleitungsdruck, arbeiten, sind hierin nicht erfasst.
In dieser Europäischen Norm werden die Anforderungen für die Konstruktion, die Prüfung und die Herstellung von Relaisventilen festgelegt.
Applications ferroviaires - Freinage - Relais pneumatiques
La présente Norme européenne s’applique aux relais pneumatiques conçus pour commander la pression du
cylindre des freins à air comprimé montés sur les véhicules ferroviaires, en association avec un distributeur de
freinage à air ou un autre dispositif de commande et en fonction des variations de la charge du véhicule. La
pression commandée peut varier soit continuellement en fonction des variations de la charge, soit par paliers
à 2 niveaux (un niveau pour l’état de charge « vide » et un autre pour l’état de charge « chargé »).
Les relais pneumatiques fonctionnant avec d’autres pressions, notamment la pression de conduite générale,
ne sont pas considérés dans cette norme.
La présente Norme européenne spécifie les exigences relatives à la conception, à la fabrication et aux essais
des relais pneumatiques.
Železniške naprave - Zavore - Ventili za kontrolo tlaka
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Železniške naprave - Zavore - Ventili za kontrolo tlakaBahnanwendungen - Bremse - RelaisventileRailway applications - Braking - Relay valves45.040Materiali in deli za železniško tehnikoMaterials and components for railway engineeringICS:Ta slovenski standard je istoveten z:EN 15611:2008SIST EN 15611:2009en,fr01-januar-2009SIST EN 15611:2009SLOVENSKI
STANDARD
SIST EN 15611:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15611November 2008ICS 45.060.01 English VersionRailway applications - Braking - Relay valvesApplications ferroviaires - Freinage - Relais pneumatiquesBahnanwendungen - Bremse - RelaisventileThis European Standard was approved by CEN on 27 September 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15611:2008: ESIST EN 15611:2009
EN 15611:2008 (E) 2 Contents Page Foreword.4 1 Scope.5 2 Normative references.5 3 Terms and definitions, symbols and abbreviations.5 3.1 Terms and definitions.5 3.2 Symbols.9 3.3 Abbreviations.10 4 Design and manufacture.10 4.1 General.10 4.2 Functional requirements.12 4.2.1 Minimum output pressure.12 4.2.2 Accuracy of the output pressure and changeover.13 4.2.3 Load signal characteristics.13 4.2.4 Enabling of a change of relay valve ratio during brake application of a relay valve of type B1.14 4.2.5 Prevention of a change of relay valve ratio during brake application of a relay valve of type B2 and a variable load relay valve, types C, C1, D, E.14 4.2.6 Kinked characteristic of a variable load relay valve (type E).14 4.2.7 Interaction of a relay valve and a distributor valve.15 4.2.8 Hysteresis.16 4.2.9 Sensitivity.16 4.2.10 Flow.16 4.2.11 Leakage.16 4.2.12 Change of relay valve ratio.16 4.3 Shock and vibration.17 4.4 Environment requirements.17 4.4.1 General.17 4.4.2 Temperature.17 4.4.3 Other environmental conditions.18 4.5 Compressed air quality.19 4.6 Service life.20 4.7 Fire behaviour.20 4.8 External appearance.20 4.9 Design requirements regarding pressure stress.20 4.10 Interface.20 4.10.1 General.20 4.10.2 Mechanical.20 4.10.3 Pneumatic.20 5 Materials.21 6 Type tests.21 6.1 General.21 6.2 Individual relay valve tests.21 6.2.1 Test bench for individual relay valves.21 6.2.2 Sampling for type tests.24 6.2.3 Test temperature and air quality.24 6.2.4 Procedure for type tests.24 7 Routine test and inspection.47 8 Type-validation.47 SIST EN 15611:2009
EN 15611:2008 (E) 3 9 Documentation.47 10 Designation.48 11 Identification and marking.48 Annex A (informative)
In-service trial.49 A.1 General.49 A.2 Test set-up and sampling.49 A.3 Procedure.49 A.4 Pass/fail criteria.49 Annex B (informative)
Static vehicle and running tests.50 B.1 General.50 B.2 Test recommendations.50 B.2.1 Variable load relay valve.50 B.2.2 Empty/load relay valve.51 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 96/48/EC as modified by Directive 2004/50/EC.52 Annex ZB (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2001/16/EC of the European Parliament and of the Council of 19 March 2001 on the interoperability of the trans-European conventional rail system, as modified by EU Directive 2004/50/EC of 29 April 2004.53 Bibliography.54
SIST EN 15611:2009
EN 15611:2008 (E) 4 Foreword This document (EN 15611:2008) 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 May 2009, and conflicting national standards shall be withdrawn at the latest by May 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This European Standard has been prepared under a mandate given to CEN/CENELEC/ETSI by the European Commission and the European Free Trade Association and supports essential requirements of EU Directive 96/48 and EU Directive 2001/16, as modified by EU Directive 2004/50. For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 15611:2009
