Elaborated resistivity backflow prevention device backflow prevention performance

Currently on the market there have been some low resistance, energy-efficient new backflow prevention device. As its name with "low resistance", "backflow" This attractive words, but also in the popular and raise doubts and controversy, and continues not broken. The following will explain the dynamic hydraulic control point resistivity  Instrument needle valves  prevention backflow prevention device performance, given prior to analysis and recognition industry consensus standards. Consensus 1: backflow prevention device is defined as "a strictly limited water pressure in the pipeline only one-way flow of hydraulic control combination device." The so-called strict to prevent  Male connector shall include: ① can prevent all conditions occur  Check valve reflux; ② can prevent all conditions occur siphon reflux; ③ outlet end as long as the media back to the inlet side, are called backflow contamination. Consensus 2: backflow prevention device structure is characterized by a two-return unit and drain drainage device component. Therefore, any discharge drainage device does not include backflow prevention devices are not called backflow prevention device.