Industrial Equipment and Parts Wilhelm Siefer / Siefer Trigonal

Engineering standards and Wilhelm Siefer manufacturing heritage in Germany

German process engineering manufacturer Wilhelm Siefer GmbH & Co. KG has specialized in developing and building high-performance wet mechanical size reduction, homogenization, and dispersing systems for more than five decades under the Siefer Trigonal brand.

Its central production and design facility in Velbert, North Rhine-Westphalia, maintains a high level of vertical integration.

The technological strength of Wilhelm Siefer / Siefer Trigonal centers on mastering complex fluid shear dynamics and multi-phase flow suspensions.

Siefer Trigonal machinery operates reliably across more than 6,000 industrial installations worldwide in chemical processing, bitumen modification, paper recycling, agrochemicals, and food manufacturing.

Colloid mills and inline dispersing machines of SM 180 and SM 290 series

The core production models SM 180 and SM 290 represent continuous inline wet grinding and dispersing machines. The compact SM 180 model equipped with electric motor drives from 7.5 to 45 kW achieves rotor speeds up to 5,400 rpm, delivering steady throughput based on water from 4 to 28 m³/h.

The universal SM 290 series with drive power spanning 15 to 110 kW handles medium to high viscosity suspensions with throughput volumes between 6 and 120 m³/h.

Both machine series feature standard flange configurations conforming to DIN or ANSI dimensions and allow flexible torque transmission via couplings or V-belts.

Heavy-duty wet size reduction units SM-D2 and SM-D3 for severe services

For large-tonnage modified bitumen production, asphalt emulsions, pulp recovery, and recycling operations, Wilhelm Siefer manufactures heavy-duty models SM-D2 and SM-D3.

The SM-D3 production model integrates high-power electric drives from 90 to 250 kW and generates discharge operating pressures up to 8 bar.

Large connection flanges measuring DIN/ANSI 150 enable the SM-D3 unit to process coarse solid raw material pieces measuring up to Ø 100 mm without jamming risks.

The massive machine structure weighing approximately one ton effectively dampens dynamic process vibrations during round-the-clock heavy industrial operation.

Coaxial rotor-stator tool rings and replaceable Trigonal cutting knives

The core mechanical component of Wilhelm Siefer machines is the patented Trigonal rotor-stator configuration consisting of up to four coaxially positioned rigid and movable rings.

As the rotor turns at high peripheral speed, process fluids pass through sequential tooth crowns, channels, and precision cutting edges.

A combination of high hydrodynamic shear forces, pressure pulsations, and cavitation effects reduces particle dimensions to sub-micron fineness in a single continuous pass.

Replaceable cutting tool inserts and knife combs are machined from wear-resistant alloy steels and allow multiple resharpening cycles.

Cartridge mechanical shaft seals and heavy-duty bearing carrier modules

Secure shaft containment at high internal casing pressures and high rotational speeds is ensured by robust cartridge mechanical shaft seals. The factory pre-assembled cartridge format eliminates assembly alignment errors and axial runout during on-site installation.

Silicon carbide and tungsten carbide sliding seal faces preserve leak-free integrity when pumping abrasive slurries or corrosive chemical mixtures. For polymerizing or crystallizing process fluids, built-in barrier fluid flushing ports support connection to external seal circulation loops.

Thermal control in HK jackets and binary inlet multi-stream mixing systems

Machine configurations featuring the HK designation include heating or cooling jackets around the milling chamber, providing precise thermal regulation for temperature-sensitive polymers, hot melts, and bitumen mixtures.

The binary inlet manifold attaches directly upstream of the milling chamber to keep separate liquid streams isolated until they meet precisely at the high-shear mixing gap. This prevents premature chemical reaction or precipitation along inlet nozzles, ensuring high operational uptime.