The APS (Air Pressure Sealing) system ensures that in the closed position, the entire circumference of the seal is uniformly inflated to adapt to the full circumference of the disc. This technique provides a number of advantages in terms of both pressure-tight shut-off and low-friction, material-friendly operation. Several different versions (diameter, speed, density of medium) are available. The customer benefits from a product that is optimally designed for the task at hand thanks to specific feature options relating to the material and drive type. Depending on the sealing material which is selected, the application temperature range extends from -40 to +200 °C. If the medium being transported is expected to reach a temperature of 130 °C or more, for example plastic granules or products and raw materials in the food sector, silicone seals are used.
Rotary solutions with metallic sealing can be supplied for even higher temperatures. Although pressure tightness cannot be ensured here, most granules are unable to pass through due to the small gap size.
Wide range of applications
Wear occurs both at the rotor and in the interior of the butterfly valve seal, especially with abrasive media. Soft-sealing rotary valves are thus a reliable choice in this area because abrasion is partly compensated by the inflatable seal. In fact, material loss is fully compensated up to a certain degree of wear because the highly adaptable cuff still provides reliable sealing. The maintenance and repair intervals are significantly longer than with conventional methods, ensuring greater economy. A further advantage is that the seals are normally interchangeable. The DKZ 103/110 APS rotary valve is ideal for use
in hazardous areas in accordance with the BVS 03 Atex H024 X N6 type examination. Another application for this rotary valve is in vacuum transport systems. Depending on the thickness of the material being transported, the piping is either partly or, in the case of free-flowing products, completely filled. The rotor delivers uniform portions right up to a full flow in the 22° position. The chemical and pharmaceutical industries as well as food processing are just a few of the many potential uses. The intelligent design of the rotary valve allows various relatively small, and therefore energy efficient, drives to be mounted. A distinction is made between (pneumatically operated) 180° pendulum-type drives, which always provide half the capacity of one full revolution of the rotor, and electric drives. Electric drives enable the rotor revolutions to be set precisely to match the dose rate. Thanks to the low installation height and compact design, this rotary valve can also be incorporated into existing systems in a space-saving way, so that refitting or upgrading becomes an attractive option.
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