EN 15611:2008 (E) 5 1 Scope This European Standard is applicable to relay valves designed to control the brake cylinder pressure of compressed air brakes fitted to railway vehicles, in association with an air brake distributor valve or other control device, and in response to a change in vehicle load that is either continuously variable or in two stages i.e. empty - loaded. Relay valves operating with other pressures, in particular the brake pipe pressure, are not included. This European Standard specifies the requirements for the design, manufacture and testing of relay valves. 2 Normative references The following referenced documents are indispensable for the application 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 14478:2005, Railway applications – Braking – Generic vocabulary EN 15355, Railway applications – Braking - Distributor valves and distributor-isolating devices EN 15625, Railway applications – Braking – Automatic variable load sensing devices EN 50125-1, Railway applications – Environmental conditions for equipment – Part 1: Equipment on board rolling stock 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 61373:1999, Railway applications – Rolling stock equipment – Shock and vibration tests (IEC 61373:1999) EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads – Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) ISO 8573-1:2001, Compressed air – Part 1: Contaminants and purity classes 3 Terms and definitions, symbols and abbreviations For the purposes of this document, the terms and definitions, symbols and abbreviations given in EN 14478:2005 and the following apply. 3.1 Terms and definitions 3.1.1 relay valve device, the main function of which is to control a pneumatic output pressure as a function of the variation of one or more input pressures
NOTE 1 See Figure 1. SIST EN 15611:2009
EN 15611:2008 (E) 6
Key 1 first input pressure 2 second input pressure 3 control signal - continuous load sensing pressure (Lcp), or control signal - empty/load signal pressure (Lsp), or mechanical input (lever) or electrical input 4 auxiliary reservoir pressure, supply pressure (AR) 5 output pressure 6 relay valve Figure 1 — Relay valve, pressures and control signals NOTE 2 The definition of “relay valve” in EN 14478 is specific to a load dependant relay valve. This EN standard considers one or more input pressures in accordance with the diagram in Figure 1. 3.1.2 input pressure control pressure received by the relay valve NOTE Pressure generally considered as being the output pressure from a distributor or a brake control unit; sometimes referred to as pilot pressure or dummy brake cylinder pressure. 3.1.3 output pressure pressure output from the relay valve NOTE Pressure generally considered as being the brake cylinder pressure when the relay valve is used in a variable load braking system. This pressure can also be used as the input pressure to another relay valve. The output pressure can obtain one, two or three fixed levels or it can be changed continuously between a minimum and a maximum or vice versa. 3.1.4 relay valve ratio ratio of the output pressure to input pressure SIST EN 15611:2009
EN 15611:2008 (E) 7 3.1.5 control signal signal received from the continuous load sensing device (Lcp) or empty - loaded changeover device (Lsp) or a mechanical input (lever) or an electrical input that varies the relay valve ratio dependant on vehicle load NOTE This can also be a speed signal or other parameter, dependant on the relay valve application. 3.1.6 Relay valve types 3.1.6.1 single stage relay valve relay valve type A relay valve with one fixed relay valve ratio, where the ratio can be less (step-down), equal or greater (step-up) than 1 3.1.6.2 multi stage relay valve relay valve type B relay valve with more than one fixed relay valve ratio, where the ratios can be less (step-down), equal or greater (step-up) than 1 3.1.6.2.1 relay valve type B1 multi stage relay valve that can change relay valve ratio during a brake application NOTE Typically used on vehicles normally operated in empty or fully loaded condition. 3.1.6.2.2 relay valve type B2 multi stage relay valve where a change of relay valve ratio cannot take place during a brake application NOTE Blocking the relay valve ratio during brake application is typically used to avoid frequent changeovers taking place on vehicles operated near the changeover weight. 3.1.6.2.3 empty/load relay valve specific type of multi stage relay valve (type B1 or B2) with only two stages, giving an empty (tare) or a loaded output pressure proportional to input pressure dependant on the load signal input 3.1.6.3 variable load relay valve relay valve type C relay valve with a continuously changeable relay valve ratio, where a load signal is used to change the ratio 3.1.6.4 multi stage variable load relay valve relay valve type C1 relay valve with a continuously changeable relay valve ratio, where a load signal is used to change the ratio and with a multi stage feature added NOTE Typically a load signal is used to change the relay valve ratio and a control signal (automatic or manual) is used to change the stage(s). The typical result is that at the same load and input pressure, in the lower stage (e.g. P-mode, passenger train) results a lower output pressure and in a higher stage (e.g. R-mode, rapid passenger train) this results in a higher output pressure. 3.1.6.5 two (multi) input relay valve
relay valve type D relay valve (type A, B or C) with two (or more) input pressures, controlling a single output pressure SIST EN 15611:2009
EN 15611:2008 (E) 8 3.1.6.6 variable load relay valve with kinked characteristic relay valve type E variable load relay valve (Type C) with a special, non-linear characteristic, which automatically comes into operation when the vehicle has more than a certain load NOTE This function reduces (in comparison with a linear characteristic) the output pressure for low input pressures to a certain level to limit the heat impact to the wheels during continuous braking.
