The sieve tray type hydraulic clasifier is also caled the Denver hydraulic classifer, which is used to create interference settlement condiltions with sieveplates. The body shape is a conical box, and the vertical compartment is divided into 4…8 classlfication chambers. The broken area of each chamber is200mm * 200mm. A sieve plate is set at a certain height from the bottom of the chamber.A sieve with 36~72 dlameter of 3.Smm is drlled on the board. The pressure water is fed under the sieve plate and fows upward through the sievehole. The ore particles are suspended above the sieve plate for interference setement and stratification, The coarse particdles are discharged through thecentral hole of the sieve plate, and the discharge quantity is controlled by a conical plug.