Double-acting mechanical seal with 30 mm shaft diameter for size 3 homogenisers from Vakumix and NETZSCH Vakumix – suitable for plants with approx. 600 to 1,500 litres batch size and for circulation agitators in pre-phase vessels. Price: EUR 3,039.70 net (EUR 3,617.24 incl. 19% German VAT), plus shipping of EUR 49.95 per seal (insured express, Germany).
Delivery time approx. 1 week (dispatch after 3–7 working days). Sales exclusively to business customers.
Compatible – not an original part: This mechanical seal is a bought-in part from specialised seal manufacturers and fits homogenisers from NETZSCH Vakumix and Vakumix. It is not an original part and this is not an offer from NETZSCH or Vakumix.
Typical applications of the 30 mm seal
The 30 mm mechanical seal belongs to size 3 homogenisers in larger production plants with batch sizes of around 600 to 1,500 litres. At these batch sizes, unplanned downtime is expensive – timely maintenance and an exchange seal pay off particularly well.
- Production plants from 600 to 1,500 litres
- Standard drive of size 3 (reinforced drive: 35 mm)
- Also suitable for circulation agitators with a 30 mm shaft
Technical data
| Feature | Mechanical seal 30 mm |
|---|---|
| Shaft Ø | 30 mm |
| Homogeniser size | Size 3 |
| Batch size of the plant | Approx. 600 to 1,500 litres |
| Design | double-acting |
| Housing | V4A stainless steel |
| Seal rings | 4 × silicon carbide (SiC), alternatively e.g. carbon against chrome cast iron |
| O-rings | FKM, others e.g. EPDM on request |
| Suitable for | Homogenisers from Vakumix and NETZSCH Vakumix, circulation agitators in pre-phase vessels |
| Price | EUR 3,039.70 net · EUR 3,617.24 incl. 19% VAT |
| Delivery | delivery time approx. 1 week, insured express shipping within Germany EUR 49.95 per seal |
Why silicon carbide?
Silicon carbide (SiC) is particularly wear-resistant – even with abrasive raw materials. That is why the standard version uses four SiC seal rings. Other material pairings are possible for special applications.
Replace seal and shaft together
If the mechanical seal is leaking, the shaft should be checked too: with increasing age, imbalance can occur, and the shaft wears in the area of the seal. A new seal on an old shaft lasts much less long. We supply the matching shaft and fit both on request in our workshop in Weyhe or on site at your plant.
Service around your seal
- Damage analysis of every removed seal with a short report
- Testing after repair or fitting, on request with a test report
- Collection by courier and return delivery
- Exchange seal to avoid downtime
Frequently asked questions about the mechanical seal 30 mm
Does the 30 mm seal also fit homogenisers with a reinforced drive?
No. Size 3 homogenisers with a reinforced drive have a 35 mm shaft and need the 35 mm mechanical seal. The actual shaft diameter is always decisive.
How do I know whether my homogeniser has a 30 mm shaft?
The type plate, documentation and a batch size of about 600 to 1,500 litres are indicators. As there are two shaft diameters for size 3, the diameter in the seal area should be measured. Feel free to send us photos.
How can I avoid long downtime on a 1,000-litre plant?
With an exchange seal: we replace the seal, your plant keeps running, and the removed seal is analysed with a short report.
Other sizes
Last updated: October 2026
All trademarks and product names mentioned, in particular Vakumix, NETZSCH, LambdaVita, KappaVita and GammaVita, are the property of their respective owners and are used solely to identify the products offered. This is not an offer from the manufacturer. SEEFRIED Verfahrenstechnik is an independent supplier and is not affiliated with these manufacturers; the mechanical seals offered are compatible spare parts, not original parts.