The Vacu-Valve is a low cost alternative to a rotary valve. There are no motors, pneumatics, or moving parts as it operates by using the system vacuum above to seal the sleeve. This is typically from a cyclone, baghouse, or cartridge collector. Since the sleeve is split, gravity will slowly pull the solids down through the sleeve until they exit the sleeve and fall into the collection hopper. As you can see from the description, not all solids will easily pass through this. The ideal particulate would be sand. It’s small, spherical shape and the density allows it to easily pass through the valve. It doesn’t bridge easily.
Choosing the right dust collection solution requires careful evaluation of the specific application.