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The relay valve is a very critical part of the locomotive brake system, it is the direct control of the air brake signal amplifier output to the actuator. Relay valve reliability, stability and quality performance will directly affect the locomotive brake system reliability, and pose a threat to the safety of rail transport. In order to ensure the safety of locomotive running, it would take on the role of locomotive relay valve function, mechanical properties accurate and comprehensive measurement, thus, the need to develop a comprehensive test system, the relay valve test bench. Its role is to verify the full performance of the relay valve to ensure reliable product quality. This is the whole set of locomotive brake system even driving operational safety is important. Locomotive relay valve as the key components of the braking system, the accurate pressure to the gas path amplified output completed reliable braking, mitigation, holding pressure effect of air characteristics of the relay valve, and its mechanical properties, which requires comprehensive tests . In addition, a very high demand test efficiency of the test bench, test accuracy, the sensor signal acquisition and data processing needs to do the appropriate calculations, the electronic control system to control the pressure of the test rig, the flow sensor circuit by flow sensor and pressure sensor feedback to high response frequency of the data acquisition board, in order to detect the the relay valve output pressure and flow. This thesis, based on the study of the relay valve structure characteristics and the basic working principle, determine the test project and related test procedures, and test system structure based on the working principle of the test equipment design, familiar with the system working process, complete the overall design of the test bench . According to the testing requirements of the test stand design and selection of the hardware part of the test-bed system, so that each part of the entire test system to match, to meet the testing requirements. Then, according to the testing task requirements, prepared using Visual Basic test-bed system software programs, including two test functions and data storage module, dynamic data acquisition, processing, and output, file management and preservation, parameter adjustment, sensor calibration , personnel management, print output function, standardization and automation of the test. Friendly man-machine interface design, test after simple training to skilled to complete all the tests of the relay valve. Finally, the test rig site commissioning, commissioning results prove the rationality and feasibility of the design. The last relay valve test, test rig developed to meet the design requirements is expected to.
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