Progressive Cavity Dispensing and Spray Valves: Volumetric Precision with RotoStream.
Accurate dispensing volumes. Stable application processes. Low integration effort.
Reliable application of fluids and pastes: Maximum precision even in automated production processes with dynamic motion sequences.
RotoStream is a compact valve platform for the volumetric dispensing and application of low to high-viscosity media in industrial dosing technology. Based on the progressive cavity principle, it offers maximum precision and reproducibility in the application process.
A key performance feature is the speed-proportional control of the volume flow. This ensures that the quantity of media applied per unit of distance remains constant, even with varying path speeds of automated handling systems. In combination with the fully integrated dispensing controller, RotoStream is a compact system solution that can be integrated into industrial production environments with minimal engineering and integration effort.
Stable dispensing volumes despite fluctuating process conditions
In many dispensing processes, the quantity of media discharged is influenced by pressure, valve opening time or medium properties. Changes in viscosity, temperature fluctuations or pressure drops within the fluid system can therefore lead directly to varying dispensing volumes. Volumetric dispensing systems largely decouple the dispensing volume from these influencing factors and create stable conditions for reproducible dispensing processes.
One platform – two application types
RotoStream valve technology is available in two functional versions.
RotoStream Dose!
The specialist for dot and bead dispensing
The RotoStream Dose! volumetric dispensing valve is designed for dot dispensing, continuous bead applications and endless dispensing. Typical applications include bonding, sealing and potting. The focus is on constant volumes, clean bead starts and a defined material break-off.
RotoStream Spray!
The specialist for wide-area applications
The RotoStream Spray! volumetric spray valve is designed for volumetric spraying processes with reproducible spray patterns and defined layer thicknesses. Typical applications include greasing, oiling and functional coatings. The focus is on uniform surface wetting, stable layer thicknesses and a clean spray stop without dripping.
General technical data
| Size | Min. dispensing volume | Volume flow range | Unit |
|---|---|---|---|
| BG1 | 0.003 | 0.003 – 00.36 | cm³; cm³/min |
| BG2 | 0.010 | 0.010 – 01.20 | cm³; cm³/min |
| BG3 | 0.050 | 0.050 – 06.00 | cm³; cm³/min |
| BG4 | 0.140 | 0.140 – 16.00 | cm³; cm³/min |
| BG5 | 0.530 | 0.530 – 60.00 | cm³; cm³/min |
| Feature | Min | Max | Unit |
|---|---|---|---|
| Material inlet pressure | - | 6 | bar |
| Max. media temperature | - | 80 | °C |
| Feature | Min | Max | Unit |
|---|---|---|---|
| Supply voltage | 24 | V DC | |
| Analogue inputs | 0–10 V / 4–20 mA | ||
| Analogue output | 4–20 mA | ||
| I/O channels | 8 channels, freely configurable | ||
| Interface | Ethernet | ||
| Feature | Value | Unit |
|---|---|---|
| Dimensions (L×W×H) | 223–241 × 30 × 57.5 | mm |
| Weight | approx. 500–580 | g |
| Media inlet | G1/8″ (standard) | |
| Media outlet | G1/8″ (standard) | |
| Component | Material | |
|---|---|---|
| Rotor | PEEK or stainless steel, special versions: DLC-coated and passivated | |
| Stator | FFKM, FKM, DLC | |
| Valve body | PEEK or stainless steel | |
| Wetted parts | PEEK, FFKM, FKM, UHMWPE, stainless steel |
| Function | Version | |
|---|---|---|
| Dispensing modes | Dot / Bead / Endless | |
| Suck-back function | Integrated | |
| Parameterisation | Web interface | |
| Status display | LED |
The progressive cavity principle as the basis for volumetric dispensing
At the heart of RotoStream technology is the progressive cavity principle. A metallic rotor rotates eccentrically within an elastic stator. Sealed dispensing chambers are formed between the rotor and stator, moving continuously from the media inlet to the outlet. The medium is mechanically displaced and transported to the valve outlet in defined volumetric increments. The dispensing volume per revolution is fixed by design and is controlled via the rotor speed. This results in a uniform, low-pulsation volume flow that operates largely independently of pressure fluctuations in the fluid system or changes in media properties.
Volumetric dispensing: The progressive cavity principle in detail >
Movement-synchronous dispensing:
Constant material quantity even at variable path speeds
In automated dispensing and spraying processes, the traversing speed of robots or linear axes changes continuously. Acceleration phases, cornering or changes in direction lead to varying path speeds.
