A wide range of mechanical seals for specialised process applications

Mechanical seals (also known as stuffing boxes) are essential for ensuring your production runs smoothly – whether it involves pumps, piping or other rotating process equipment. You may already be familiar with mechanical seals for equipment from well-known manufacturers such as Johnson, Alfa Laval and Inoxpa. We have put together a wide selection of other mechanical seals, and there is a strong likelihood that we have exactly the solution you need for your installation. 

Our range comprises a selection of different types, covering everything from standard pumping tasks to more demanding operating conditions involving viscous liquids, crystals or limited space around the axle. The focus is on operational reliability, easy installation and materials that can be adapted to the medium, temperature and any hygiene requirements in your production. 

If you would like a more in-depth explanation of the functions and practical use of mechanical seals, you can find out more in our explanatory video. 

Although the mechanical seal is just a single component in the system, it is often one of the key components that determines whether you achieve stable operation. Our mechanical seals are mechanical seals with flat sliding rings, which are held against each other by springs and process pressure, so that the medium forms only a thin lubricating film between the sliding rings and otherwise remains securely inside the system. 

You can choose sliding rings in various materials, including carbon, silicon carbide and tungsten carbide, whilst seats are typically made of ceramic or hard carbides, allowing you to combine low friction with high wear resistance. 

As a secondary seal, we use elastomers such as NBR, EPDM and FKM/Viton in the shape of O-rings or rubber bellows, ensuring the solution is compatible with both the process medium and cleaning agents. Several of the mechanical seals feature protected or external springs and an easy-to-clean geometry, which is well suited to CIP cleaning and plants with high hygiene requirements. 

All mechanical seals essentially perform the same basic function: to provide a seal around the axle. But they do so in their own way: 

• Type 212 is well suited to piping systems, where it handles changing operating conditions, and you can adapt the slide ring and seat materials to both neutral and more demanding media. 
• The BT mechanical seal is ideal for applications where space around the axle is limited – its compact construction with a rubber bellows is particularly suited to smaller pumps and units.  
• The 130 mechanical seal acts as a reliable “workhorse” for general pumping tasks, offering a simple, robust solution with flexible material options for technical and lighter hygienic applications. 
• The 152 HQR is designed for piping systems and handles vibrations and varying loads with its external open spring and rubber cuff. 
• The 600 mechanical seal handles media containing crystals, particles or high viscosity, where the protected springs and O-ring as a secondary seal ensure a long and stable service life. 
• The 101S mechanical seal is designed for pumps and combines an open compression spring and rubber cuff, giving you a reliable seal that is both easy to install and simple to service. 

Based on your operating conditions, you can choose the type that best suits your requirements, whether the most important factors are space constraints, the nature of the medium, cleaning routines or maximum uptime. 

If you work in the food or beverage industry, we can assist with material configurations that meet relevant food contact requirements, and we provide the necessary documentation. Our technical team will advise you on sizing, material selection and replacement strategy, so you end up with a solution that is both technically sound and works in your day-to-day operations. Contact us for a technical review by phone on +45 7020 0422 or via email at inquiry@alfotech.eu. 

Start by looking at the medium, temperature, pressure, speed and equipment type – once you have this information, we can quickly identify a suitable mechanical seal and material combination. 

Yes, many of our mechanical seals can be configured with materials that withstand both CIP chemicals and high temperatures during SIP, provided we have your specific process data. 

Yes, we can provide documentation and certificates for materials that meet the requirements of both the food industry and the pharmaceutical industry. 

If you change the type of medium, temperature or cleaning routines, it may be necessary to upgrade your mechanical seal. We are happy to advise on alternatives that match your new requirements.