Homogeneous and sharp-edged spray application thanks to the eccentric screw principle: RotoStream Spray! is a volumetric spray valve for demanding coating processes that require maximum layer thickness consistency and reproducibility. At its core is eccentric screw technology: A metallic spindle rotates eccentrically within a flexible stator, creating geometrically defined metering chambers. These chambers transport the medium to the outlet with a precise volume per revolution. The result is a uniform, pulsation-free flow – independent of pressure or viscosity fluctuations. This provides the basis for reproducible atomization and homogeneous surface wetting.
Constant order even at variable speeds: A key performance feature for use in automated applications is the speed-proportional control of the flow rate. Analog input signals directly couple the spindle speed to the travel speed of robots or linear axes. The flow rate adjusts to the movement of the handling system in real time, ensuring that the amount of medium per unit of travel remains constant. This results in a consistently uniform layer thickness, even with complex path layouts. This precision is the hallmark of the entire system. RotoStream series, which was specifically developed for the requirements of highly automated production environments.
The active retraction function ensures a precise spray stop. By briefly reversing the spindle's direction of rotation, the pressure in the material chamber is immediately released, effectively minimizing overspray or dripping from the nozzle. This ensures a sharply defined spray pattern right to the end.
Plug-and-produce through integrated control and software-free web configuration: RotoStream Spray! features a fully integrated control system, eliminating the need for an external controller. This minimizes interface risks, reduces integration effort, and simplifies commissioning. Parameterization is performed directly via the browser-based user interface. Application quantities can be defined either volumetrically or by weight; stored material densities are automatically taken into account by the system, thus eliminating the need for manual conversions.
Versatile media compatibility: Various materials are available for wetted components such as the housing, rotor, stator, and seals – including PEEK and stainless steel in standard or passivated versions. This makes the spray valve ideally suited for a wide range of low- to high-viscosity media, including reactive materials. An integrated liquid reservoir reliably shields the media-carrying area from environmental influences. This prevents the ingress of air or moisture, protects the medium from premature hardening, and ensures stable restart after production interruptions.
RotoStream Spray! is fully compatible with the proven WALTHER spray technology. This allows for precise adjustment of the spray pattern to specific requirements. Different nozzle and air cap geometries enable defined settings for spray width and atomization characteristics – from narrow, focused spray patterns to wide-area applications. Nozzle extensions This further expands the range of applications and enables the coating of hard-to-reach component areas.
Sizes: RotoStream Spray! is available in five different sizes, allowing for precise scaling to meet specific process requirements. The range extends from small-volume applications starting at 0,003 cm³ to flow rates of up to 60 cm³/min. Since only the internal rotor geometry varies, the valve's external dimensions remain identical across all variants. This ensures maximum flexibility in process design and reduces engineering effort, as a single integration remains universally valid for all sizes.
Add-ons and updates: The "Multi-Parameter Sets" software add-on is available to expand the functionality of the RotoStream progressive cavity spray valve. Firmware updates can be installed automatically, enabling continuous optimization of the valve's functions.
