Sliding Seals

Sliding seals are highly precise mechanical components designed for sealing rotating shafts in pumps, mixers, and compressors. Unlike packing seals, they operate on the principle of two mutually sliding surfaces (static and rotating parts) that are pressed against each other by means of springs and hydraulic pressure of the medium. A microscopically thin film of liquid is established between the sliding surfaces, providing lubrication and cooling. Sliding seals practically completely prevent medium leakage and are crucial for safe operation at high pressures, peripheral speeds, and when working with aggressive or toxic substances. The choice of materials for sliding rings (e.g., silicon carbide, tungsten carbide, carbon) and secondary seals (EPDM, FKM, PTFE) depends on the chemical and thermal properties of the medium.