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See Chinese contents: QC/T 1172-2022 QC/T 1172-2022: Performance requirements and test methods for vehicle air brake unit exhaust muffler
This document specifies the terms and definitions, performance requirements, test-related requirements, test methods, of the exhaust muffler (hereinafter referred to as muffler), which is used on the vehicle air brake unit. This document is applicable to the use of automobile air brake components (such as: relay valve, brake valve, trailer control valve, air dryer, etc.), which are used on the vehicle air brake unit.
