Double-acting mechanical seal with 45 mm shaft diameter for size 4 homogenisers from Vakumix and NETZSCH Vakumix – suitable for plants with approx. 2,000 to 7,000 litres batch size and for circulation agitators in pre-phase vessels. Price: EUR 4,079.93 net (EUR 4,855.12 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 45 mm seal
The largest standard seal with a 45 mm shaft Ø belongs to size 4 homogenisers in large plants with batch sizes of around 2,000 to 7,000 litres. Every hour of downtime counts here – which is why an exchange seal, courier collection and a planned seal replacement make particular sense for this size.
- Large plants from 2,000 to 7,000 litres
- Plannable seal replacement during the maintenance window
- Also suitable for circulation agitators with a 45 mm shaft
Technical data
| Feature | Mechanical seal 45 mm |
|---|---|
| Shaft Ø | 45 mm |
| Homogeniser size | Size 4 |
| Batch size of the plant | Approx. 2,000 to 7,000 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 4,079.93 net · EUR 4,855.12 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 45 mm
How do I know whether my homogeniser has a 45 mm shaft?
Size 4 homogenisers in plants of about 2,000 to 7,000 litres have a 45 mm shaft. To be sure, measure the shaft diameter in the seal area or send us photos and type plate data.
How can the seal replacement on a large plant be planned?
Ideally during the regular maintenance window: we agree the date, exchange seal and, if necessary, a new shaft in advance so that the plant is down only briefly.
Do I get a test report after the replacement?
Yes, on request. After repair or fitting, we test the mechanical seal and document the result in a test 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.