Haiwang WTM series non-pressure three products dense medium cyclone was applied in coal washing and separation since the nineties. Owing to the continuous improvement during the afterward promotion and application, it has been applied in hundreds of coal beneficiation factories. The non-pressured three products dense medium cyclone has various advantages such as non-pressure feeding and so on. Besides that, it washes and separates concentrated coal, middling coal and gangue three products at the same time by using one set of low density suspension, which simplifies the preparation, control, transportation and separation system of one whole set of high-density suspension, saves the capital investment and operation cost , thus getting rapid development.