3.1.7 sensitivity change of input pressure causing a variation of output pressure, when the change of input pressure is in the same direction, with no overshoot or reversal 3.1.8 initial sensitivity change of input pressure, starting at 0 bar which causes the output pressure to start increasing
NOTE See Figure 2. 3.1.9 sensitivity at reversal change of input pressure causing a variation of output pressure, when the change of input pressure is changing its direction from increasing to decreasing
NOTE See Figure 2. 3.1.10 hysteresis difference in output pressure with the same input pressure, where the input pressure is first rising to a value and then, having been taken past that value, subsequently falls to the same value
NOTE See Figure 2. SIST EN 15611:2009
EN 15611:2008 (E) 9
Key 1 initial sensitivity 2 hysteresis 3 sensitivity at reversal NOTE The figure is simplified for illustrative purposes, e.g. the real pressure development is not shown. Figure 2 — Hysteresis and sensitivity 3.1.11 initial braking position first braking step corresponding to a reduction of the brake pipe pressure of 0,4 bar to 0,5 bar, which results in an input pressure to the relay valve of (0,7 ± 0,1) bar 3.1.12 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 Airflow is often stated in normal litres per minute (Nl/min). 3.2 Symbols p pressure pi input pressure po output pressure t time SIST EN 15611:2009
EN 15611:2008 (E) 10 3.3 Abbreviations BCP brake cylinder pressure Lcp
Control signal - continuous load sensing pressure Lsp
Control signal - empty/load signal pressure AR Auxiliary reservoir pressure, supply pressure 4 Design and manufacture 4.1 General 4.1.1 A relay valve shall enable a distributor valve to be used without any vehicle specific modification to the distributor, related to the brake cylinder volume. This includes the independence of the brake application and release times, the inshot feature and the output pressure development for any output (brake cylinder and piping) volume. 4.1.2 The use of a relay valve shall not alter any of the characteristics of the distributor and/or a brake control unit that are not specified in this standard. 4.1.3 The use of a relay valve shall enable the vehicle to maintain a nominally constant brake application or release time. 4.1.4 The use of a relay valve shall enable the brake cylinder pressure to be maintained between prescribed limits (e.g. interoperable or national). These limits may be defined by different brake modes or speed-dependent requirements or where there is a requirement to maintain a nominal constant brake mass percentage irrespective of load. 4.1.5 Table 1 below provides a description of relay valve types described in this standard with the relevant clause references. SIST EN 15611:2009
EN 15611:2008 (E) 11 Table 1 — Relay valve types and corresponding clauses Type Symbol Description Comment Definitions Clause Reference Functional Requirement Clauses Testing Clauses A One fixed relay valve ratio
3.1.6.1 Single stage relay valve 4.2.1 4.2.2.1 4.2.3 4.2.7 4.2.8 4.2.9 4.2.10 4.2.11 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 5 6.2.4.2 6.2.4.3 6.2.4.11 6.2.4.12 6.2.4.14 6.2.4.15 6.2.4.16 6.2.4.17 B – Basis of either B1 or B2 Types below Two or more fixed relay valve ratios Empty/loaded or
low/high 3.1.6.2 Multi stage relay valve 4.2.1 4.2.2.1 4.2.2.2 4.2.3 4.2.7
4.2.8 4.2.9
4.2.10 4.2.11 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 5 6.2.4.2 6.2.4.3 6.2.4.4 6.2.4.11 6.2.4.12 6.2.4.14 6.2.4.15 6.2.4.16 6.2.4.17 B1
Change of relay valve ratios required/allowed during brake application 3.1.6.2.1
As for Type B plus 4.2.4 As for type B plus 6.2.4.5 B2
Change of relay valve ratio not allowed during brake application 3.1.6.2.2
As for Type B plus 4.2.5 As for Type B plus 6.2.4.6C Continuously changing relay valve ratio
3.1.6.3 Variable load relay valve 4.2.1 4.2.2.1 4.2.3 4.2.5 4.2.7 4.2.8 4.2.9
4.2.10 4.2.11 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 5 6.2.4.2 6.2.4.3 6.2.4.6 6.2.4.7 6.2.4.8 6.2.4.12 6.2.4.14 6.2.4.15 6.2.4.16 6.2.4.17 C1
Continuously changing relay valve ratio, with a multi stage feature added 3.1.6.4 Multi stage variable load relay valve As for Type C plus 4.2.2.3 As for Type C plus 6.2.4.10 D Two or more input pressures with „select high“ feature overlay function to type A – C 3.1.6.5 Two (multi) input relay valveAs for Type A, B or C plus 4.2.2.4 As for Type A, B or C plus 6.2.4.13 E Kinked characteristic additional overlay function to type C 3.1.6.6 Variable load relay valve with kinked characteristic As for Type C plus 4.2.6 As for Type C plus 6.2.4.9 SIST EN 15611:2009
EN 15611:2008 (E) 12 4.2 Functional requirements 4.2.1 Minimum output pressure The minimum output pressure of the relay valve (brake cylinder pressure) shall be such that a minimum brake force of 10 % of the maximum brake force in all conditions of vehicle load, is achieved in response to a nominal input pressure of 0,7 bar (Initial braking position). Figure 3 gives an example of the output pressure of a relay valve for different conditions of vehicle load. NOTE The relay valve design may provide means to make the minimum output pressure changeable according to the requirements of different applications.
