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SVL-A, SVL-B, SVL-C, & SVL-D Self-Contained Material Loaders - Venturi Style 20 of 49
Chapter 3: Functional Description
3-1 Operational Summary
Once the control switch(s) is turned on, the SVL loader uses a solid state sensor to
determine if material is needed at the material destination (hopper, bin, sight glass,
etc.) If the sensor “sees” material, the loader will remain in an “at rest” mode with its
solenoid de-energized and no compressed air flowing.
Once the material level drops (typically due to process consuming material) and the
SVL sensor no longer “sees” material, the solenoid is energized, turning on the
supply of compressed air to the venturi. The sensor is in a “closed state” to convey
material and an “open state” to signal a high level condition.
The venturi is located near the material supply and creates a vacuum on its inlet by
the rapid rush of compressed air through it. This vacuum pulls on the material
source and begins a flow of material through the venturi. Once inside the venturi, the
material is then ‘pushed’ by the compressed air through the flex hose, towards the
loader.
Once inside the loader, the compressed conveying air is separated from the
conveyed material by a combination of gravity, and the filter located on top of the
loader. Material and dust will stay inside the filter and conveying air will exhaust
through the filter to atmosphere. Unless the material being conveyed is sticky or wet,
the material will fall away from the filter surface and join other loaded material in the
destination hopper or machine throat.
The compressed air energy of the SVL will remain on and material will flow until the
demand sensor of the SVL once again “sees” material. At this time the sensor will
determine that the material level is satisfied and de-energizes the compressed air
solenoid, stopping compressed air and material flow and returning the system to rest,
until the process calls for more material and starts the cycle again.
Note: The SVL-A unit is designed for clean pelletized material only. The SVL-B and
SVL-C are designed for conveying dust-free plastic granules and regrind
material. Only the SVL-C is capable of conveying two materials.