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Water Based Management Drilling Mud System with 2 Screw Pumps. Screen material - stainless steel, best protection against corrosion. The screen is made with high precision and dynamic balance to ensure better balance and easy replacement. The scrapers on the rotor have a hardness of HRC 65 with longer service life. Separate balancing on the scrapers and rotor is carried out for good performance and easy to repair. The Ex-proof standard normally comply with China Standard EXDIIBT4, IEC/ATEX for optio.