Rotary valve. How rotary valve works in industry. Rotary lock. Mazda Brings The Rotary Engine again.

Rotary valves are referred to by various names. The most common ones are rotary airlock and rotary feeders. The application of the valve gives rise to its name, whether a feeder, an airlock or even both. The term 'rotary valve' will be our focus for this article.
A rotary valve is simply a mechanical device used for the continuous discharge of bulk solid materials. The term ‘rotary’ is derived from the valve’s operating principle. During bulk material handling, the valve’s vanes rotate to produce a successful operation, hence, the term ‘rotary’. The valve is an essential component in the bulk handling industry. Its main functions are to (i) regulate bulk material flow in the system and (ii) prevent air leakages, hence, maintaining constant air pressure in the system. The rotary valve has two ports, the inlet port which serves as the bulk material entry point and the outlet port which serves as the bulk material exit point. During operation, the bulk material goes in via the valve’s inlet and is transported across the valve’s housing surface to the outlet by means of the rotor pockets as the rotor shaft rotates. There are two types of rotations namely, the load side rotation and the return side rotation. The former is considered to be the rotation of the vanes and the pockets from the entry point to the exit point, while the latter is the rotation of the vanes and the pockets from the outlet to the inlet. Regardless of the valve’s simple construction, it is adjustable to meet most industrial applications. An incorrectly used valve can lead to inadequate efficiency, equipment wear, accelerated product degradation, production loss because of process shutdowns etc.
Polimak offers an excellent variety of rotary valves to assist our customers with the efficient handling of bulk solid materials. We aim at designing and manufacture state-of-the-art rotary valves targeted at providing quality performance during bulk material handling. We provide valves that operate in industries such as food, chemical, agriculture, foundry, mining and aggregate and many others. Some of the bulk materials which are handled by our valves include cement, calcite, ash, glass powder, marble powder, plastic pellets, sawdust, fly ash, coal, coal dust, wheat, flour, barley, feed, seed, corn, chickpea, bean, soybean, sesame, rice, rice flour, dried fruit, nuts, peanut, almond, sunflower seed, cottonseed, grain cereals, chestnut, coffee grain, coffee powder, sugar, salt, spice etc.
From Mazda:
"With the discontinuation of the RX-8, Mazda ended mass-production of the rotary engine in June 2012. Today, some 10 years later, the rotary engine is making a comeback. This new rotary engine has been adapted to meet the needs of our times and is now being used to generate power rather than as a drive unit.
While the 13B Renesis engine used on the RX-8 was a 654 cm3 two-rotor engine, the MX-30 e-Skyactiv R-EV uses an 830 cm3 single rotor format for the rotary engine generator. With a 120 mm generating radius (R) and 76 mm rotor width, its compact size enables coaxial placement and integration with the electric motor, decelerator and generator to achieve a unit with an overall width of less than 840 mm that fits on the same body frame as the MX-30 BEV. We also successfully reduced the weight of the engine by over 15 kg by using aluminium for the side housing section of the engine structure instead of the iron used on the Renesis engine.
The main contributor to increasing fuel economy and reducing emissions on the MX-30 e-Skyactiv R-EV rotary engine was the use of direct fuel injection. When fuel is injected into the ports on a conventional rotary engine, a lot of the air-fuel mixture ends up at the back of the combustion chamber, not fully combusting and eventually being expelled as unburned gas. This has a negative effect on both fuel economy and engine output.
The rotary engine on the MX-30 e-Skyactiv R-EV uses direct fuel injection, making it possible to distribute the air-fuel mixture to the main combustion area and achieve more efficient combustion. Additionally, direct fuel injection atomises the fuel at the time of injection making it possible to sufficiently vaporise fuel even at lower temperatures. This also helps prevent the injection of excess fuel.
The engine also adopts an exhaust gas recirculation (EGR) system to improve fuel efficiency. Adding an EGR system that operates mostly at low rpm and low loads improves fuel economy by preventing cooling loss caused by rotary engine combustion chambers having a greater surface area than those of a reciprocating engine.

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Interestig how on that amount of dust, the motor's still runnig.