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通过对倒流防止器产品的起源与历史沿革、各种结构形式和控制方式的介绍,着重对倒流防止器的性能要求、主要功能、结构特点、性能指标、适用场合进行了剖析,分析了倒流防止器产品从低压隔断、阻力大、体积大向空气隔断、低阻力、体积小方向发展的趋势,指出了倒流防止器在设置、安装与使用上存在的主要问题和注意事项,使读者对倒流防止器的内涵、产品和应用有比较全面的了解。
Through the introduction of the origin and history of backflow preventer products, the introduction of various structural forms and control methods, the performance requirements, main functions, structural features, performance indexes and applicable situations of the backflow preventer are analyzed, and the countermeasures of backflow prevention Products from the low voltage cut off, resistance, large volume to the air cut off, low resistance, the trend of small size trends, pointed out the backflow preventer in the installation, installation and use of the main problems and precautions that make the reader to prevent backflow The connotation of products, products and applications have a more comprehensive understanding.