DVRF - Horizontal Vacuum Dryer


Vacuum drying is the process of drying a powder at low temperature in order to preserve it from thermal degradation. This process is usually time intensive, as heat exchange does not occur under optimal conditions. The DVRF Delta Horizontal Vacuum Dryer is a robust machine designed for achieving the best vacuum drying conditions, thus providing customers with optimal performance.



The design of the DVRF Delta Horizontal Vacuum Dryer is a horizontal cylindrical body with an internal agitator. The machine’s configuration allows for a high working volume/heated surface ratio that leads to higher drying performances.

Compared to other vacuum dryers, the DVRF Delta Horizontal Vacuum Dryer’s main advantages are:

  • Improved drying performance
  • Ability to move the cake during the drying phase at a variable speed, minimizing lump generation
  • High reliability, due to its simplicity


The DVRF Delta Horizontal Vacuum Dryer is a very robust and reliable machine, designed and built by Delta Costruzioni Meccaniche. The main machine elements are:

  • The cylindrical body, which constitutes the machine’s main feature, contributes to the working volume/heated surface ratio and can be certified as a pressure vessel.
  • The flat front door provides easy body access for inspection and maintenance.
  • The agitator, which is located on the welded flat driven end, performs the main dryer operations such as mixing, heating, and discharging.
  • The heating system, installed on all machine surfaces including the agitator, provides high heat transfer coefficients.
  • The discharge valve can be located, depending on needs, on the front door or on the cylindrical vessel.

The agitator is designed to optimize the heat exchange and the efficiency of the mixing function. Moreover, the shape of the blades enables the automatic discharge of the final product.


Delta has developed standard DVRF machine configurations to adhere to the specific production needs for several applications and industries:

  • cGMP and EHEDG, for API production, but also for fine chemicals and fragrances
  • cGMP sterile for sterile API production
  • pilot plant, for small batches for research and development
  • industrial / heavy duty for plastics and precious metals

In addition, Delta offers a wide production range for the DVRF Delta Horizontal Vacuum Dryer:

  • Operating volume: from 10 liters to 10 m3
  • Contact material: AISI316L, AISI904L, C-22, C-276, coated with elastomers
  • Surface finishing: from pickled and passivated to mirror polished
  • Sealing system: from stuffing box to lift off mechanical seal
  • Certification: PED, ASME, HP0, Selo, ATEX


As per the Delta Costruzioni Meccaniche philosophy, each machine can be completely customized to the customer’s needs. The following list of DVRF Delta Horizontal Vacuum Dryer options is only a fraction of the solutions that Delta has developed over the years:

  1. CIP system – for washing between batches, which uses rotating spray balls and sprayers on critical areas of the discharge valve
  2. SIP system – blows steam inside the machine body and checks cold area temperatures for sterilizing grade control
  3. Sanitary insulation – which is mandatory for applications where cleanliness is important, like in white chambers (clean rooms)
  4. Sampling device – for retrieving a product sample and checking the production status
  5. Additional delumper – for products that tends lumps generation
  6. Dust filter on the top head – for product containment while avoiding vacuum pump contamination
  7. High containment devices – for high-potency products, such as a glove box at the discharge nozzle or at the sampling port
  8. External vacuum system coupled with an integrated heating system – for global production line management


The DVRF Delta Horizontal Vacuum Dryer is suitable for multi-product or mono-product applications accomplished in batch process. Due to its robust and reliable design, it can be used in many industries, such as:

  • API production
  • Fine chemicals
  • Dietary supplements/fragrances
  • Chemical Intermediates


The Delta Ultra Dry is a custom system for improving DVRF drying performances. The machine body bottom is equipped with a row of sprayers that blow hot nitrogen. Due to the fluidized bed drying effect, drying times are reduced and lump formation is further reduced.



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