EN 15355:2019/FprA1

Railway applications - Braking - Distributor valves and distributor-isolating devices

This document applies to distributor valves and distributor-isolating devices.
The distributor valves contained in this document are of graduable release type. Direct release types are not included.
Functionally they are regarded as not containing relay valves of any type, even if the relay valves are physically an integral part of the distributor valves.
This document applies to both distributor-isolating devices mounted separate from the distributor valve and distributor-isolating devices integral with the distributor valve.
This document specifies the requirements for the design, testing and quality assurance of distributor valves and distributor-isolating devices.
The distributor valve and distributor-isolating device are intended to be part of a brake system mounted in a vehicle with maximum length of 31 m and maximum brake pipe volume of 25 l taking into consideration brake pipe inner diameters between 25 mm and 32 mm.

Bahnanwendungen - Bremse - Steuerventile und Bremsabsperreinrichtungen

Applications ferroviaires - Freinage - Distributeurs de freinage et robinet d'isolement

Železniške naprave - Zavore - Krmilni ventili in naprave za ločitev krmilnih ventilov od zavornega voda - Dopolnilo A1

General Information

• Status: Not Published
• Publication Date: 22-Jan-2023
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: CEN/TC 256 - Railway applications
• Drafting Committee: CEN/TC 256/SC 3/WG 47 - Braking
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 24-Nov-2022
• Due Date: 12-Oct-2022
• Completion Date: 24-Nov-2022
• Directive: 2016/797/EU - Directive (EU) 2016/797 of the European Parliament and of the Council of 11 May 2016 on the interoperability of the rail system within the European Union (Text with EEA relevance)
• Mandate: M/483 - Mandate for programming and standardisation addressed to the European standardisation bodies under directive 2008/57/EC in the field of the interoperability of the rail system within the European Union
• Ref Project: SIST EN 15355:2019/kFprA1:2022 - Railway applications - Braking - Distributor valves and distributor-isolating devices

Relations

• Merged Into: EN 15355:2019+A1:2023 - Railway applications - Braking - Distributor valves and distributor-isolating devices
• Effective Date: 22-Mar-2023
• Amends: EN 15355:2019 - Railway applications - Braking - Distributor valves and distributor-isolating devices
• Effective Date: 30-Sep-2020

Overview

EN 15355:2019/FprA1 (CEN) addresses distributor valves and distributor‑isolating devices used in railway braking systems. The amendment clarifies scope and testing requirements for graduable‑release distributor valves (direct release types are excluded) and for distributor‑isolating devices whether mounted separately or integral with the distributor valve. The standard specifies requirements for design, testing and quality assurance and applies to systems mounted in vehicles with a maximum length of 31 m and a maximum brake pipe volume of 25 L, considering brake pipe inner diameters between 25 mm and 32 mm.

Key Topics

• Scope and exclusions: Only graduable‑release distributor valves are covered; direct release types are explicitly excluded. Devices are functionally regarded as not containing relay valves even if relay valves are physically integral.
• Design and QA requirements: Clauses address design verification, type testing and quality assurance processes required for compliance.
• Test conditions and pass/fail criteria: The amendment refines test pressures and timing tolerances for emergency braking. It introduces proportional rescaling for output pressures and build‑up/release times where output is controlled by control chamber pressure.
• Specified performance figures: The amendment retains a maximum emergency output pressure of (3,80 ± 0,10) bar and revises build‑up and release time ranges by brake mode: G and P values are updated (for example, G build‑up (24,0 ± 6,0) s; P build‑up (4,0 ± 1,0) s; G release (52,5 ± 7,5) s; P release (17,5 ± 2,5) s). Table values for emergency braking at nominal input pressures are also provided in the amendment.
• Operational details: For distributor valves designed for dual‑pipe applications where the auxiliary reservoir is supplied only from the main reservoir pipe (MRP), tests are to be carried out with the MRP supply at (10,00 ± 0,50) bar.
• Human interface: Annex D defines mandatory handle shapes for manual release functions (round, oval and an identified handle for automatic manual release with an embossed or engraved "autom" plate).
• Regulatory linkage: References updated to Directive (EU) 2016/797 and Annex ZA links the standard to relevant TSI clauses for interoperability.

