Material discharge methods

Material typically exits pressure and vacuum pneumatic conveyors via filter receivers or cyclone separators, or discharges directly into process or storage vessels. Positive pressure systems can additionally employ fill/pass valves to discharge material from the system at one use point, or redirect the material to another use point.
Filter Receivers
(Pressure and vacuum systems)
Flexicon filter receivers separate solids from the air stream using filter media and gravity, and are generally specified when materials contain smaller particles that are prone to dusting and/or when dust containment is a primary requirement. They are normally located above material use points, and employ reverse-pulse jet filter cleaning to dislodge accumulated dust from filter surfaces, allowing continuous and efficient separation of material from the air stream.
Cyclone Separators
(Pressure and vacuum systems)
Cyclones separate solids from the conveyor air stream using centrifugal force and gravity, and are typically specified when materials are comprised of larger particle sizes that are not prone to dusting. Although filters are uncommon, they can be incorporated as a secondary means of capturing airborne solids.
Fill/Pass Valves
(Pressure and vacuum systems)
Fill/pass valves are commonly used to discharge material directly into individual or multiple process vessels and/or to deliver it to several destinations along a common conveying line. Downstream of the last fill/pass valve, the conveying line is normally routed to the original material source point or into a dust collection device.
Directly into Process Vessels
(Pressure and vacuum systems)
Both pressure and vacuum systems can feed material directly into blenders, reactors and other enclosed process vessels that are vented to a downstream bag house or other dust collection device, eliminating the need for individual filter receivers.