Key 1 empty condition 2 loaded condition 3 initial input pressure (0,7 ± 0,1) bar 4 initial output pressure loaded 5 initial output pressure unloaded Figure 3 — Example of the output pressure po of a relay valve (brake cylinder pressure) in relation to the input pressure pi for different conditions of vehicle load SIST EN 15611:2009
EN 15611:2008 (E) 13 4.2.2 Accuracy of the output pressure and changeover 4.2.2.1 General (type A, B1, B2, C, C1, E) The output pressure of the relay valve shall be within the following tolerances, related to the minimum (empty)/maximum (loaded) figures, given by the type plate and the installation drawing of the relay valve: ± 0,1 bar for nominal output pressures ≤ 3,8 bar at an input pressure of (3,8 ± 0,02) bar; ± 0,15 bar for nominal output pressures > 3,8 bar at an input pressure of (3,8 ± 0,02) bar. This requirement shall be tested in accordance with 6.2.4.4 (type B1 and B2), 6.2.4.7 (type C and C1), 6.2.4.9 (type E) and 6.2.4.11 (type A, B1 and B2). 4.2.2.2 Accuracy of the changeover of a two, or more, stage relay valve (type B, B1 and B2) The relay valve shall be designed to changeover from the empty (low), to intermediate (if applicable), and to the loaded (high) condition and reverse, as defined in 4.2.3, at nominal values of the load signal pressures (Lsp). The accuracy of the changeover shall be tested in accordance with 6.2.4.4. 4.2.2.3 Accuracy of the change of a variable load relay valve with a two stage function overlaid to the variable load brake function (type C1) It shall be possible at any input pressure and any load control pressure (Lcp) to change from a lower to a higher level of the output pressure or vice versa. The ratio of the gradient of the output to the input pressures between the higher value of the output pressure to the lower value shall be constant between initial and full service and within a tolerance of ± 10 % for any load condition; this condition is related to a nominal input pressure of 3,8 bar and shall be initiated by a pneumatic or electric control signal. This requirement shall be tested in accordance with 6.2.4.10. 4.2.2.4 Accuracy of the output pressure of a relay valve designed for two or more input pressures (type D) The output pressure of the relay valve shall correspond to the highest of the input pressures. The tolerance of the maximum output pressure nominal values shall be ± 0,1 bar, if the nominal value is ≤ 3,8 bar and ± 0,15 bar, if the nominal value is > 3,8 bar. In the case where two or more input pressures are acting simultaneously, the output pressure tolerance shall be a maximum of ± 0,20 bar, if the nominal value is ≤ 3,8 bar and ± 0,30 bar, if the nominal value is > 3,8 bar. This requirement shall be tested in accordance with 6.2.4.13. 4.2.3 Load signal characteristics
The design of the relay valve shall allow interaction with at least one of the following load signal types: a) manual empty-loaded signal, where this signal is provided by a lever, either mounted directly on the relay valve, or remotely operated on the vehicle to manually change from the low to the high output pressure, or vice versa; b) pneumatic empty/load signal, where the relay valve shall be designed to operate on receipt of the relevant signal pressure dependant on the brake system design, as follows: SIST EN 15611:2009
EN 15611:2008 (E) 14 1) Where the changeover device is supplied from the AR, and Lsp/Lcp pressure is ≤ 0,5 bar this indicates a load that is less than the switching point and shall cause the relay valve to output its lower ratio. If Lsp/Lcp pressure is ≥ 3,0 bar this indicates a load greater than the switching point and shall cause the relay valve to output its higher ratio. 2) Where the changeover device is supplied from the BCP, the Lsp/Lcp indicating the loaded condition can either be 0 bar or equivalent to the brake cylinder pressure and shall cause relay valve to output its higher ratio. NOTE The signal pressure is typically supplied as a load control signal pressure (Lsp) from a manually operated pneumatic device e.g. a changeover cock, or an automatic empty-loaded changeover device. Alternatively it is supplied as a continuous load sensing pressure (Lcp). c) variable load signal, i.e. where the load sensing pressure (Lcp) comes from an automatic continuously variable load sensing device (weighing valve) giving continuous load information. See EN 15625. 4.2.4 Enabling of a change of relay valve ratio during brake application of a relay valve of type B1 Whilst the brakes are applied with a brake cylinder pressure > 1 bar, changes of the load sensing pressure (Lcp or Lsp) outside the limits of ≤ 0,5 bar and ≥ 3 bar shall initiate the change of the relay valve ratio. For relay valves designated for a changeover duri
...
