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.

Cross References:
ISO 8573-1:2010
EN ISO 228-1:2003
EN 60721-3-5:1997
EN 45545-2:2013+A1:2015
EN 15355:2019
EN 14478:2017
EN 45545-1:2013
EN 61373:2010/AC:2017-09
EN 50125-1:2014
EN 15625:2008+A1:2010
DIN 1343
ISO 2533
EN ISO 228-2


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