Gravity-loaded GF Series conveyors from Cyclonaire Corp. offer high-capacity semi-dense phase pneumatic conveying for abrasive, powder or granular materials. They have a conveying capacity of more than 100 tons per hour, depending on the model and application. The conveyors can be used for unloading silos, bulk bags, and IBC's to in-plant transfer. Units use medium-pressure blower air to convey material at intermediate line velocities and high material-to-air ratios. As the load cycle begins, the HV valve directs blower air through the convey line. Material flows via gravity into the transfer vessel where an electronic level control regulates filling of the unit. Should material flow be interrupted, a back-up timer resumes operation. Cycling between loading the transfer vessel and unloading is automatic. Once a high-level control senses that the transfer vessel is full, the HV valves automatically switch to direct blower air into the tank. This positive air pressure pushes the material into the discharge manifold. There, it is fluidized for semi-dense conveying and transferred to its destination. Carbon-steel transfer vessels are standard; however, stainless-steel and epoxy-coated models are available. Cyclonaire Corp.