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| 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. |
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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.
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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. |
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Fill/Pass
Valves
(Pressure 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. |
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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. |
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