The function of vacuum receivers is to accept the resin that flows from some source
(silo, surge bin, Gaylord or drying hopper) through the conveying lines - and transfer it into the destination. That destination may be a surge bin, drying hopper, blender or the process machine.
They depend on a central vacuum pump to generate the material flow and central control to regulate the load time.
There are receivers designed mainly for pellets and regrind while others are designed specifically for powders. There are hopper mount and machine mount versions. There are models that require a separate station T valve and other models that have a built in fill valve.
Receivers may range in size from 1/8 through 5 cu.ft. based on design. Depend on your system designer to choose the correct design and size based on your specific application.