Dead water circle device of fire hydrant

The utility model relates to a dead water circle device of fire hydrant can effectively solve the pollution problem of retained water to the running water. The present invention has the technical scheme that bacteria, including the nozzle stub body and tee bend, two on the nozzle stub component parts of an entirety lateral wall has into water oral siphon and return water oral siphon respectively, the oral siphon of wherein intaking lies in the updrift side of the internal rivers of nozzle stub, the return water oral siphon is located the low reaches direction of the internal rivers of nozzle stub, the oral siphon of intaking is linked together through mouth of first flange and three -way, another antilinear fourth of three -way flange joint ground fire hydrant, another antilinear third flange switch -on return water pipe one end of three -way, the return water pipe other end is adorned on the return water oral siphon through the second flange, the decompression baffle that just is equipped with on the inner w