Applications

This standard is intended for:

• Manufacturers of distributor valves and distributor‑isolating devices for rolling stock
• Railway systems engineers responsible for brake system design and verification
• Test laboratories performing type and production tests for brake control components

Practical benefits include clearer test requirements, harmonised QA expectations, and defined human‑interface features to support safe operation and interoperability within EU rail systems.

Related Standards

• Technical Specification for Interoperability (TSI) references as listed in Annex ZA (relating to Directive (EU) 2016/797)
• Other EN standards on braking subsystems and environmental conditions may apply depending on vehicle type and system integration

For procurement, compliance and conformity assessment, use EN 15355:2019/prA1 as the reference document and consult national standards bodies for the adopted national version and Official Journal citations.

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 15355:2019/oprA1:2021
01-november-2021
Železniške naprave - Zavore - Krmilni ventili in naprave za ločitev krmilnih ventilov
od zavornega voda - Dopolnilo A1
Railway applications - Braking - Distributor valves and distributor-isolating devices
Bahnanwendungen - Bremse - Steuerventile und Bremsabsperreinrichtungen
Applications ferroviaires - Freinage - Distributeurs de freinage et robinet d'isolement
Ta slovenski standard je istoveten z: EN 15355:2019/prA1
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
SIST EN 15355:2019/oprA1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 15355:2019/oprA1:2021
SIST EN 15355:2019/oprA1:2021
DRAFT
EUROPEAN STANDARD
EN 15355:2019
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
September 2021
ICS 45.060.01
English Version
Railway applications - Braking - Distributor valves and
distributor-isolating devices
Applications ferroviaires - Freinage - Distributeurs de Bahnanwendungen - Bremse - Steuerventile und
freinage et robinet d'isolement Bremsabsperreinrichtungen
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 15355:2019. 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 15355:2019/prA1:2021 E
worldwide for CEN national Members.

SIST EN 15355:2019/oprA1:2021
EN 15355:2019/prA1:2021 (E)
Contents
European foreword . 3
1 Modification to European foreword . 4
2 Modification to 6.3.1, General . 4
3 Modification to 6.3.5.3, Pass/fail criteria . 4
4 Modification to 6.3.8.1 Requirements . 5
5 Modification to 6.3.16.1, Requirements . 6
6 Modification to 6.3.21.2, Tests . 6
7 Creation of Annex D . 6
8 Modifications to Annex ZA . 8

SIST EN 15355:2019/oprA1:2021
EN 15355:2019/prA1:2021 (E)
European foreword
This document (EN 15355:2019/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 Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
SIST EN 15355:2019/oprA1:2021
EN 15355:2019/prA1:2021 (E)
1 Modification to European foreword
Change “EU Directive 2008/57/EC” to “Directive (EU) 2016/797”.
2 Modification to 6.3.1, General
Change 5th paragraph:
“For other distributor valves, designed for dual pipe application only, where the auxiliary reservoir
volume is supplied by the main reservoir pipe (MRP) only, the tests shall be performed with supply from
the main reservoir pipe.”
to
“For other distributor valves, designed for dual pipe application only, where the auxiliary reservoir
volume is supplied by the main reservoir pipe (MRP) only, the tests shall be performed with supply from
the main reservoir pipe at a pressure of (10,00 ± 0,50) bar.“
3 Modification to 6.3.5.3, Pass/fail criteria
Change sentence:
“The pass/fail criteria shall be in accordance with those of the referred tests except for the maximum
output pressure and build-up and release times. The tolerance of ±20 % of the nominal values of build-
up and release time and output pressure is allowed when the input pressure is (4,00 + 0,10/-0) bar and
(6,00 + 0/-0,10) bar.“
to the following text and new Table 2:
“For distributor valves for which output pressure is limited in an absolute manner (i.e; independent from
the input pressure and in consequence from the pressure level in the control chamber as long as the
pressure in the auxiliary reservoir is sufficient to reach the maximum output pressure), the pass/fail
criteria shall be in accordance with those of the referred tests.
For distributor valves for which output pressure is controlled by the control chamber pressure (i.e;
proportional to the input pressure), the pass/fail criteria shall be in accordance with those of the referred
tests except for the maximum output pressure and build-up and release times. A proportional rescaling
related to the nominal working pressure shall be applied to the
...