How does a valve work in a pneumatic transport?

As the name implies, the device offers both a pressure seal and a power supply device. The valve is available in various configurations, all conforming to a basic design consisting of a moving rotor and a stationary housing. The rotor consists of segmented cavities that collect materials from an opening in the housing and release the material into the transport gas stream. The casing is constructed to accept some form of material feed hopper and also a form of transition piece to couple the valve to the transfer pipe. Depending on the construction, the housing can also be equipped with a vent pipe, purge air pipes and a mechanism to adjust the clearance between the blade tips and the housing.