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OPERATOR'S MANUAL
DIRECTIONAL REFERENCES
To avoid confusion, the following directions will be used as a standard throughout the manual:
TOP
The inlet side of the airlock
BOTTOM
The outlet side of the airlock
FRONT
The driven end plate of the airlock
REAR
The non-driven end plate of the
airlock
LEFT
The left-hand side as viewed from
the FRONT of the airlock
RIGHT
The right-hand side as viewed from
the FRONT of the airlock
CCW
The standard counter-clockwise
rotational direction of the rotor
AIRLOCKS IN PNEUMATIC CONVEYING SYSTEMS
Pneumatic conveying systems use air to move materials, Walinga's airlocks are designed for
conveying common agricultural materials, such as cereal grains. The efficient operation
depends on many factors including air flows, line sizes, source power, operating methods, and
suction and discharge line arrangements, among others. Airlocks are used in a variety of
Walinga systems such as in Engineered Transportation Equipment in discharge and transfer
systems, as well as in Agri-Vacs, Central-Vacs, Ultra-Vacs, Ultra-Veyors, Silo-Fillers, and Barge
Unloaders.
A simplified representation of the function of an airlock in a pneumatic conveying system can be
seen in Figure 2-2 through Figure 2-4, showing both the drop-thru and blow-thru models. An
airlock acts as a seal between two sides of a pneumatic conveying system with a pressure
differential.
Product will enter the airlock from the top, either under vacuum or at atmospheric pressure. As
the airlock rotates, in a counter-clockwise direction as a standard, the upward facing pocket will
fill with material. The rotor will continue to rotate, allowing the next pocket to be filled, while
moving the filled pocket towards the bottom of the airlock. The tight clearances between the
blades or blade tips and the airlock casing create the seal between the different pressures of the
two sides of the system.
INTRODUCTION
Figure 2-1: Directional references
00-144472-0 A
2-3
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