SLOVENSKI STANDARD
kSIST prEN 15611:2008
Železniške naprave - Zavore - Ventili za kontrolo tlaka
Railway applications - Braking - Relay valves
Bahnanwendungen - Bremse - Relaisventile
Ta slovenski standard je istoveten z: prEN 15611
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
kSIST prEN 15611:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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kSIST prEN 15611:2008
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kSIST prEN 15611:2008
EUROPEAN STANDARD
FINAL DRAFT
prEN 15611
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2008
ICS 45.060.01
English Version
Railway applications - Braking - Relay valves
This draft European Standard is submitted to CEN members for formal vote. 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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15611:2008: E
worldwide for CEN national Members.
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kSIST prEN 15611:2008
prEN 15611:2008 (E)
Contents Page
Foreword.4
1 Scope.5
2 Normative references.5
3 Symbols, abbreviations, terms and definitions.5
3.1 Symbols.5
3.2 Abbreviations.6
3.3 Terms and definitions .6
4 Design and manufacture.9
4.1 General.9
4.2 Functional requirements.12
4.2.1 Minimum output pressure.12
4.2.2 Accuracy of the output pressure and changeover.13
4.2.3 Load signal characteristics.13
4.2.4 Enabling of a change of relay valve ratio during brake application of a relay valve of
type B1 .14
4.2.5 Prevention of a change of relay valve ratio during brake application of a relay valve of
type B2 and a variable load relay valve, types C, C1, D, E .14
4.2.6 Kinked characteristic of a variable load relay valve (type E) .14
4.2.7 Interaction of a relay valve and a distributor valve.15
4.2.8 Hysteresis.16
4.2.9 Sensitivity.16
4.2.10 Flow.16
4.2.11 Leakage.16
4.2.12 Change of relay valve ratio.16
4.3 Vibrations and shock .17
4.4 Environment requirements.17
4.4.1 General.17
4.4.2 Temperature.17
4.4.3 Other environmental conditions.18
4.5 Compressed air quality .19
4.6 Service life.20
4.7 Fire behaviour.20
4.8 External appearance.20
4.9 Design requirements regarding pressure stress .20
4.10 Interface.20
4.10.1 General.20
4.10.2 Mechanical.20
4.10.3 Pneumatic.20
5 Materials.21
6 Type tests.21
6.1 General.21
6.2 Individual relay valve tests .21
6.2.1 Test bench for individual relay valves.21
6.2.2 Sampling for type tests .24
6.2.3 Test temperature and air quality .24
6.2.4 Procedure for type tests .24
7 Routine test and inspection.47
8 Type-validation.47
2
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kSIST prEN 15611:2008
prEN 15611:2008 (E)
9 Documentation.47
10 Designation.48
11 Identification and marking.48
Annex A (informative) In-service trial .49
A.1 General.49
A.2 Test set-up and sampling .49
A.3 Procedure.49
A.4 Pass/fail criteria.49
Annex B (informative) Static vehicle and running tests .50
B.1 General.50
B.2 Test recommendations.50
B.2.1 Variable load relay valve.50
B.2.2 Empty/load relay valve.51
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 96/48/EC as modified by Directive 2004/50/EC.52
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2001/16/EC of the European Parliament and of the Council
of 19 March 2001 on the interoperability of the trans-European conventional rail system,
as modified by EU Directive 2004/50/EC of 29 April 2004 .53
Bibliography.54
3
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kSIST prEN 15611:2008
prEN 15611:2008 (E)
Foreword
This document (prEN 15611:2008) 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 Formal Vote.
This European Standard has been prepared under a mandate given to CEN/CENELEC/ETSI by the European
Commission and the European Free Trade Association to support Essential Requirements of EU Directive
96/48 and EU Directive 2001/16, as modified by EU Directive 2004/50.
For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this
document.
