Welcome to the BURGMANN Sealing World
Media containing solids

Type and properties of media containing solids are factors determining mechanical seal design:

  • Fibrous solids have a tendency to plait and concentrate in tight spaces; the optimum mechanical seal thus has smooth exterior contours in its rotating part and sits in a conical stuffing box (cf. pulp and paper industry).
  • Gritty, mostly hard solids require mechanical seals to have as little empty space as possible on the product side. In base media the most commonly used face material pairing is tungsten carbide/tungsten carbide, in acid media it is silicon carbide/-silicon carbide.

Single mechanical seals with or without quench are the most widespread type up to the limit of pumpability using centrifugal pumps. If the medium is gaseous or polluting, it is generally sealed by double mechanical seals. In this case the model and its arrangement depend mainly on the machine to be sealed.

For typical mechanical seals to seal media containing solids see spring protect sleeve.