Design solution of a mechanical seal where the hydraulic pressure effect in the seal chamber, in relation to the forces closing (pressing) the seal sliding ring faces, is modified through the seal construction. The seal balancing factor “k” is less than one.
Fluid which enters the interior of the gland box into the space between double face mechanical seals to fully separate the pumped liquid from the environment. Barrier liquid pressure is higher than the pressure of the sealed medium (normally by ~ 0.1MPa).
Fluid used as a lubricating or buffer liquid between double face mechanical seals. In this case the liquid is always under pressure lower then the pressure of the pumped liquid.