How is the typical cartridge-style mechanical seal for top-entry agitators looks like?

Main Components:

  • Gland: Bolted to the flange to compress the seal assembly
  • Stationary Ring: Fixed, non-rotating part
  • Rotating Ring: Rotates with the shaft
  • Spring: Provides axial closing force
  • O-rings: Multiple seals at shaft sleeve, stationary ring, and gland
                  ↑  Motor / Gearbox Direction
                  │
             ┌────┴────┐
             │ Bearing Housing │
             └────┬────┘
                  │
        ┌─────────┴─────────┐
        │                   │
   ┌────┴────┐         ┌────┴────┐
   │  Gland  │         │  Shaft  │  ← Agitator Shaft
   │         │◄────────┤         │
   └────┬────┘         └────┬────┘
        │                   │
        │   【Mechanical Seal Assembly】   │
        │                   │
   ┌────┴────┐         ┌────┴────┐
   │ Stationary Ring │◄────┤ Rotating Ring │
   │                 │     │               │
   └────┬────┘         └────┬────┘
        │                   │
   ┌────┴────┐         ┌────┴────┐
   │  O-ring │         │  Spring │
   │         │         │         │
   └────┬────┘         └────┬────┘
        │                   │
   ┌────┴──────────────────┴────┐
   │     Mounting Flange (on vessel) │
   └────────────────────────────┘
                  │
                  ↓  Into the tank (impeller side)

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