The Zhongtie series pinch valves in AFP are divided into Type 1 and Type 2, with identical installation dimensions and interchangeability. AFP-1 is an innovative product with completely independent intellectual property rights specially developed to meet the unified design standards of Chinese trains. Its patent belongs to Shanghai Langvalve Machinery Co., Ltd. Compared with AFP-2 products, AFP-1 products adopt injection molding and embedding technology in structure, which completely eliminates the hidden danger of air leakage between the original assemblies, and at the same time achieves the measured switching times twice the nominal life of German products.