4
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kSIST prEN 15611:2008
prEN 15611:2008 (E)
1 Scope
This European Standard is applicable to relay valves designed to control the brake cylinder pressure of
compressed air brakes fitted to railway vehicles, in association with an air brake distributor valve or other
control device, and in response to a change in vehicle load that is either continuously variable or in two stages
i.e. empty - loaded.
Relay valves operating with other pressures, in particular the brake pipe pressure, are not included.
This European Standard specifies the requirements for the design, manufacture and testing of relay valves.
2 Normative references
The following referenced documents are indispensable for the application 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 14478:2005, Railway applications — Braking — Generic vocabulary
prEN 15355, Railway applications - Braking - Distributor valves and distributor-isolating devices
prEN 15625, Railway applications — Braking — Automatic variable load-sensing devices
EN 50125-1, Railway applications — Environmental conditions for equipment — Part 1: Equipment on board
rolling stock
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 61373:1999, Railway applications — Rolling stock equipment — Shock and vibration tests
(IEC 61373:1999)
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000)
ISO 8573-1:2001, Compressed air for general use — Part 1: Contaminants and quality classes
3 Symbols, abbreviations, terms and definitions
For the purposes of this document, the abbreviations, terms and definitions given in EN 14478:2005 and the
following apply.
3.1 Symbols
p pressure
p input pressure
i
p output pressure
o
t time
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3.2 Abbreviations
BCP brake cylinder pressure
Lcp Control signal - continuous load sensing pressure
Lsp Control signal - empty/load signal pressure
AR Auxiliary reservoir pressure, supply pressure
3.3 Terms and definitions
3.3.1
relay valve
device, the main function of which is to control a pneumatic output pressure as a function of the variation of
one or more input pressures (see Figure 1)
Key
1 first input pressure
2 second input pressure
3 control signal - continuous load sensing pressure (Lcp), or control signal - empty/load signal pressure (Lsp), or
mechanical input (lever) or electrical input
4 auxiliary reservoir pressure, supply pressure (AR)
5 output pressure
6 relay valve
Figure 1 — Relay valve, pressures and control signals
NOTE The definition of “relay valve” in EN 14478 is specific to a load dependant relay valve. This EN standard
considers one or more input pressures in accordance with the diagram in Figure 1.
3.3.2
input pressure
control pressure received by the relay valve
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NOTE Pressure generally considered as being the output pressure from a distributor or a brake control unit;
sometimes referred to as pilot pressure or dummy brake cylinder pressure
3.3.3
output pressure
pressure output from the relay valve
NOTE Pressure generally considered as being the brake cylinder pressure when the relay valve is used in a variable
load braking system. This pressure can also be used as the input pressure to another relay valve. The output pressure
can obtain one, two or three fixed levels or it can be changed continuously between a minimum and a maximum or vice
versa.
3.3.4
relay valve ratio
ratio of the output pressure to input pressure
3.3.5
control signal
signal received from the continuous load sensing device (Lcp) or empty - loaded changeover device (Lsp) or a
mechanical input (lever) or an electrical input that varies the relay valve ratio dependant on vehicle load
NOTE This can also be a speed signal or other parameter, dependant on the relay valve application.
3.3.6 Relay valve types
3.3.6.1
single stage relay valve
relay valve type A
relay valve with one fixed relay valve ratio, where the ratio can be less (step-down), equal or greater (step-up)
than 1
3.3.6.2
multi stage relay valve
relay valve type B
relay valve with more than one fixed relay valve ratio, where the ratios can be less (step-down), equal or
greater (step-up) than 1
3.3.6.2.1
relay valve type B1
multi stage relay valve that can change relay valve ratio during a brake application
NOTE Typically used on vehicles normally operated in empty or fully loaded condition.
3.3.6.2.2
relay valve type B2
multi stage relay valve where a change of relay valve ratio cannot take place during a brake application
NOTE Blocking the relay valve ratio during brake application is typically used to avoid frequent changeovers taking
place on vehicles operated near the changeover weight.
3.3.6.2.3
empty/load relay valve
specific type of multi stage relay valve (type B1 or B2) with only two stages, giving an empty (tare) or a loaded
output pressure proportional to input pressure dependant on the load signal input
3.3.6.3
variable load relay valve
relay valve type C
relay valve with a continuously changeable relay valve ratio, where a load signal is used to change the ratio
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3.3.6.4
multi stage variable load relay valve
relay valve type C1
relay valve with a continuously changeable relay valve ratio, where a load signal is used to change the ratio
and with a multi stage feature added
NOTE Typically a load signal is used to change the relay valve ratio and a control signal (automatic or manual) is
used to change the stage(s). The typical result is that at the same load and input pressure, in the lower stage (e.g. P-mode,
passenger train) results a lower output pressure and in a higher stage (e.g. R-mode, rapid passenger train) this results in a
higher output pressure.
