Vacuum Conveying:
The Principle
Examples of Conveyed
Materials
Vacuum Conveying:
Cost Example

Our Conveyor Designs
VR - Vacuum Conveyors
PPC - Vacuum Conveyors
Tablet-Conveyors
Vacuum Conveyors
with Inerting Option
Pressure-Proof
Vacuum Conveyors
Vacuum Conveying
inside Explosion-Zones
Vacuum Conveyors
with Weighing and
Measuring Function
Loading and Unloading
Stations for Vacuum
Conveyors
Suction of Liquids

Applications:
Chemicals
Dye-Powder and Pigments
Pharmaceuticals
Tablets, Capsules and
Dragees
Food

Complete Solutions for the
Handling and Processing
of Powders

Inquiry Form for
Vacuum Conveyors

Pressure-Proof and Pressure-Shock-Proof Vacuum-Conveyors

If products shall be transported by a vacuum conveyor and be transferred directly into areas e.g. like reactors, which withstand positive interior pressure, then the separating container of the Conveyor is designed as a pressure vessel (permissible pressure range: -1 to +6 bar or -1 to +10 bar, different versions according pressure-equipment-directive 97/23/EG available. Container for the connection with standard flanges in diameter 150, 200, 250 and 300 mm available). Also the explosion prevention concept chosen by the operator and individual company-safety-guidelines can make such pressure resistant and/or pressure-shock proof Vacuum Conveyor designs necessary.

In the first step material is sucked into the separator while the pressure-proof discharge element is closed. In the next step, special pressure proof valves close the suction inlet and close the line towards the Vacuum pump. The filter is cleaned by an air-shock, which can be done with inerting gas.

By setting a delay between closing the inlet and shutting off the vacuum pump, the separators volume can be set under vacuum for a further reduction of the Oxygen content. If you give inert gas to the separator for providing the pressure balance to its surrounding, so the whole system can be inerted quite easily. The evacuation of the separator chamber and inerting can be repeated in each cycle for 2-3 times assisting a further Oxygen reduction.

Now the pressure balance between the Conveyor and the unit, which shall be fed, is provided. The Conveyors discharge valve opens and the transported material is transferred directly into the unit to be fed. An additional low-pressure back-blow system helps sticky material to fall out the Vacuum conveyors separator container more easily.

Available in the diameters 150 to 300 mm.

Advantages of these VOLKMANN Conveyors
• well established filter technology
• no product compression inside the conveyor
• easy and reliable discharging
• conveying capacities 100 to 4000 kg/h
• purely pneumatic operated systems
• electrical vacuum pumps upon request
• customized Valves/fitting as specified