TB/T 1492-2017 in English

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Standard No:	TB/T 1492-2017
Document status:	VALID
Title in English:	The test of single car for railway vehicle brake
Title in Chinese:	铁道车辆制动机单车试验
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2017-10-12
Implemented on:	2018-05-01
Superseding:	TB/T 1492-2002 The method of single car for railway passenger car and wagon brake TB/T 2979-2000 Resistance Test for Brake Pipe of Railway Freight Car
Professional Classification:	TB-Railway Transport
Related Keywords:	version test equipment requirements core test requirements acquisition system calibration test items foundation braking test newly ball test passenger car ≤10kpa/truck ≤5kpa brake sensitivity
Related Topics:	motivation iec rail vehicle test vehicle test room bicycle tb/t 3474.1-2017 Railway vehicle brake cylinder execution Rail vehicle brake testing related tb/t 3478-2017 tb/t3192-2017

Introduction

Standard Overview and Technical Evolution

TB/T 1492-2017 replaces the 2002 version of the standard and integrates the content of TB/T 2979-2000. The main technical changes include:

Technical Field	Requirements of the 2002 version	New/Modified Contents of the 2017 Version
Test Equipment	Requirements for Basic Pressure Gauge	Add requirements for pressure transmitter accuracy (grade 0.5) and acquisition system calibration
Test Items	Foundation Braking Test	Newly added special tests for automatic adjustment device for empty and loaded vehicles, 120 valves, and integrated braking devices
Parameter control	Truck leakage ≤10kPa	Tightened to ≤5kPa, unified with the passenger car standard

Typical test process:

Ball test: Use φ20.2mm (passenger car)/φ25.4mm (truck) standard ball to detect pipeline patency
Leakage test: Maintain pressure for 1min, passenger car ≤10kPa/truck ≤5kPa
Brake sensitivity: Braking must be triggered before reducing pressure by 40kPa, GK type local reduction ≤50kPa

Solenoid valve type	Key points for functional verification	Response time
Common brake valve	Stop exhaust when reducing pressure by 170kPa	Instant response
Relief valve (Type 104)	Needs to cooperate with pressure maintaining valve to verify 3-5s stagnation	≤30s complete relief

Case:When the 120/120-1 brake motor stage relief is abnormal, check:

Whether the pad thickness meets the requirements of Table 4 (3-6mm for empty parking space)
Whether the contact gap of the sensing valve is within the range of 3±1mm
Whether the brake pipe length exceeds 24m (special treatment is required)

Key links	Control indicators	Record requirements
Brake regulator test	The travel difference of the passenger car after 4 braking is ≤5mm	The initial/final travel values need to be recorded
Single vehicle tester calibration	Function check before daily work	Keep calibration records

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