SIST EN 15611:2020/kFprA1:2022
(Amendment)Railway applications - Braking - Relay valves
Railway applications - Braking - Relay valves
This document is applicable to relay valves designated 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. It covers one stage relay valves and relay valves adjusting the brake cylinder pressure in response to a change in vehicle speed or load that is either continuously variable or in two or more stages, i.e. empty – loaded.
Relay valves operating with other pressures, in particular the brake pipe pressure, are not included.
This document specifies the requirements for the design, manufacture and testing of relay valves.
Bahnanwendungen - Bremse - Relaisventile
Applications ferroviaires - Freinage - Relais pneumatiques
Železniške naprave - Zavore - Ventili za kontrolo tlaka - Dopolnilo A1
General Information
Relations
Overview
EN 15611:2020/FprA1 (CEN) is a European standard amendment addressing relay valves used in railway braking systems. It applies to relay valves that control the brake cylinder pressure of compressed‑air brakes on railway vehicles when used in conjunction with an air brake distributor valve or other control device. The document covers both one‑stage relay valves and relay valves that adjust brake cylinder pressure in response to vehicle speed or load (continuously variable or multi‑stage: e.g., empty–loaded). Valves that operate with other control pressures (notably the brake pipe) are excluded. The amendment updates normative references, test sequences, sensitivity and fire‑behaviour references, and Annex ZA alignment with EU interoperability requirements.
Key topics and technical requirements
- Scope and valve types: One‑stage and speed/load‑responsive relay valves; exclusion of valves driven by other pressures (e.g., brake pipe).
- Design, manufacture and testing: Specifies requirements manufacturers and test houses must follow for safe, reliable relay valve performance.
- Sensitivity requirements: Updated sensitivity thresholds for relay valves with a ratio ≥ 1 at ambient temperature (25 ± 10 °C):
- ≤ 0.10 bar for types A, B1, B2, C1
- ≤ 0.20 bar for types AD, C2, C1D, C2D, E
- Test sequences and timing: Revisions to dynamic test sequences (for example, input pressure increase timing changed to (4.0 ± 1.0) s in specific test steps).
- Fire behaviour: Normative reference updated to EN 45545‑2:2020 for fire performance requirements and assessment.
- Pass/fail criteria and documentation: Clarified language (e.g., “tested relay valve type”) and alignment of test acceptance criteria.
- Regulatory alignment: Revised Annex ZA to clarify the relationship with Directive (EU) 2016/797 and the Rolling Stock TSI (Commission Regulation (EU) No 1302/2014), supporting interoperability conformity routes.
Applications and who uses it
- Relay valve manufacturers - design, prototype validation, and production testing to meet European railway safety and interoperability expectations.
- Railway vehicle OEMs and system integrators - selecting and specifying compliant relay valves for locomotives and passenger rolling stock.
- Test laboratories and certification bodies - performing type tests, environmental tests, fire tests and issuing conformity reports.
- Infrastructure and fleet operators / purchasers - ensuring supplied components meet safety and TSI‑aligned standards for procurement and maintenance.
- Regulatory and conformity assessors - using the standard as a presumption of conformity for Essential Requirements under Directive (EU) 2016/797 once cited in the Official Journal.
Related standards and references
- EN 15611:2020 (base standard) and this draft amendment FprA1/prA1
- EN 45545‑2:2020 (fire behaviour of railway materials and components)
- Directive (EU) 2016/797 and Rolling Stock TSI (Commission Regulation (EU) No 1302/2014) - Annex ZA maps EN 15611 clauses to TSI Essential Requirements
- Developed by CEN/TC 256 (Railway applications)
Keywords: EN 15611:2020/FprA1, relay valves, railway braking, brake cylinder pressure, compressed air brakes, EN 45545‑2:2020, railway standard, TSI, design manufacture testing.
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 15611:2020/oprA1:2021
01-september-2021
Železniške naprave - Zavore - Ventili za kontrolo tlaka - Dopolnilo A1
Railway applications - Braking - Relay valves
Bahnanwendungen - Bremse - Relaisventile
Applications ferroviaires - Freinage - Relais pneumatiques
Ta slovenski standard je istoveten z: EN 15611:2020/prA1
ICS:
23.060.99 Drugi ventili Other valves
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
SIST EN 15611:2020/oprA1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN 15611:2020/oprA1:2021
SIST EN 15611:2020/oprA1:2021
DRAFT
EUROPEAN STANDARD
EN 15611:2020
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
June 2021
ICS 45.040
English Version
Railway applications - Braking - Relay valves
Applications ferroviaires - Freinage - Relais Bahnanwendungen - Bremse - Relaisventile
pneumatiques
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 256.
This draft amendment A1, if approved, will modify the European Standard EN 15611:2020. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.
This draft amendment 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, 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.
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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15611:2020/prA1:2021 E
worldwide for CEN national Members.
SIST EN 15611:2020/oprA1:2021
EN 15611:2020/prA1:2021 (E)
Contents Page
European foreword . 3
1 Modification to Clause 2, "Normative references" . 4
2 Modification to 5.2.10, "Sensitivity" . 4
3 Modification to 5.7, "Fire behaviour" . 4
4 Modification to 7.2.4.6.2, "Test sequence" . 4
5 Modification to 7.2.4.7.2, "Test sequence" . 4
6 Modification to 7.2.4.9.3, "Pass/fail criteria". 4
7 Modification to 7.2.4.14.2, "Test sequence" . 4
8 Modification to 7.2.4.14.3, "Pass/fail criteria" . 4
9 Modifications to Annex ZA (informative), "Relationship between this European Standard
and the essential requirements of Directive 2008/57/EC aimed to be covered" . 4
SIST EN 15611:2020/oprA1:2021
EN 15611:2020/prA1:2021 (E)
European foreword
This document (EN 15611:2020/prA1:2021) 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 has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Ass
...
Frequently Asked Questions
SIST EN 15611:2020/kFprA1:2022 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Railway applications - Braking - Relay valves". This standard covers: This document is applicable to relay valves designated 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. It covers one stage relay valves and relay valves adjusting the brake cylinder pressure in response to a change in vehicle speed or load that is either continuously variable or in two or more stages, i.e. empty – loaded. Relay valves operating with other pressures, in particular the brake pipe pressure, are not included. This document specifies the requirements for the design, manufacture and testing of relay valves.
This document is applicable to relay valves designated 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. It covers one stage relay valves and relay valves adjusting the brake cylinder pressure in response to a change in vehicle speed or load that is either continuously variable or in two or more stages, i.e. empty – loaded. Relay valves operating with other pressures, in particular the brake pipe pressure, are not included. This document specifies the requirements for the design, manufacture and testing of relay valves.
SIST EN 15611:2020/kFprA1:2022 is classified under the following ICS (International Classification for Standards) categories: 23.060.99 - Other valves; 45.040 - Materials and components for railway engineering. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 15611:2020/kFprA1:2022 has the following relationships with other standards: It is inter standard links to SIST EN 15611:2020+A1:2023, SIST EN 15611:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 15611:2020/kFprA1:2022 is associated with the following European legislation: EU Directives/Regulations: 2016/797/EU; Standardization Mandates: M/483. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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