The invention relates to a back pressure resistant membrane element, including a water collection pipe and a filter layer arranged on the outer side of the water collection pipe. A waterproof layer is arranged outside the filter layer. The front end of the water collection pipe is closed while the tail end is open, and multiple first through holes are formed on the side wall. A back pressure valve is mounted at the tail end of the water collection pipe. The back pressure valve comprises a cylindrical valve body, inside which a cylindrical water inlet chamber, a functional chamber, a truncated cone-shaped transition chamber and a cylindrical water outlet chamber are arranged in sequence. The functional chamber is equipped with a circular baffle, a round tube and a guide rod matched with the inner cavity of the round tube. By installing the back pressure valve at the water outlet, the element prevents reverse backflow of purified water to the filter layer, avoids delamination and peeling of nanofiltration and reverse osmosis membranes, prevents irreversible membrane damage, significantly extends service life and delivers excellent practical effects.
Area Code: CN
Application Number: CN201810443995.7
