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Blow-through rotary valve DBS

Blowpipe!

Blow-through rotary valve DBS

Blow-through rotary valves are used in pneumatic conveying systems to feed bulk materials into pipelines. In this process, the material to be conveyed is introduced into the conveying pipeline via the blow-through rotary valve and entrained by an air stream.

Application area

  • Nominal conveying capacity 0.45 – 320 m³/h at 100% filling level
  • Speed 30 rpm.
  • Differential pressure up to 0.05 MPa
  • Temperature range from -20°C to +80°C
  • Rotor diameter from 100 mm to 630 mm

Material variants

  • 0.6020 (GG)
  • 1.0570 (Steel)
  • 1.4301 (V2A)
  • 1.4571 (V4A)

Type/Features

  • Drive via directly flange-mounted geared engine as DBS COMPACT
  • With free shaft as DBS STANDARD
  • With gland seal packing and external ball bearing as DBS HEAVYDUTY
  • With open cell impeller
  • Sealing with radial shaft seal or stuffing box
  • Housing as welded construction
  • With round or square inlet and outlet
  • Surface primed, painted, blasted, stained or chemically nickel-plated
  • Constructively safe

Variants

  • With wearing strips made of spring steel
  • With wear protection inlet
  • With speed controller
  • With chain drive

Blow-Through Rotary Valve DBS – precision in bulk material handling

A stable differential pressure is the key to any pneumatic conveying system. The DBS blow-through rotary valve from Neue JÄGER maintains constant pressure in its pneumatic conveying line, doses bulk materials with virtually no loss, and adapts flexibly to individual process parameters. The solution for your pneumatic conveying systems within our product portfolio is blow-through rotary valves, which are recognized as a reliable industry standard in the food, chemical, and pharmaceutical industries, as well as in the paint and varnish industry, and for conveying pigments such as marble powder or other ingredients.

How the DBS works: Functionality & operational benefits

The rotating rotor in the housing of our blow-through valve separates the flow above the rotary valve into precisely defined chambers, reduces backflow, and transfers the conveyed medium precisely to the pneumatic conveying line. This minimizes air consumption, minimizes product loss, and ensures virtually wear-free operation for years. Thanks to pressure-shock-resistant housings and precisely mounted shafts, the valve can handle even tough 24/7 shifts, reduces downtime, and significantly lowers its total cost of ownership. Rotary valves with up to 16 chambers and gap dimensions in the 1/10th of a millimeter range enable the use of our blow-through valves even with pressure differences of up to 3.5 bar.
Upon request, your rotary valve can be provided with a tungsten carbide coating, which significantly increases the service life of the blow-through valve, even with abrasive conveyed media, extends operating time, and reduces costs. Tungsten carbide has proven itself as a hard material and is an integral part of modern tools.
We coat the lock pipe, the axial and radial faces of the rotary valve, and, upon request, also the side covers.
Alternatively, we have also proven successful with the bearing covers made of HARDOX.

Facts, figures, and data – Performance and variants at a glance

The DBS series offers a wide range of products – compact, modular, and future-proof:

  • Flow rates from 0.45 to 320 m³/h at 100% filling rate
  • Differential pressures of up to 3.5 MPa to bridge even large pressure differences
  • Temperature ranges from –20°C to +450°C, or even higher upon request
  • Materials from steel 1.0577 to a wide variety of stainless steels such as 1.4301, 1.4571, 1.4408, and 1.4462 for aggressive media, or mild steel with tungsten carbide coatings or HARDOX® 400, 500, or higher for highly abrasive media of all kinds.

Other versions cover higher pressure and temperature ranges. This allows every of our blow-through valves type DBS to be precisely adapted to even sensitive or harsh conveying tasks.

Proven in Practice – Applications from Food to Chemicals

Whether dust-fine powder or free-flowing granules – our blow-through valves have already proven their worth in many industries:

  • For wheat and rye flour in the food industry
  • For granulated sugar, starch, and cocoa in confectionery factories
  • For active ingredients and excipients in pharmaceutical reactors
  • For polyamide and PET granules in compounding lines
  • For cement, lime, or fly ash in the building materials industry

New JÄGER expertise – experience, quality, certificates

Neue JÄGER has been manufacturing rotary valves in Porta Westfalica since 1985 and is now ISO 9001-2015 certified.
An in-house welding shop, modern CNC machinery, and ATEX production monitored by notified bodies within the EU ensure reproducible quality – from the blank to factory acceptance.
The combination of decades of application experience, transparent manufacturing processes, and a high level of vertical integration makes Neue JÄGER a reliable partner for validated production lines in all hygiene and explosion-proof areas.

Get personal advice from our engineering team now

Let our specialists develop a customized DBS configuration for you. Visit us in Porta Westfalica, call +49 571 9720-0, or email us at info@neue-jaeger.de.
Contact us – we’ll get back to you promptly with a customized quote tailored to your specific needs.

Frequently Asked Questions

What is a blow-through valve?
A blow-through valve, also known as a blow-through rotary valve, is used to convey bulk materials in pneumatic conveying systems. Bulk materials are often transported throughout the entire industrial processing process via pneumatic conveying systems.

How does a blow-through valve feed the product?
The rotor of the blow-through valve feeds the product directly into a pneumatic conveying line. This often involves fine-grained or powdery media such as milk powder, starch, or grains, which are processed in the food industry. The rotor of a blow-through rotary valve are always open at the front to allow the product to be transported through the conveying line.

Which rotors are suitable for use in a blow-through valve?
Open rotary rotors without side plates are used in blow-through valves. The conveyed medium is feed directly into the pneumatic conveying line. These rotors have very narrow gaps, both vertically and horizontally, to keep leakage rates low and increase the efficiency of the blow-through valve and the entire pneumatic conveying system.

What alternatives are there to the use of blow-through rotary valves?
As an alternative to blow-through rotary valves, standard rotary valves with a closed rotor can also be used in conjunction with a feed shoe. Neue JÄGER feed shoes are typically equipped with a Venturi nozzle. The narrowing of the cross-section in the feed shoe’s connecting line causes an increase in velocity and thus a pressure drop in the pneumatic conveying line. This pressure drop subsequently leads to very low leak rates and efficient emptying of the individual chambers of the rotary valve.

For which pressure differentials are blow-through valves suitable?
In pneumatic conveying systems, pressure differentials often occur between the pneumatic conveying line and the inlet above the rotary valve. Blow-through rotary valves from Neue JÄGER can be used for pressure differentials of up to 3.5 bar. Rotary valves for medium-pressure or high-pressure blow-through valves have rotors with up to 18 chambers, depending on the pressure differential. The high number of chambers increases the sealing surface between the housing and the rotary valve, allowing pressure differentials of up to 3.5 bar to be bridged.

Neue JÄGER Maschinenbau & You:
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