What is a Mechanical Seal and How Does It Work?

A mechanical seal is a device that prevents fluid leakage between a rotating shaft and a stationary housing in pumps, compressors, and mixers. It consists of two main sealing surfaces—one stationary and one rotating—kept in contact by a spring or elastomer. This contact prevents liquid or gas from escaping while allowing the shaft to rotate freely. Mechanical seals are critical in industries like petrochemicals, water treatment, and pharmaceuticals, ensuring efficiency, safety, and environmental compliance. Compared to traditional gland packing, they offer longer service life, reduced energy loss, and lower maintenance costs.