The large rotor quickly delivers most of the required material, while the small rotor takes over near the target value for controlled final dosing. This makes the Sanitary Double Dosing Butterfly Valve for Powder Discharge particularly suitable for automated weighing, batching, recipe management and powder filling systems in pharmaceutical, food, nutraceutical and chemical production.
The large rotor handles the initial high-volume material discharge. Its purpose is to move powder or granules quickly toward the programmed target, reducing the time required for each dosing cycle.
The large rotor can be configured for 0–90° butterfly-type rotation or 0–180° star-type rotation, depending on the required dosing characteristics.
When the batch approaches the target weight, the control system switches from the large rotor to the small rotor. The smaller opening allows material to be added in finer increments, reducing overfeeding and improving repeatability.
The small rotor operates through 0–180° rotation and is designed specifically for the final precision dosing stage.
The dosing process follows a controlled sequence:
Bulk feeding → Target approach → Fine dosing → Setpoint reached → Automatic closing
The large rotor first transfers material at a high rate. Once the target value is approached, the control system switches to the small rotor. The small rotor then performs the final top-up until the programmed setpoint is reached.
This two-stage approach provides a practical balance between throughput and dosing accuracy, particularly in automated weighing and batching systems.
The Sanitary Double Dosing Butterfly Valve for Powder Discharge can interface with PLC systems, load cells and industrial weighing controls, allowing dosing parameters to be integrated into an automated production process.
This makes it suitable for applications where operators need repeatable ingredient quantities rather than simply opening and closing a conventional discharge valve.
Typical applications include automatic batching, loss-in-weight feeding, powder filling, pharmaceutical ingredient dosing and recipe-controlled production.
The product-contact components are available in 304 or 316L stainless steel, while non-contact components use SS304. Product-contact surfaces can achieve Ra <0.4 μm, helping reduce material retention and simplify cleaning.
The sanitary quick-clamp design allows the valve to be disassembled and reassembled efficiently when cleaning or product changeover is required.
Available sealing options include PTFE, EPDM and Silicone, with configurations selectable according to the material and process requirements.
| Specification | Details |
| Valve Type | Sanitary Double Dosing Butterfly Valve |
| Available Sizes | 6", 8", 10", 12" |
| Working Pressure | -0.1 MPa to +0.5 MPa |
| Working Temperature | -20°C to +135°C |
| Product-Contact Material | SS304 / SS316L |
| Non-Contact Material | SS304 |
| Seal Options | PTFE, EPDM, Silicone |
| Surface Finish | Ra <0.4 μm |
| End Connection | Tri-Clamp, Flange |
| Connection Standards | DIN 11850, BS4825, ISO 1127, ASTM BPE |
| Large Rotor | 0–90° / 0–180° |
| Small Rotor | 0–180° |
| Actuation | Pneumatic Actuator |
The Sanitary Double Dosing Butterfly Valve for Powder Discharge can be used for controlled dosing of pharmaceutical powders and dry ingredients where repeatable batch quantities are important. The 316L stainless-steel product-contact option and hygienic surface finish support GMP-oriented processing environments.
For flour, starch, nutritional ingredients and other dry food materials, the large rotor provides rapid bulk feeding while the small rotor performs final top-up dosing.
The dual-rotor system can be integrated into automated filling equipment where material must reach a programmed weight without excessive overfeeding.
The Sanitary Double Dosing Butterfly Valve for Powder Discharge provides controlled dosing for powders and granular ingredients used in nutritional and supplement manufacturing, supporting recipe-based production and repeatable batch quantities.
For dry chemical powders and granular materials, the two-stage dosing structure helps balance material throughput with controlled final dosing.
| Consideration | AVM Double Dosing Butterfly Valve | Single-Stage Metering Valve |
| Dosing Stages | Coarse + fine dosing | Single-stage |
| High-Speed Feeding | Large rotor | Depends on valve |
| Fine Top-Up | Small rotor | Same opening |
| Batch Control | Designed for automated weighing | More limited |
| Overfeeding Control | Fine rotor helps reduce excess feeding | Depends on control accuracy |
| Automation | PLC/load-cell compatible | Depends on configuration |
| Application | Precision batching and dosing | General material discharge |
A customer integrating powder dosing into an automated weighing line needed to increase feeding speed without sacrificing final batch accuracy. The customer selected the AVM double dosing configuration because the large rotor could handle the bulk of the material quickly while the small rotor completed the final top-up.
During production testing, the customer focused on the transition between coarse and fine dosing because this directly affected batch repeatability. The two-stage structure allowed the customer's control system to switch to fine dosing as the target weight was approached.
A pharmaceutical manufacturer required a hygienic dosing valve for recipe-based ingredient preparation. The customer selected the 316L product-contact configuration with a sanitary surface finish and quick-clamp construction. The main feedback was that the valve combined automated dosing control with a structure that remained practical for cleaning and product changeover.
AVM sanitary valve products are supported by 3-A Sanitary Standards, ISO 9001, CE and FDA compliance across applicable products and requirements.
For pharmaceutical and nutraceutical applications, the double dosing valve can be configured with 316L stainless-steel product-contact surfaces, FDA-compliant sealing materials and hygienic finishes, supporting GMP-oriented production environments.
Relevant material and compliance documentation can be provided according to project requirements.
It is used for controlled and repeatable dosing of powders, granules and other dry bulk materials, particularly where both high feeding speed and accurate final dosing are required.
The large rotor performs coarse dosing, moving material quickly, while the small rotor performs fine dosing near the target value. This staged approach helps balance throughput and dosing accuracy.
Yes. The Sanitary Double Dosing Butterfly Valve for Powder Discharge can interface with PLC controls, load cells and automated weighing systems for programmable dosing and batching.
Yes. The valve can be manufactured with SS316L product-contact components, hygienic surfaces and FDA-compliant seals, making it suitable for GMP-oriented pharmaceutical processing.
Standard sizes include 6", 8", 10" and 12".
PTFE, EPDM and Silicone sealing options are available according to the process conditions and application requirements.
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