Ductile Iron Backflow Preventer DF41X-16Q

Backflow preventer is a kind of hydraulic control combination device which strictly limits the water in the pipeline to flow in one direction only, and its function is to prevent the medium in the pipeline from flowing backward in any working condition, so as to achieve the purpose of avoiding backflow pollution.

Product Features

Backflow preventer working principle is to use the media flow through the inlet check valve due to mechanical resistance and overflow head loss and decompression, so that the inlet pressure is higher than the pressure of the relief valve cavity, and the pressure of the upper part of the relief valve diaphragm for the inlet pressure, the upper part of the diaphragm pressure is greater than the relief valve cavity and the spring resistance, the relief valve to maintain the closure of the normal flow of the media, when the inlet pressure and the relief valve cavity of the difference between the pressure is less than 0.02Mpa, the media In the critical state of backflow, the pressure on the upper part of the diaphragm of the relief valve is less than the pressure of the relief valve cavity and the spring, the relief valve is automatically opened, the backflow of media out of the pipe, while a large amount of air into the valve cavity, the formation of air isolation, to prevent the media backflow, greater than 0.02Mpa when the relief valve is automatically closed.

Product Parameters

Product Size Reference