The tank is made by welded steel or stainless steel ,outside of mouth is ultra high strength steel,which used to strengthen tank, in the bottom of cone have deflector, which can make the paper pulp reflux circulating. In the bottom of tank is impurity discharge outlet."D" type hydropulper has changed the way of flow ,make the material contact more quickly with the rotor ,and reduce bearting time greatly,and improve production capacity in the condition of without increasing the power and volume .