3.3.6.5
two (multi) input relay valve
relay valve type D
relay valve (type A, B or C) with two (or more) input pressures, controlling a single output pressure
3.3.6.6
variable load relay valve with kinked characteristic
relay valve type E
variable load relay valve (Type C) with a special, non-linear characteristic, which automatically comes into
operation when the vehicle has more than a certain load
NOTE This function reduces (in comparison with a linear characteristic) the output pressure for low input pressures to
a certain level to limit the heat impact to the wheels during continuous braking.
3.3.7
sensitivity
change of input pressure causing a variation of output pressure, when the change of input pressure is in the
same direction, with no overshoot or reversal
3.3.8
initial sensitivity
change of input pressure, starting at 0 bar which causes the output pressure to start increasing (see Figure 2)
3.3.9
sensitivity at reversal
change of input pressure causing a variation of output pressure, when the change of input pressure is
changing its direction from increasing to decreasing (see Figure 2)
3.3.10
hysteresis
difference in output pressure with the same input pressure, where the input pressure is first rising to a value
and then, having been taken past that value, subsequently falls to the same value (see Figure 2)
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Key
1 initial sensitivity
2 hysteresis
3 sensitivity at reversal
NOTE The figure is simplified for illustrative purposes, e.g. the real pressure development is not shown.
Figure 2 — Hysteresis and sensitivity
3.3.11
initial braking position
first braking step corresponding to a reduction of the brake pipe pressure of 0,4 bar to 0,5 bar, which results in
an input pressure to the relay valve of (0,7 ± 0,1) bar
3.3.12
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 Airflow is often stated in normal litres per minute (Nl/min).
4 Design and manufacture
4.1 General
4.1.1 A relay valve shall enable a distributor valve to be used without any vehicle specific modification to the
distributor, related to the brake cylinder volume. This includes the independence of the brake application and
release times, the inshot feature and the output pressure development for any output (brake cylinder and
piping) volume.
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4.1.2 The use of a relay valve shall not alter any of the characteristics of the distributor and/or a brake
control unit that are not specified in this standard.
4.1.3 The use of a relay valve shall enable the vehicle to maintain a nominally constant brake application or
release time.
4.1.4 The use of a relay valve shall enable the brake cylinder pressure to be maintained between
prescribed limits (e.g. interoperable or national). These limits may be defined by different brake modes or
speed-dependent requirements or where there is a requirement to maintain a nominal constant brake mass
percentage irrespective of load.
4.1.5 Table 1 below provides a description of relay valve types described in this standard with the relevant
clause references.
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Table 1 — Relay valve types and corresponding clauses
Type Description Comment Definitions Functional Testing
Symbol Clause Requirement
Clauses
Reference Clauses
A One fixed relay 3.3.6.1 4.2.1 4.2.2.1 6.2.4.2 6.2.4.3
valve ratio
Single stage 4.2.3 4.2.7 6.2.4.11 6.2.4.12
relay valve 4.2.8 4.2.9 6.2.4.14 6.2.4.15
4.2.10 4.2.11 6.2.4.16 6.2.4.17
4.3 4.4
4.5 4.6
4.7 4.8
4.9 4.10
5
B – Basis Two or more Empty/loaded or 3.3.6.2 4.2.1 4.2.2.1 6.2.4.2 6.2.4.3
of either fixed relay valve
low/high Multi stage relay 4.2.2.2 4.2.3 6.2.4.4 6.2.4.11
B1 or B2 ratios valve
4.2.7 4.2.8 6.2.4.12 6.2.4.14
Types
4.2.9 4.2.10 6.2.4.15 6.2.4.16
below
4.2.11 6.2.4.17
4.3 4.4
4.5 4.6
4.7 4.8
4.9 4.10
5
B1 Change of relay valve 3.3.6.2.1 As for Type B plus As for type B plus 6.2.4.5
ratios required/allowed 4.2.4
during brake
application
B2 Change of relay valve 3.3.6.2.2 As for Type B plus As for Type B plus 6.2.4.6
ratio not allowed 4.2.5
during brake
application
C Continuously 3.3.6.3 4.2.1 4.2.2.1 6.2.4.2 6.2.4.3
changing relay Variable load 4.2.3 4.2.5 6.2.4.6 6.2.4.7
valve ratio
relay valve 4.2.7 4.2.8 6.2.4.8
4.2.9 4.2.10 6.2.4.12 6.2.4.14
4.2.11 6.2.4.15 6.2.4.16
4.3 4.4 6.2.4.17
4.5 4.6
4.7 4.8
4.9 4.10
5
C1 Continuously changing 3.3.6.4 As for Type C plus As for Type C plus
relay valve ratio, with a 4.2.2.3 6.2.4.10
Multi stage
multi stage feature variable load
added relay valve
D Two or more overlay function to 3.3.6.5 As for Type A, B or As for Type A, B or C plus
input pressures type A – C C plus 4.2.2.4 6.2.4.13
Two (multi)
with „select input relay valve
high“ feature
E Kinked additional overlay 3.3.6.6 As for Type C plus As for Type C plus 6.2.4.9
characteristic function to type C Variable load 4.2.6
relay valve with
kinked
characteristic
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4.2 Functional requirements
4.2.1 Minimum output pressure
The minimum output pressure of the relay valve (brake cylinder pressure) shall be such that a minimum brake
force of 10 % of the maximum brake force in all conditions of vehicle load, is achieved in response to a
nominal input pressure of 0,7 bar (Initial braking position). Figure 3 gives an example of the output pressure of
a relay valve for different conditions of vehicle load.
