... electric control valve with connection to sludge discharge pipe, anti-suction pump can draw out the bottom sludge, the sludge can ... to the PLC, PLC will start electric valve,anti-suction pump connected with connnection pipe,the filter plates on both sides ... filter plate cleaning finished, a full anti-suction precoss is completed. Anti-suction pump will pump out the sludge and transport them by sewage ...