Sigle-pillar hydraulic screen changer: Equipped with two working screens, it realized very quick screen changing, enhancing producing efficiency and maintenance Screen changing time is within 2 seconds. It enjoys very good seal effect with double sealing systems of vronze ring and water cooling at the top and bottom of it’s body. The screen is designed with elliptical bore which doubles the filtering quantity, and ensuring high output. Equipped with extremely precise electrical ruler controlling system, it enjoys very smooth and quick changing motion. Hydraulic controlling system ensure secure operation. It works well even under the high temperature of 300°C and high pressure of 25Mpa-30Mpa.