Full definition
Sealing system for slurry and mineral-pulp pumps that must resist extreme abrasion and pressures of 2–20 bar. Types: expeller/gland-water seal (clean water injected at pressure dilutes slurry and cools shaft), braided-fibre packing (PTFE/aramid), and mechanical seal with silicon carbide (SiC-SiC) or tungsten carbide faces. Selection depends on pulp type, operating pressure and process-water availability.