low resistance backflow device before and after the two check valves and an automatic drainage device in the middle. Return status when it happens, the two check valves are automatically closed, outfalls automatically open, the middle chamber were choked up with air. After the check valve is leaking, they can be automatic drainage, prevent backflow, strictly prevent backflow pollution, to protect the upstream pipe of the water quality. Characteristics 1 before and after the main valve by the two check valves and an intermediate of automatic discharge device. 2 after the check valve is leaking, they can be automatic drainage, prevent backflow, strictly prevent backflow pollution, to protect the upstream pipe of the water quality. 3 low moisture loss, energy saving effect is significant: the head loss is less than 0. 03Mpa; 4 air partitions, automatic drainage: when the main valve closed, drain valve automatically opens, the middle chamber pressure is zero. The main valve between the upstream and downstream air separation or zero pressure distribution will effectively prevent backflow pollution. Section 5 materials, flexible installation: small volume, light weight, only 30% of the existing products structure length; Can be installed in a horizontal or vertical. 6 in wading product health and safety standards. Before working criterion low water: when the inlet pressure is greater than the outlet pressure, two check valves open, closed drainage pipe. Under 2 m/s velocity, flow loss less than 0. 04Mpa。 Low back off: when the inlet pressure is less than or equal to the outlet pressure, close two check valve and open the drain. If there is no junk clogging, two check valve flap closure, drain discharge, middle room open to the atmosphere, the middle chamber pressure is zero. Low to prevent backflow pollution: when the inlet pressure is less than the outlet pressure, two check valves closed, open drain. If one or two check valve flap and leakage, and leakage of the medium flow in the middle. Cavity through a drain direct discharge valve, in order to prevent the backflow pollution on entry.

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