RotoStream enables speed-proportional volume flow control. Via analogue input signals, the rotor speed is directly coupled to the traversing speed of the handling system. As a result, the volume flow continuously adapts to the current path speed. The quantity of media per unit of distance remains constant – even during acceleration and deceleration phases.
Dispensing and application – precise in every form
The combination of volumetric dispensing and movement-synchronous volume flow control enables reproducible application processes – from the application of exact individual volumes in the microlitre range to continuous, endless dispensing.
Discrete dispensing dots
In dot dispensing, an exactly defined volume is applied at a specific position. This form of application is used when small quantities of material must be discharged reproducibly and with high positional accuracy. Typical examples include underfill applications in electronics manufacturing or the placement of thermal paste deposits.
Continuous bead application
Bead dispensing is based on a continuous volume flow applied along a defined path. This results in uniform bead geometries with stable material distribution. Typical applications include liquid gaskets, structural bonding applications, or housing and module seals.
Wide-area spray applications
In spray applications, the volumetrically generated media flow is specifically atomised and applied to the component surface as a fine spray. The continuous supply of defined media quantities results in reproducible spray patterns and stable layer thicknesses. Typical applications are found in functional surface treatment.
Integrated dispensing control and compact system architecture:
Reducing complexity. Simplifying integration.
RotoStream reduces engineering and integration effort through a compact system architecture.
Progressive cavity dispensing technology, drive and dispensing controller are fully integrated within the application valve. This allows the valve to be used both as a stand-alone dispensing solution and integrated into new or existing dispensing systems and automated fluid systems.
Volume and volume flow control, signal processing and parameterisation take place directly within the device, significantly reducing the number of external components.
RotoStream – key benefits at a glance
Process-stable dispensing even with fluctuating process conditions
The volumetric dispensing principle creates stable conditions for reproducible dispensing and coating processes. Even with fluctuating process conditions, the applied material quantity remains reliably controllable. Learn more about the decoupling of physical influencing factors.
Constant application geometry at variable robot speeds
The volume flow can be controlled proportionally to the speed of robots or linear axes via analogue input signals. This ensures that bead geometry and layer thickness remain constant, even during acceleration phases, cornering or complex path sequences.
Reduced system complexity thanks to integrated dispensing control
The control of dispensing quantity and volume flow takes place directly within the device. An external dispensing controller is not required. This reduces the number of external components, interfaces and cabling. Potential sources of error are minimised, and integration and commissioning are significantly simplified.
Direct access via standard browser for web-based parameterisation
All relevant parameters can be set via a browser-based user interface. Access is provided directly through a standard browser, so no additional software installation is required. Commissioning, service and system integration can be carried out quickly and without additional IT effort.
Flexibly define quantities volumetrically or gravimetrically
Dispensing and application quantities can be defined as a volume or as a gravimetric target quantity. The system automatically takes the stored media density into account, eliminating the need for manual conversions and allowing media specifications to be implemented directly in line with the process requirements.
Point-of-use functions for operation directly at the valve
An integrated button enables functions such as bleeding, media discharge or service movements directly at the valve. Maintenance and setup work can therefore be carried out quickly without having to access the controller or user interface. An additional status LED indicates the current device status.
Greater process reliability through functional details
The suck-back function
The active suck-back function ensures a clean material break-off after dispensing is complete. By specifically reversing the direction of rotor rotation, the pressure at the outlet is immediately reduced. This creates clearly defined start and end points; stringing and dripping are reliably prevented.
Enclosed media chamber
An integrated liquid seal shields the media-carrying area from the environment and prevents the ingress of air and moisture. This protects the medium from curing and ensures a stable production restart after interruptions.
Media and fields of application
RotoStream is designed for processing a wide range of low to high-viscosity media, including lubricants, adhesives, liquid gaskets and potting compounds, as well as filled and reactive materials. The valves are suitable for industrial production processes where reproducible material applications are required.
Electronics & Electrical Engineering
Underfill applications
Micro-potting
Thermal interface material (TIM) application
Automotive & E-Mobility
Housing seals
Bonding applications
Battery module gaskets
Mechanical Engineering & Precision Mechanics
Precise dispensing dots
Uniform material beads
Assembly and joining processes
Support for your dispensing application
Choosing a suitable dispensing or spray valve depends on several factors – including media properties, application geometry and process dynamics. Our application specialists support you in evaluating your application and finding the appropriate valve configuration. Please contact us via the form or get in touch with our application team directly.