Ductile iron backflow preventer DF41X-16Q

backflow preventerIt is a kind of hydraulic control combination device that 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 under any working condition, so as to achieve the purpose of avoiding backward flow pollution.

Product Features

The principle of operation of the backflow preventer is to utilize the medium flowing through the inlet water.check valvesWhen the 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 pressure of the upper part of the diaphragm is greater than the relief valve cavity and the spring resistance, the relief valve to maintain the closure of the normal flow of the medium, when the inlet pressure and the pressure difference between the relief valve cavity is less than 0.02Mpa, the medium is in the critical state of reflux, the pressure of the upper part of the relief valve diaphragm Less than the pressure of the drain valve cavity and the spring, the drain valve automatically open, the backflow of media out of the pipe, while a large amount of air into the valve cavity, the formation of air isolation, to stop the media backflow, greater than 0.02Mpa when the drain valve automatically closed.

Product Parameters

Product Size Reference