00In many industries, it is necessary to work with powdered products and the use of secondary fluids to lubricate and/or cool the seals is not allowed. Therefore, a different solution to the conventional ones is needed.
Conventional sealing systems tend to fail quickly due to rapid wear and tear, making Dry Seals an efficient and durable alternative to traditional solutions.
In this article we explain what Dry Seals are in the industry, how they work, in which sectors are they particularly useful and why they can become a key solution to improve the reliability, maintenance and performance of your plant.
Sealing of solid products (powder)
Sectors such as construction (cement, plaster, pigments), food (sugar, olive oil, animal feed) or pharmaceuticals (ascorbic acid powder) often require special sealing solutions.
And while braided packing has traditionally been the most common choice for this type of application, Dry Seals offer better medium to long term wear performance, better shaft protection, less maintenance and therefore reduced wear costs.
Lidering, as a specialist manufacturer of mechanical seals, offers an alternative in cases where sealing systems would require complex auxiliary systems or special abrasion resistant materials: Dry Seals.
What are Dry Seals?
Dry Seals are patented sealing systems, developed specifically for applications where lubrication and product leakage or contamination cannot be tolerated.
Unlike traditional mechanical seals, Dry Seals are sealing systems that do not have lubricated rub faces, thus eliminating one of the main failure points in some sectors. This makes them an ideal solution for applications with:
- Highly abrasive products.
- Powdery or granular fluids.
- Extremely viscous substances.
- Environments that do not tolerate leakage or cross-contamination.
In addition, its compact design with no direct contact between moving parts reduces wear, maintenance and energy consumption.
How do Dry Seals work?
Dry Seals are based on a different technology than conventional mechanical seals. These patented sealing systems have no friction faces that require lubrication or can break down due to vibration. They also do not require a barrier fluid or additional pressurisation to generate pressure with the product fluid, so there is no possibility of product contamination in the event of leakage.
The Dry Seals are equipped with:
- Inner chamber sealed with a high resistance semi-fluid substance.
- Rings made of highly abrasion resistant materials.
- Controlled internal pressure keeps the rings in contact and ensures tightness.
In addition, some models include the bearing in the flange body, further reducing the external elements, simplifying assembly and improving access for maintenance.
Advantages of Dry Seals over other solutions
Other systems for working with powdery fluids are air barriers, but these constantly consume compressed air (to keep the product ‘fluid’ away from the sealing area), which implies high operating costs.
Dry Seals, on the other hand, use a pressurised air line to function properly, but do not need to consume air flow; there is no air flow through the seal and therefore no waste of air.
Lidering Dry Seals prevent the main causes of failure in demanding working environments, increasing system reliability and lifetime, reducing operating costs and providing a clear return on investment in the medium term.
Customised manufacture of seals for solids and expert technical advice
Lidering’s technical team analyses the working environment, product composition, pressure, type of equipment and operating conditions to provide the most appropriate solution.
In addition, we offer a complete service of technical advice, testing, repair and reconditioning of mechanical seals, adapted to the needs of the MRO sector.
Do you need a solution for sealing powder, solids or non-lubricated products?
Contact our Lidering team. We will study your case and propose the most efficient and cost-effective solution in the long term.
