Method for determining performance critical dimensions of emergency valve

The invention discloses a method for measuring the performance critical dimension of an emergency valve, and relates to the technical field of railway vehicle emergency valves, and the method mainly decomposes the judgment of original performance critical dimension L into the judgment of dimension of L1 and the judgment of the dimension of L2, thereby simplifying the judgment steps. Meanwhile, andial indicator with the zero scale corresponding to the lower limit of the design size is further arranged, so that implementation personnel can more visually and conveniently judge whether the dimension of L1 and the dimension of L2 meet the requirements or not during measuring. 本发明公开了一种用于测定紧急阀性能关键尺寸的方法，涉及铁路车辆紧急阀技术领域，其主要将原来的性能关键尺寸L的判断，分解成对L1的尺寸的判断，及对L2的尺寸的判断，简化了判断步骤。本发明同时还设置了其零刻度对应于设计尺寸下限的千分表，以使实施人员在测量时，能更为直观、方便的判断L1的尺寸和L2的尺寸是否符合要求。