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Bulk Bag Unloading Station Configurations

Vacuum Hopper Process - Bulk Bag Unloading Station

BBUS - SoliValve® with Vacuum Hopper

Introducing bulk solids to downstream processing can present a number of challenges; safe operator interface, powder containment, and process efficiency.

The Bulk Bag Unloading Station: SoliValve® with Vacuum Hopper configuration offers the following benefits to address these challenges.

  • Allows materials to be transferred to various receiving vessels in remote locations.
  • Fast change-out between bulk bags.
  • Contained powder handling throughout transfer with SoliValve® and Vacuum Conveyance.
  • Bulk Powder Transfer Rate : 100 kg/min
  • Integrated Weighing and Dosing accuracy: +/-500 g


The SoliValve® 250 overcomes the traditional issues encountered with the 30 years old traditional cone valve. It allows fully automatic and contained handling of big bags, containers, and drums. The SoliValve® 250 doses the material vertically from the storage container, allowing re-closing of partially empty vessels and changing to another ingredient without residual material in the dosing hopper. The SoliValve® 250 can achieve containment levels of less than 100µg/m³ and can reach a dosing accuracy of +/- 20g.

SoliValve 250

Bulk Bag Unloading Station - Vacuum Hopper

Vacuum Hopper

The vacuum hopper conveys the product downstream to the receiving vessel. This occurs in a clean and contained method without any moving parts.

Bulk Bag Unloading Station: SoliValve® with Vacuum Hopper

Transfer Module

HMI Controls

Automated System

Bag Loading Zone

Platform Load Cells

Inline Process Component

Bag Connection and Flow Aid

Floor Mount Frame Structure

Bag Positioning Sensors

Fully Automated System

Tensioning Load Cells

Hoist and Bag Hanger

Bag Connection and Flow Aid Comparison

Transfer Modules Comparison

Transfer Module Comparison Table

Testing Center

Bulk powder handling can be a challenging process and there are many factors that lead to the optimal solution. We can handle the risk for you! Our Testing Center is equipped to test your materials, allowing us to design the best solution for your specific needs. We don’t just sell a product – we sell a solution.

Reach out to your Regional Sales Manager to discuss the testing of your next bulk powder handling project.

Rheo Testing Center

Bulk Bag Unloading Station - Customizable


We will design custom configurations for your specific process. The Rheo design library allows our team to efficiently tailor our products to meet the specific requirements of each application. During the design phase, the Rheo engineering team analyzes the application to develop a custom and comprehensive material handling solution. By using standard options as well as custom-designed features, a GMP operator-centric design can be achieved.

Advanced Features

Bulk Bag Unloading Station - Integrated Weighing

Integrated Weighing

An automatic weighing system can be designed into the Bulk Bag Unloading Station configured as either a gain-in-weight (GIW) or a loss-in-weight (LIW) system. The SoliValve® or a pinch valve will automatically adjust to slow down and stop material flow to hit the target weight and to allow for partial bag unloading.

Bulk Bag Unloading Station - Inline Process Tooling

Inline Process Components

Crushers, mills, or screeners can be easily integrated in-line to help with material flow and to reduce a process step.

Bulk Bag Unloading Station - Spray Ball Device - CIP

CIP Spray Devices

Spray devices can be added to the product contact areas to ensure the system is fully Cleanable in Place (CIP). Our GMP retractable spray device fully retracts out of the product stream during powder transfer to ensure no blockage or retention and only extends during the cleaning process.

Water coverage of the CIP system can be validated (Riboflavin) during a Factory Acceptance Test.

Bulk Bag Unloading Station - Controls and Automation

Controls and Automation

Typical controls for the Bulk Bag Unloading Station include a touchscreen HMI that can be connected to your plantwide network. Simpler control options are also available.

Sensors can be integrated into the system to recognize when product flow has slowed or stopped which can trigger flow aids to turn on or warn the operator to intervene.

Pinch Valve for Bulk Bag Unloading Station

Pinch Valve

Controlling the flow of the bulk powder stream can be a challenge to the unloading process. The pinch valve is often used in conjunction with the spout clamp to control flow. It is designed with high powered cylinders to quickly and reliably cut-off the powder stream, capable of achieving dosing accuracy within +/- 1 kg.

Common Specifications [customized per application]

Load Capacity 2,200 lbs [1,000 kg]
Material of Construction 304 stainless steel frame structure, 316 stainless steel product contact surfaces
Surface Finish Product Contact Area: 25 µin [0.64 µm] Ra with ground and polished welds
Non-Product Contact Area: 35 µin [0.89 µm] Ra with smooth welds as laid
Utility Air Supply: 90 PSIG [6.2 bar], 8 SCFM [3.1 L/s] clean, compressed air
Electric: 120 VAC, 1 Phase, 60 Hz and 480 VAC, 3 Phase, 60 Hz
Pneumatic or Electric (Battery) Utility Options Available
Controls touch-screen HMI with separate E-Stop and on/off switch
Hazardous Rating
configurable for use in Hazardous Locations: Class I Divisions 1 and 2, Class II Divisions 1 and 2, ATEX Zone 2 or Zone 22

Bulk Bag Unloading Station
Bulk Bag Unloading Station
Bulk Bag Unloading Station - Controls and Automation
Bulk Bag Unloading Station
Bulk Bag Unloading Station
Bulk Bag Unloading Station
Bulk Bag Unloading Station
Bulk Bag Unloading Station