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BS EN 15624:2021

BS EN 15624:2021

$167.15

Railway applications. Braking. Empty-loaded changeover devices

Published By Publication Date Number of Pages
BSI 2021 34
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This document is applicable to empty-loaded changeover devices. The purpose of such devices is the generation of a load-related signal which causes the brake performance to be adjusted to the current vehicle mass.

The manually operated empty-loaded changeover devices change their output signal according to the position of the handles which together with the associated changeover plates serve as interfaces. The changeover plates read the required information for the operation of the empty-loaded changeover devices, i.e. brake weights for each position and the relevant changeover mass of the vehicle.

Automatic empty-loaded changeover devices sense a certain load threshold of the vehicle to automatically adjust the output signal when the mass of a vehicle reaches a defined value. This threshold is the changeover mass. Below this mass the vehicle’s brake system provides a reduced brake force. For the changeover mass or more the high brake force applies.

This document specifies the requirements for the design, testing and quality assurance of empty-loaded changeover devices.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
2 Normative references
8 3 Terms and definitions
9 4 Design and manufacture
4.1 General
4.2 Functional requirements
4.2.1 General
10 4.2.2 Automatic empty-loaded changeover device
4.2.2.1 General
4.2.2.2 Changeover response
4.2.2.3 Empty to loaded changeover
11 4.2.2.4 Loaded to empty changeover
4.2.3 Pneumatic device characteristics
12 4.2.4 Automatic hydraulic to pneumatic converter
4.2.5 Automatic elastomeric to pneumatic converter
4.2.6 Components for operation of the manual empty-loaded changeover device
13 4.3 Shock and vibration
4.4 Environmental conditions
4.4.1 General
4.4.2 Ambient temperature
4.4.3 Altitude
4.4.4 Humidity
14 4.4.5 Rain
4.4.6 Snow, ice and hail
4.4.7 Solar radiation
4.4.8 Pollution
4.5 Design requirements regarding pressure stress
4.6 Tightness
15 4.7 Service life
4.8 Compressed air quality
4.9 Fire behaviour
4.10 External appearance
4.11 Pneumatic interfaces
5 Type tests
5.1 General
16 5.2 Individual automatic empty-loaded changeover device type tests
5.2.1 Test bench for individual automatic empty-loaded changeover device type tests
5.2.2 Sampling for type tests
5.2.3 Test requirements
17 5.2.4 Check of physical and geometrical characteristics
5.2.4.1 Procedure
5.2.4.2 Pass/fail criteria
5.2.5 Tightness
5.2.5.1 Positive load signal pressure devices
18 5.2.5.2 Zero load signals pressure devices
5.2.6 Changeover operation – empty to loaded
5.2.6.1 General
5.2.6.2 Positive load signal pressure devices
5.2.6.3 Zero load signal pressure devices
19 5.2.7 Changeover operation – loaded to empty
5.2.7.1 General
5.2.7.2 Positive load signal pressure devices
5.2.7.3 Zero load signal pressure devices
5.2.8 Response time – empty to loaded
5.2.8.1 General
20 5.2.8.2 Procedure – long duration
5.2.8.3 Pass/fail criteria – long duration
5.2.9 Response time – loaded to empty
5.2.9.1 General
5.2.9.2 Procedure – long duration
5.2.9.3 Pass/fail criteria – long duration
5.2.10 Shock and vibration tests
5.2.10.1 Procedure
5.2.10.2 Pass/fail criteria
5.2.11 Operation at extreme temperatures
5.2.11.1 General
21 5.2.11.2 Tightness
6 In-service assessment
22 7 Designation
8 Identification and marking
8.1 Identification
8.2 Changeover plate for the manual empty-loaded changeover device
23 Annex A (informative)Assessment of an empty-loaded changeover device when fitted to a vehicle
A.1 General
A.2 Design acceptance testing set-up
A.3 Static testing
A.3.1 Vehicle requirements
A.3.2 Test procedures
A.3.2.1 Changeover setting of automatic empty-loaded changeover devices
24 A.3.2.2 Effects on brake characteristics
A.4 Running tests
A.4.1 General
A.4.2 Pneumatic empty-loaded changeover device – Air consumption
A.4.2.1 Procedure
A.4.2.2 Pass/fail criteria
25 A.4.3 Pneumatic empty-loaded changeover device – Impact of vibrations on the output signal
A.4.3.1 Procedure
A.4.3.2 Pass/fail criteria
26 Annex B (informative)Examples of manual empty-loaded changeover device handles and changeover plates
28 Annex C (informative)Test bench diagram
29 Annex D (normative)In-service assessment
30 Annex ZA (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2016/797/EU aimed to be covered

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BS EN 15624:2021
$167.15