A technology advanced In a variety of material pneumatic conveying system, material rotary valve used to quantitative delivery of material from the silo or feeding device. According to the nature of the delivery of materials, the choice of pellet rotary valve or powder rotary valve. The smooth operation of such valves, transmission efficiency, frequency control can be achieved. Two structural features and technical difficulties Structural features: 1 between the rotor and the body left the best gap, neither the material stuck, but also to ensure the least leakage. 2 The inner surface of the valve body and the surface of the rotor hopper are smooth, minimizing material retention. 3 Rotary valve on both sides of the rotor shaft with blow-off mouth to ensure the normal operation of bearings. 4 with rotor monitoring device for easy automation control. Technical difficulties: 1 According to the characteristics of the pellet or powder conveyed and the specifications of the rotary valve, according to the accumulated experience, the clearance between the rotor and the valve body is reasonably determined. 2 The inner surface of the valve body and the surface of the rotor hopper, especially in the dead ends, are difficult to polish. Three product range of materials Rotary valve for a variety of pellets or powder pneumatic conveying system