Progressive Cavity Spray Valve | RotoStream Spray!
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Homogeneous and sharp-edged spray application via the progressive cavity principle: RotoStream Spray! is a volumetric spray valve designed for demanding coating processes that require maximum coating thickness consistency and repeatability. At its core lies progressive cavity technology: a metallic rotor rotates eccentrically within an elastic stator, creating geometrically defined delivery chambers. These chambers transport the medium to the outlet with an exact volume per revolution. The result is a uniform, pulsation-free volumetric flow – independent of pressure or viscosity fluctuations. This provides the foundation for repeatable atomisation and homogeneous surface wetting.
Constant application even at variable speeds: A key performance feature for use in automated applications is the speed-proportional control of the volumetric flow. Via analogue input signals, the rotor speed is coupled directly to the traversing speed of robots or linear axes. The volumetric flow adjusts in real time to the movement of the handling system, ensuring that the quantity of medium per unit of distance remains constant. This achieves a seamlessly uniform coating thickness, even with complex path geometries. This precision is the hallmark of the entire RotoStream series, which was specifically developed for the requirements of highly automated production environments.
The active suck-back function ensures a precise spray cut-off. By briefly reversing the direction of rotation, the pressure within the material chamber is immediately relieved, effectively minimising post-flow or dripping at the nozzle. This ensures the spray pattern remains sharp-edged until the very end.
Plug-and-produce via integrated control and software-free web configuration: RotoStream Spray! features a fully integrated control unit, eliminating the need for external controllers. This minimises interface risks, reduces integration effort, and simplifies commissioning. Parameterisation is carried out directly via the browser-based user interface. Application quantities can be defined either volumetrically or by weight; stored material densities are automatically factored in by the system, removing 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 as well as stainless steel in standard or passivated finishes. This makes the spray valve ideally suited for a wide range of low- to high-viscosity media, including reactive materials. An integrated liquid seal reliably shields the media-carrying area from environmental influences. This prevents the ingress of air or moisture, protects the medium from premature curing and ensures a stable restart after production interruptions.
RotoStream Spray! is fully compatible with proven WALTHER spray technology. This allows for a targeted adjustment of the spray pattern to specific requirements. Through various nozzle and air cap geometries, the spray width and atomisation characteristics can be precisely adjusted – from narrow, focused spray patterns to wide-area applications. Nozzle extensions further expand the range of applications, enabling the coating of hard-to-reach component areas.
Build sizes: RotoStream Spray! is available in five different build sizes, allowing for precise scaling to specific process requirements. The range extends from small-volume applications starting at 0.003 cm³ up to a volumetric flow of 60 cm³/min. As only the internal rotor/stator geometry varies, the external dimensions of the valve remain identical across all variants. This ensures maximum flexibility in process design and reduces engineering effort, as once an integration is established, it remains universally valid for all sizes.
Add-ons and updates: The "Multi-Parameter Sets" software add-on is available to extend the functionality of the RotoStream progressive cavity spray valve. Firmware updates can be installed independently, enabling continuous optimisation of the valve functions.
- Precise, sharp-edged spray application: Excellent coating thickness consistency and repeatability through the volumetric progressive cavity principle.
- Maximum media compatibility: Depending on the configuration, high-quality materials such as PEEK, stainless steel, FFKM or FKM are used – ensuring safe operation even with aggressive media.
- Space-neutral scalability: Five different frame sizes with absolutely identical external dimensions for minimal design adjustments.
- Speed-synchronous automation: Continuous real-time adjustment of the volumetric flow to the path speed of the handling system for seamless, uniform material application.
- Plug & Produce system architecture: Fully integrated dosing control and web-based configuration eliminate the need for external controllers and simplify commissioning.
- Process stability during viscosity fluctuations: Mechanical decoupling from pressure and environmental influences guarantees a stable, pulsation-free media flow and a constant spray pattern.
- Flexible spray geometries: Compatibility with proven WALTHER spray technology allows for the exact definition of the spray application.
- Media inlet: G1/8″ (Standard)
- Media outlet: G1/8″ (Standard)
- Material inlet pressure: 6 [bar]
- Media temperature: max. 80 [°C]
- Supply voltage: 24 [VDC]
- Analogue inputs: 0–10 [V] / 4–20 [mA]
- Analogue output: 4–20 [mA]
- I/O channels: 8 (freely configurable)
- Interface: Ethernet
- Dimensions (L×W×H): 241 × 30 × 57.5 [mm]
- Weight: approx. 580 [g]
