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BS EN 15625:2021

BS EN 15625:2021

$142.49

Railway applications. Braking. Automatic variable load sensing devices

Published By Publication Date Number of Pages
BSI 2021 30
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This document applies to automatic variable load sensing devices designed to continuously sense the load of a railway vehicle and provide a pneumatic output signal that can be used by a relay valve for the automatic variation of the air pressure used for brake applications, thereby adjusting the brake force accordingly to achieve the required brake performance.

This document specifies the requirements for the design, testing and quality assurance of automatic variable load sensing devices.

The requirements of this document are not fully applicable for tests on vehicle level (vehicle homologation tests).

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
2 Normative references
3 Terms and definitions
9 4 Symbols and abbreviations
5 Design and manufacture
5.1 General
5.2 Functional requirements
5.2.1 Operating requirements
5.2.2 Characteristics of weighing valves
10 5.2.3 Mechanical requirements
5.2.4 Tightness
5.3 Fire behaviour
11 5.4 Shock and vibration
5.5 Service life
5.6 Compressed air quality
5.7 Environmental conditions
5.7.1 General
5.7.2 Ambient temperature
5.7.3 Altitude
12 5.7.4 Humidity
5.7.5 Rain
5.7.6 Snow, ice and hail
5.7.7 Solar radiation
5.7.8 Pollution
13 5.8 External appearance
5.9 Design requirements regarding pressure stress
5.10 Pneumatic connections
6 Type tests
6.1 General
14 6.2 Individual automatic variable load sensing device type tests
6.2.1 Test bench for individual automatic variable load sensing devices type tests
15 6.2.2 Sampling for type test
6.2.3 Test requirements
16 6.2.4 Check of physical and geometrical characteristics
6.2.4.1 Procedure
6.2.4.2 Pass/fail criteria
6.2.5 Tightness
6.2.5.1 General
6.2.5.2 Leakage for F = 0 kN
17 6.2.5.3 Leakage for F = 10 kN
6.2.5.4 Leakage for F = 50 kN
6.2.6 Characteristic, hysteresis
6.2.6.1 Procedure
18 6.2.6.2 Pass/fail criteria
6.2.7 Operation at extreme temperature
6.2.7.1 General
19 6.2.7.2 Leakage for F = 0 kN
6.2.7.3 Leakage for F = 10 kN
6.2.7.4 Leakage for F = 50 kN
6.2.7.5 Characteristic and hysteresis at extreme temperatures
20 6.2.8 Shock and vibration tests
6.2.8.1 Procedure
21 6.2.8.2 Test sequence
6.2.8.3 Pass/fail criteria
7 In-service assessment
8 Designation
9 Identification and marking
23 Annex A (informative)Assessment of an automatic variable load sensing device when fitted to a vehicle
A.1 General
A.2 Design acceptance testing set up
A.3 Running tests
A.3.1 General
A.3.2 Pneumatic automatic variable load sensing device – Air consumption
A.3.2.1 Procedure
A.3.2.2 Pass/fail criteria
24 A.3.3 Automatic variable load sensing device – Output signal variation
A.3.3.1 Procedure
A.3.3.2 Pass/fail criteria
25 Annex B (normative)In-service assessment
26 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 15625:2021
$142.49