
Develops and manufactures rotor-stator machines of the Trigonal® brand for mixing, size reduction and dispersion technology.

Wilhelm Siefer GmbH & Co. KG
Velbert (Bahnhofstr. 114, 42551)New on Amplifa
This is who we are
Wilhelm Siefer GmbH & Co. KG, based in Velbert, develops and manufactures rotor-stator machines under the Trigonal® brand for wet processing of products with low to high viscosity, such as liquid mixtures or solids in liquid. The machines are used for mixing, size reduction, homogenizing, dispersing, emulsifying, deflaking, aerating and other process tasks, among other things in recycling and pulp preparation. The company operates with a high level of in-house production: development and manufacturing are carried out entirely in-house at the German site, supplemented by selected partners in specialized areas. The product range comprises four sizes from SM 180 to SM-D3 as well as the laboratory machine SM 102-28, each in variants with heating/cooling jacket. Since 1978, more than 6,000 machines have been sold; a large proportion of all machines ever produced are still in operation. Services also include process support, spare parts service and technical documentation.
- Site
- Velbert
- Processes
- Mixing (liquid mixtures, solids in liquids), Size reduction (fine & coarse), Homogenizing, Dispersing, Emulsifying, Deflaking, Aerating, Accelerating reactions
- Materials
- Rotor-stator systems, Heating/cooling jacket, Trigonal® SM 180 / SM 180 HK, Trigonal® SM 290 / SM 290 HK, Trigonal® SM-D2, Trigonal® SM-D3 / SM-D3 HK, Trigonal® laboratory machine SM 102-28
- Industries
- Wet processing / processing technology, Recycling, Pulp preparation, Wet processing / processing technology (mixing, size reduction, dispersing,, Industries with low- to high-viscosity products (liquid mixtures,
- 01
Product consulting and product evaluation
- 02
Design of the rotor-stator system
- 03
Development and engineering (CAD)
- 04
In-house manufacturing at the Velbert site
- 05
Assembly and commissioning
- 06
Process support and spare parts service
Materials and processes
Rotor-stator systems
Up to four coaxially arranged tooth rings with variable channel geometry allow optimal adaptation to the medium and process.
Heating/cooling jacket
Machine types SM 180, SM 290 and SM-D3 are available as variants with heating/cooling jacket.
Trigonal® SM 180 / SM 180 HK
Compact machine with throughput of 4–28 m³/h, 6 bar pressure and 7.5–45 kW drive power.
Trigonal® SM 290 / SM 290 HK
Lower speed with powerful drive; throughput 6–120 m³/h, 15–110 kW.
Trigonal® SM-D2
Throughput 15–150 m³/h at 8 bar and 15–160 kW drive power.
Trigonal® SM-D3 / SM-D3 HK
Machine with power reserves; throughput 20–250 m³/h, 8 bar, 90–250 kW.
Trigonal® laboratory machine SM 102-28
Laboratory machine with throughput of 0.006–1 m³/h, 2 bar and 3–11 kW for trials and process development.
Locations

Velbert
DEDevelopment, sales, manufacturing
- Materials
- Rotor-stator systems in various material variants
- Trigonal® SM 180 / SM 180 HK
- Trigonal® SM 290 / SM 290 HK
- Trigonal® SM-D2
- Trigonal® SM-D3 / SM-D3 HK
- Trigonal® laboratory machine SM 102-28
Inside the production

Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Mixing (liquid mixtures, solids in liquids)Engineering | – | – | – | – | – |
| Size reduction (fine & coarse)Engineering | – | – | – | – | – |
| HomogenizingEngineering | – | – | – | – | – |
| DispersingEngineering | – | – | – | – | – |
| EmulsifyingEngineering | – | – | – | – | – |
| DeflakingEngineering | – | – | – | – | – |
| AeratingEngineering | – | – | – | – | – |
| Accelerating reactionsEngineering | – | – | – | – | – |
| PolymerizingEngineering | – | – | – | – | – |
| Shearing under heat application / heating (applying heat, boiling under shear stress)Engineering | – | – | – | – | – |
| De-agglomerationEngineering | – | – | – | – | – |
| Development and manufacturing of mixing and size reduction machines (in-house production, highAssembly | – | – | – | – | – |
5 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Rotor-stator machine (Trigonal®) SM 180 / SM 180 HK | Wilhelm Siefer GmbH & Co. KG SM 180 / SM 180/HK | – | Throughput (water) 4–28 m³/h, pressure 6 bar, drive power 7.5–45 kW, dimensions 965/420/420 mm | – | Velbert |
| Rotor-stator machine (Trigonal®) SM 290 / SM 290 HK | Wilhelm Siefer GmbH & Co. KG SM 290 / SM 290/HK | – | Throughput (water) 6–120 m³/h, pressure 6 bar, drive power 15–110 kW | – | Velbert |
| Rotor-stator machine (Trigonal®) SM-D2 | Wilhelm Siefer GmbH & Co. KG SM-D2 | – | Throughput (water) 15–150 m³/h, pressure 8 bar, drive power 15–160 kW | – | Velbert |
| Rotor-stator machine (Trigonal®) SM-D3 / SM-D3 HK | Wilhelm Siefer GmbH & Co. KG SM-D3 / SM-D3/HK | – | Throughput (water) 20–250 m³/h, pressure 8 bar, drive power 90–250 kW | – | Velbert |
| Laboratory machine (Trigonal®) SM 102-28 | Wilhelm Siefer GmbH & Co. KG SM 102-28 | – | Throughput (water) 0.006–1 m³/h, pressure 2 bar, drive power 3–11 kW | – | Velbert |
Additional services
History
More than 50 years of experience in size reduction and mixing technology
- 1978
Start of machine sales; more than 6,000 machines sold since then
More than 6,000 process plants with Trigonal® technology in operation