NOTE The relay valve design may provide means to make the minimum output pressure changeable according to
the requirements of different applications.
Key
1 empty condition
2 loaded condition
3 initial input pressure (0,7 ± 0,1) bar
4 initial output pressure loaded
5 initial output pressure unloaded
Figure 3 — Example of the output pressure p of a relay valve (brake cylinder pressure) in relation to
o
the input pressure p for different conditions of vehicle load
i
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4.2.2 Accuracy of the output pressure and changeover
4.2.2.1 General (type A, B1, B2, C, C1, E)
The output pressure of the relay valve shall be within the following tolerances, related to the minimum
(empty)/maximum (loaded) figures, given by the type plate and the installation drawing of the relay valve:
± 0,1 bar for nominal output pressures ≤ 3,8 bar at an input pressure of (3,8 ± 0,02) bar;
± 0,15 bar for nominal output pressures > 3,8 bar at an input pressure of (3,8 ± 0,02) bar.
This requirement shall be tested in accordance with 6.2.4.4 (type B1 and B2), 6.2.4.7 (type C and C1), 6.2.4.9
(type E) and 6.2.4.11 (type A, B1 and B2).
4.2.2.2 Accuracy of the changeover of a two, or more, stage relay valve (type B, B1 and B2)
The relay valve shall be designed to changeover from the empty (low), to intermediate (if applicable), and to
the loaded (high) condition and reverse, as defined in 4.2.3, at nominal values of the load signal pressures
(Lsp).
The accuracy of the changeover shall be tested in accordance with 6.2.4.4.
4.2.2.3 Accuracy of the change of a variable load relay valve with a two stage function overlaid to
the variable load brake function (type C1)
It shall be possible at any input pressure and any load control pressure (Lcp) to change from a lower to a
higher level of the output pressure or vice versa.
The ratio of the gradient of the output to the input pressures between the higher value of the output pressure
to the lower value shall be constant between initial and full service and within a tolerance of ± 10 % for any
load condition; this condition is related to a nominal input pressure of 3,8 bar and shall be initiated by a
pneumatic or electric control signal.
This requirement shall be tested in accordance with 6.2.4.10.
4.2.2.4 Accuracy of the output pressure of a relay valve designed for two or more input pressures
(type D)
The output pressure of the relay valve shall correspond to the highest of the input pressures. The tolerance of
the maximum output pressure nominal values shall be ± 0,1 bar, if the nominal value is ≤ 3,8 bar and
± 0,15 bar, if the nominal value is > 3,8 bar. In the case where two or more input pressures are acting
simultaneously, the output pressure tolerance shall be a maximum of ± 0,20 bar, if the nominal value is
≤ 3,8 bar and ± 0,30 bar, if the nominal value is > 3,8 bar.
This requirement shall be tested in accordance with 6.2.4.13.
4.2.3 Load signal characteristics
The design of the relay valve shall allow interaction with at least one of the following load signal types:
a) manual empty-loaded signal, where this signal is provided by a lever, either mounted directly on the relay
valve, or remotely operated on the vehicle to manually change from the low to the high output pressure,
or vice versa;
b) pneumatic empty/load signal, where the relay valve shall be designed to operate on receipt of the
relevant signal pressure dependant on the brake system design, as follows:
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1) Where the changeover device is supplied from the AR, and Lsp/Lcp pressure is ≤ 0,5 bar this
indicates a load that is less than the switching point and shall cause the relay valve to output its lower
ratio. If Lsp/Lcp pressure is ≥ 3,0 bar this indicates a load greater than the switching point and shall
cause the relay valve to output its higher ratio.
2) Where the changeover device is supplied from the BCP, the Lsp/Lcp indicating the loaded condition
can either be 0 bar or equivalent to the brake cylinder pressure and shall cause relay valve to output
its higher ratio.
NOTE The signal pressure is typically supplied as a load control signal pressure (Lsp) from a manually
operated pneumatic device e.g. a changeover cock, or an automatic empty-loaded changeover device. Alternatively it
is supplied as a continuous lo
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