Progressive Cavity Dosing Valve | RotoStream Dose!

RotoStream Dose!: Progressive cavity dispensing valve with high-resistance material design for demanding media. Speed-synchronous, process-stable and ideal for automation. Available in 5 frame sizes with identical dimensions.

Description Version Size (Flow rate range) Rotor material Stator material Rotary seal Bleed screw Motor size Dosing housing material Option 09 Option 10 Index

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High dosing accuracy and stable bead geometry: RotoStream Dose! is a volumetric dispensing valve designed for the accurate-quantity application of viscous, pasty, and filled media. 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 a constant volume per revolution. The result is a uniform, pulsation-free volumetric flow – independent of pressure and viscosity fluctuations. This makes RotoStream Dose! ideal for dot and bead applications with the most stringent requirements for dosing accuracy and repeatability.

Constant application 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. Even with complex path geometries, the bead remains stable; material accumulation in corners or under-dosing at high speeds are effectively eliminated. 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 clean material break-off at the end of the dosing cycle. By specifically reversing the direction of rotation, the pressure within the material chamber is immediately relieved, minimising dripping and stringing. This results in clearly defined start and end points, even when processing low-viscosity or thixotropic media.

Plug-and-produce via integrated control and software-free configuration: RotoStream Dose! 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. Dosing 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 dosing valve ideally suited for a wide range of low- to high-viscosity media, including reactive materials such as adhesives and sealants. 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.

Build sizes: RotoStream Dose! 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 dosing valve. Firmware updates can be installed independently, enabling continuous optimisation of the valve functions.

Precise volumetric dosing: Highly repeatable dot and bead application based on the proven 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 adjustment of the volumetric flow to the path speed of the handling system to ensure constant medium quantities.

Plug & Produce system architecture: Reduced engineering effort due to a fully integrated dosing control unit – no external controller required.

Process stability during viscosity fluctuations: Mechanical decoupling from pressure and temperature influences for a stable, low-pulsation media flow.